Knowledge (XXG)

June Gloom

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1029: 1162:. These clouds have been found to be present more often than expected in common stratocumulus layers. These clouds are persistent year-round off the coast, but are only drawn inland during June Gloom events and related phenomena elsewhere in the world. Observations suggest that when marine stratus is present alone, drizzle is minimized. However, scientists believe that the presence of actinoform clouds within the marine stratus is indicative of an increase in drizzle and the onset of precipitation. Observation and computer modeling have shown that the shape of the cloud fields actually rearrange themselves when the clouds start to rain. 40: 1143: 1059:, which flows out of the cold Gulf of Alaska, enhances the contrast between the cool air below the inversion layer and the warm air above it. A stronger inversion layer – one with a greater difference in temperature between the air above and the air below – often results in more and deeper marine layer clouds that persist longer into the day. Upwelling of colder-than-normal ocean water, associated with a 114: 1040:. When the relative humidity reaches 100%, the water vapor condenses into liquid water droplets and the clouds begin to form. The stable top of the marine layer, a result of the temperature inversion, prevents any dry, warm air from above the inversion from mixing with the stratus deck. This confines the stratus deck to a relatively narrow vertical band in the atmosphere, allowing it to strengthen. 1013: 1021: 153:, move in at night, usually after midnight, and typically dissipate in the late morning, giving way to clear, sunny skies. During a heavy June Gloom season, the condition may persist into the afternoon, or even all day during an exceptionally strong event. Often, the air is saturated with moisture, and 1070:
the clouds over the coastal lands. The extent of inland advection is limited by southern California's coastal mountain ranges. The winds will continue to push the cloud layer onshore until they encounter mountains at or above the altitude of the clouds themselves, with the mountains then preventing
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The low-altitude stratus clouds that make up the June Gloom cloud layer form over the nearby ocean, and are transported over the coastal areas by the region's prevailing westerly winds. The sheet-like stratus clouds are almost uniformly horizontal, covering large areas but having relatively shallow
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The negative effects of a long June Gloom on the coastal California tourism industry is often reported in the local news media. The phenomenon can be especially disorienting to visitors from inland areas who, coming from the summer heat, would not expect cool temperatures and clouds and fog at the
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The marine layer clouds of a June Gloom day usually are at their maximum at dawn, when the surface air is at a minimum temperature and the temperature difference in the inversion layer is at its maximum. The air beneath the inversion base being at its coolest also makes it likely that it will be
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Satellite image of a strong June Gloom day, showing marine layer clouds covering the coastal regions of the counties of Santa Barbara, Ventura, Los Angeles, Orange, and San Diego. The San Fernando Valley and San Gabriel Valley also are covered, with clouds spilling inland as far eastward as San
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is in place over the region, and the marine layer will be very weak or nonexistent when there is a strong high-pressure system affecting southern California. The National Weather Service graphic on the right explains the effects of atmospheric conditions upon the marine layer and local weather
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By late morning to early afternoon, solar heating usually is sufficient to evaporate the clouds, and the sun emerges. The phenomenon forms earliest and lasts longest at the coast, with weaker effects as it moves further inland. When the marine layer is strong and deep, clouds can fill the
1082:, which is caused by the temperature and pressure difference between warm areas inland and the cool air over the ocean, often develops on warm summer days as well, increasing the on-shore flow pattern and maintaining a constant flow of marine stratus clouds onto the coastal areas. 225:
The months of May and June are typically the cloudiest months of the year in coastal southern California, having only 59% and 58% sunny days, respectively, on average in San Diego. The number of days in May and June that are "gloomy" varies from year to year. Anomalies in
105:. This weather pattern is relatively rare, and occurs only in a few other parts of the world where climates and conditions are similar. Scientists study the cloud fields that make up June Gloom to increase understanding of cloud behavior at the onset of precipitation. 1233:
and from November 1871 to June 1939 and a variety of buildings at downtown, and at San Diego Int'l (Lindbergh Field) since July 1939. Temperature records, however, only date from October 1874. For more information on data coverage, see
992:, although this is not well-supported by evidence. However, the normally-very-sunny Los Angeles climate also is home to people who thrive during the brief seasonal respite the gloom provides from the unending sunshine and clear skies. 1036:
depth of 500 to 2,000 metres (1,600 to 6,600 ft). These clouds begin to form when wind mixes moisture from the ocean surface into the air. The air cools and expands as it is mixed and moves upward, and this cooling increases the
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A combination of atmospheric and oceanic conditions must be just right in order for June Gloom to form, and these conditions usually align only around May and June of each year. These include the marine layer effect common to the
1051:-pressure system (which is strongest during the summer) meets with the rising, cooling air from the sea surface, producing a very stable layer of air that caps the cool air from rising any further. The strength of this 1071:
any further inland progress of the marine layer. The foothill regions of these mountains experience some of the thickest fog and drizzle, as they are essentially in the clouds at this point.
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and plunge into a cloudy, fog-filled Los Angeles. On a weak June Gloom morning, the clouds and fog may only be present within a mile or two of the coastline, affecting only the beach cities.
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clouds covering the coast of southern California, extending a varying distance inland depending on the strength of the June Gloom effect that day. On a strong June Gloom day, the clouds and
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on exceptionally strong June Gloom mornings. If conditions are not as strong, the Basin may be filled while the valleys may be clear. It is not uncommon for motorists to drive over the
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Researchers have discovered that the cloud fields forming June Gloom and related phenomena from other west-coast marine-influenced climates are excellent places to find and study
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Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1981 to 2010.
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skies with cool temperatures during the late spring and early summer. While it is most common in the month of June, it can occur in surrounding months, giving rise to other
1516: 1471: 1420: 1559: 97:, and gives way to sunny skies. May and June together are usually the cloudiest months in coastal California. June Gloom is stronger in years associated with a 1729: 1467: 1114:
clouds, other locations matching the daily and seasonal effects of Southern California's June Gloom are relatively rare. These include the western coast of
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passing over southern California will produce the deepest and most extensive June Gloom marine layer. The marine layer effect is weakened when a weak
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can be used to forecast the length and intensity of the June Gloom phenomenon in a given season. Years with warmer ocean temperatures, referred to as
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Official precipitation records for San Diego were kept at the Weather Bureau Office in downtown from October 1850 to December 1859 at the
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affects the strength of the marine layer, and how long it will take the clouds to dissipate. Additionally, the cool ocean water of the
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A weak, shallow layer of clouds hovering over the coast of California, typical of the dissipation of the marine layer later in the day.
255: 165:. Fog and drizzle normally are found near the furthest inland extent of the gloom, where the cloud deck is closest to the ground. 89:, though usually not rain. June Gloom usually clears up between mid-morning and early afternoon, depending on the strength of the 1016:
A very well-formed and distinct Catalina eddy directly west of San Diego. The marine layer clouds over the land have dissipated.
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is crucial to the formation of the marine stratus that produce June Gloom. Compression and warming of air sinking out of the
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for the months of May and June, which are the two months when the June Gloom pattern is the strongest.
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of southern California. It's not uncommon for the layer to persist into the mid-afternoon or evening.
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June Gloom has been reported by some Californians to bring on symptoms consistent with
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California Nevada Applications Program/California Climate Change Center.
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A long June Gloom season, extending late into the summer, is known as
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In the early 20th century, this phenomenon was sometimes known as the
1171: 1147: 1141: 1027: 1019: 1011: 112: 38: 1444:. National Oceanic and Atmospheric Administration. Archived from 1066:
Once this marine layer has formed, the prevailing westerly winds
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History of weather observations San Diego, California 1849–1948
1369:"Why does 'June Gloom' typically come only this time of year?" 154: 82: 1661: 1659: 1560:"San Diego/Lindbergh Field CA Climate Normals 1961–1990" 1102:
While many parts of the world commonly have an offshore
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Victoria Clayton, Special to The Times (May 28, 2007).
1579: 1577: 1616:"For some, too much sunshine may bring on the blues" 1540:. National Oceanic & Atmospheric Administration 981:Source: NOAA (sun and relative humidity 1961–1990) 214:caused by subsidence of high-pressure air from the 1329: 1327: 241:The climate charts below show a clear drop in the 1562:. National Oceanic and Atmospheric Administration 1375:. Southern California Public Radio. June 11, 2014 134:, penetrate far inland down valleys such as the 126:A typical June Gloom morning consists of marine 1517:National Oceanic and Atmospheric Administration 1472:National Oceanic and Atmospheric Administration 1421:National Oceanic and Atmospheric Administration 1442:"Station Name: CA LOS ANGELES DWTN USC CAMPUS" 1295: 1293: 1291: 1289: 101:, and weaker or nonexistent in years with an 8: 1075:saturated with a relative humidity of 100%. 262:), 1981–2010 normals, extremes 1877–present 81:The overcast skies often are accompanied by 628:(1981–2010 normals, extremes 1874–present) 58:term for a weather pattern that results in 1538:"Station Name: CA San Diego Lindbergh FLD" 93:and the distance of the location from the 157:also develops, along with frequent light 1138:Actinoform clouds and drizzle prediction 1063:, can strengthen this effect even more. 622: 252: 132:fog may cover the San Francisco Bay Area 27:Weather phenomenon in coastal California 1250: 1213: 238:, usually foretell a more gray period. 1363: 1361: 1359: 1098:Similar weather elsewhere in the world 1642:"Voyager: Can May Gray be Predicted?" 1394:San Diego Union Tribune, June 8, 2004 1267:Scripps Institution of Oceanography. 7: 1666:Amanda Leigh Haag (August 9, 2005). 1513:"NowData – NOAA Online Weather Data" 1468:"LOS ANGELES/WBO CA Climate Normals" 1417:"NowData – NOAA Online Weather Data" 1405:San Diego Union Tribune, May 7, 2010 149:The clouds, which are formed by the 43:June Gloom conditions prevailing at 1730:Weather events in the United States 1644:. Scripps Institute of Oceanography 1336:"NWS Jet Stream – The Marine Layer" 1306:University of California, San Diego 1273:Scripps Institution of Oceanography 25: 1668:"Cloudy With a Chance of Drizzle" 32:For the Camila Cabello song, see 1302:"California May Grey/June Gloom" 1146:Actinoform clouds imaged by the 74:form over the cool water of the 208:West Coast of the United States 254:Climate data for Los Angeles ( 222:local to southern California. 1: 817:Average rainfall inches (mm) 615:Source: NOAA (sun 1961–1977) 451:Average rainfall inches (mm) 1593:San Diego Magazine – Journal 1094:conditions in more detail. 990:seasonal affective disorder 747:Mean daily minimum °F (°C) 677:Mean daily maximum °F (°C) 381:Mean daily minimum °F (°C) 311:Mean daily maximum °F (°C) 243:mean monthly sunshine hours 122:is visible near the center. 47:in late morning, June 2013. 1746: 1640:Mark M. (April 30, 2014). 1334:National Weather Service. 1269:"Marine Layer Information" 980: 614: 181:, even extending into the 31: 933: 886: 816: 746: 676: 671: 668: 665: 662: 659: 656: 653: 650: 647: 644: 641: 638: 635: 632: 567: 520: 450: 380: 310: 305: 302: 299: 296: 293: 290: 287: 284: 281: 278: 275: 272: 269: 266: 247:percent possible sunshine 1343:National Weather Service 1150:instrument on board the 1122:, the western coasts of 173:and spill over into the 1187:Inversion (meteorology) 626:San Diego Int'l Airport 228:sea surface temperature 1673:NASA Earth Observatory 1177:Climate of Los Angeles 1155: 1032: 1025: 1017: 193:from the clear, sunny 123: 48: 1715:Climate of California 1498:May 25, 2017, at the 1145: 1031: 1023: 1015: 142:, or extend into the 116: 42: 1595:. San Diego Magazine 1192:Marine stratocumulus 1182:Climate of San Diego 1134:in southern Africa. 1120:Macaronesian Islands 1091:high pressure system 1053:subsidence inversion 183:Santa Clarita Valley 1725:Southern California 1087:low pressure system 629: 263: 195:San Fernando Valley 175:San Fernando Valley 56:Southern California 1156: 1057:California Current 1049:North Pacific High 1033: 1026: 1018: 623: 253: 179:San Gabriel Valley 140:central California 124: 76:California Current 49: 1620:Los Angeles Times 1231:Mission San Diego 1197:San Francisco fog 1160:actinoform clouds 1038:relative humidity 985: 984: 936:possible sunshine 624:Climate data for 619: 618: 570:possible sunshine 216:subtropical ridge 210:, an atmospheric 171:Los Angeles Basin 34:June Gloom (song) 16:(Redirected from 1737: 1689: 1688: 1686: 1684: 1663: 1654: 1653: 1651: 1649: 1637: 1631: 1630: 1628: 1626: 1611: 1605: 1604: 1602: 1600: 1581: 1572: 1571: 1569: 1567: 1556: 1550: 1549: 1547: 1545: 1534: 1528: 1527: 1525: 1523: 1509: 1503: 1489: 1483: 1482: 1480: 1478: 1464: 1458: 1457: 1455: 1453: 1438: 1432: 1431: 1429: 1427: 1413: 1407: 1402: 1396: 1391: 1385: 1384: 1382: 1380: 1365: 1354: 1353: 1351: 1349: 1331: 1322: 1321: 1319: 1317: 1312:on June 13, 2010 1308:. 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A 110: 107: 72:stratus clouds 68:colloquialisms 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 1742: 1731: 1728: 1726: 1723: 1721: 1718: 1716: 1713: 1711: 1708: 1706: 1703: 1702: 1700: 1679: 1675: 1674: 1669: 1662: 1660: 1656: 1643: 1636: 1633: 1625:September 13, 1621: 1617: 1610: 1607: 1594: 1590: 1587:(June 2007). 1586: 1580: 1578: 1574: 1561: 1555: 1552: 1539: 1533: 1530: 1518: 1514: 1508: 1505: 1501: 1497: 1494: 1488: 1485: 1473: 1469: 1463: 1460: 1447: 1443: 1437: 1434: 1422: 1418: 1412: 1409: 1406: 1401: 1398: 1395: 1390: 1387: 1374: 1370: 1364: 1362: 1360: 1356: 1348:September 13, 1344: 1341: 1337: 1330: 1328: 1324: 1311: 1307: 1303: 1296: 1294: 1292: 1290: 1286: 1274: 1270: 1263: 1261: 1259: 1257: 1255: 1251: 1244: 1237: 1232: 1226: 1223: 1217: 1214: 1207: 1203: 1200: 1198: 1195: 1193: 1190: 1188: 1185: 1183: 1180: 1178: 1175: 1173: 1170: 1169: 1165: 1163: 1161: 1153: 1149: 1144: 1137: 1135: 1133: 1129: 1125: 1121: 1117: 1113: 1112:stratocumulus 1109: 1105: 1097: 1095: 1092: 1088: 1083: 1081: 1076: 1072: 1069: 1064: 1062: 1058: 1054: 1050: 1046: 1041: 1039: 1030: 1022: 1014: 1007: 1005: 1002: 998: 993: 991: 979: 975: 972: 969: 966: 963: 960: 957: 954: 951: 948: 945: 942: 939: 937: 932: 928: 925: 922: 919: 916: 913: 910: 907: 904: 901: 898: 895: 892: 890: 887:Mean monthly 885: 879: 874: 869: 864: 859: 854: 849: 844: 839: 834: 829: 824: 819: 815: 809: 804: 799: 794: 789: 784: 779: 774: 769: 764: 759: 754: 749: 745: 739: 734: 729: 724: 719: 714: 709: 704: 699: 694: 689: 684: 679: 675: 631: 627: 613: 609: 606: 603: 600: 597: 594: 591: 588: 585: 582: 579: 576: 573: 571: 566: 562: 559: 556: 553: 550: 547: 544: 541: 538: 535: 532: 529: 526: 524: 521:Mean monthly 519: 513: 508: 503: 498: 493: 488: 483: 478: 473: 468: 463: 458: 453: 449: 443: 438: 433: 428: 423: 418: 413: 408: 403: 398: 393: 388: 383: 379: 373: 368: 363: 358: 353: 348: 343: 338: 333: 328: 323: 318: 313: 309: 265: 261: 257: 250: 248: 244: 239: 237: 233: 229: 223: 221: 220:Catalina eddy 217: 213: 209: 200: 198: 196: 192: 188: 187:Inland Empire 184: 180: 176: 172: 166: 164: 160: 156: 152: 147: 145: 144:Inland Empire 141: 137: 133: 129: 121: 120:Catalina eddy 115: 108: 106: 104: 100: 96: 95:Pacific Ocean 92: 88: 84: 79: 77: 73: 69: 65: 61: 57: 53: 46: 41: 35: 30: 19: 1705:Weather lore 1681:. 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Retrieved 1225: 1216: 1157: 1104:marine layer 1101: 1084: 1077: 1073: 1065: 1042: 1034: 1000: 996: 994: 987: 246: 242: 240: 224: 204: 167: 151:marine layer 148: 125: 91:marine layer 80: 54:is a mainly 51: 50: 29: 1477:October 20, 109:Description 1699:Categories 1589:"In a Fog" 1585:Ron Donoho 1245:References 1154:satellite. 1080:sea breeze 52:June Gloom 45:Seal Beach 1648:April 26, 1522:April 11, 1379:April 26, 1278:April 15, 1085:A strong 1008:Formation 997:high fog. 516:(379.25) 212:inversion 1496:Archived 1373:scpr.org 1236:ThreadEx 1202:Tule fog 1166:See also 1128:Portugal 934:Percent 929:3,054.6 568:Percent 563:3,254.2 260:Downtown 64:overcast 18:High fog 1566:June 2, 1544:June 2, 1426:June 7, 1132:Namibia 1124:Morocco 1108:stratus 1061:La Niña 1004:beach. 857:(0.51) 852:(0.76) 812:(14.2) 802:(12.0) 797:(15.9) 792:(18.4) 787:(19.3) 782:(18.6) 777:(16.7) 772:(15.2) 767:(13.3) 762:(11.8) 757:(10.4) 742:(20.9) 737:(18.2) 732:(20.6) 727:(22.7) 722:(24.4) 717:(24.7) 712:(23.7) 707:(21.6) 702:(20.3) 697:(19.7) 692:(18.7) 687:(18.3) 682:(18.4) 486:(0.25) 446:(13.2) 436:(11.1) 431:(14.8) 426:(17.3) 421:(17.8) 416:(17.6) 411:(15.7) 406:(13.9) 401:(11.9) 396:(10.6) 376:(24.0) 371:(19.8) 366:(22.7) 361:(25.8) 356:(28.4) 351:(29.1) 346:(28.4) 341:(25.6) 336:(23.6) 331:(22.6) 326:(21.2) 321:(20.3) 316:(20.1) 236:La Niña 232:El Niño 163:drizzle 128:stratus 103:El Niño 99:La Niña 87:drizzle 1683:May 4, 1599:May 4, 1452:May 9, 1316:May 4, 1130:, and 1118:, the 1068:advect 926:231.3 923:230.1 920:243.4 917:253.3 914:295.0 911:304.7 908:242.4 905:250.5 902:276.2 899:261.0 896:227.4 893:239.3 882:(263) 862:(3.8) 847:(1.8) 842:(3.0) 807:(9.1) 752:(9.4) 633:Month 560:219.4 557:217.3 554:255.1 551:278.5 548:349.5 545:364.1 542:275.8 539:276.2 536:303.5 533:267.0 530:222.5 527:225.3 496:(6.1) 491:(1.0) 481:(2.3) 476:(6.6) 441:(8.6) 391:(9.6) 386:(8.8) 267:Month 60:cloudy 1208:Notes 1172:Gloom 1152:Terra 1148:MODIS 880:10.34 877:(39) 872:(26) 867:(14) 837:(20) 832:(46) 827:(58) 822:(50) 672:Year 514:14.93 511:(59) 506:(26) 501:(17) 471:(23) 466:(62) 461:(97) 456:(79) 306:Year 1720:Rain 1685:2012 1678:NASA 1650:2016 1627:2011 1601:2012 1568:2015 1546:2015 1524:2016 1479:2013 1454:2014 1428:2013 1381:2016 1350:2011 1340:NOAA 1318:2012 1280:2013 1126:and 1116:Peru 1043:The 875:1.53 870:1.01 865:0.57 860:0.15 855:0.02 850:0.03 845:0.07 840:0.12 835:0.78 830:1.81 825:2.27 820:1.98 810:57.5 805:48.4 800:53.6 795:60.6 790:65.2 785:66.7 780:65.4 775:62.0 770:59.4 765:55.9 760:53.2 755:50.7 750:49.0 740:69.7 735:64.7 730:69.0 725:72.8 720:75.9 715:76.4 710:74.6 705:70.8 700:68.5 695:67.5 690:65.6 685:65.0 680:65.1 669:Dec 666:Nov 663:Oct 660:Sep 657:Aug 654:Jul 651:Jun 648:May 645:Apr 642:Mar 639:Feb 636:Jan 509:2.33 504:1.04 499:0.66 494:0.24 489:0.04 484:0.01 479:0.09 474:0.26 469:0.91 464:2.43 459:3.80 454:3.12 444:55.7 439:47.5 434:52.0 429:58.7 424:63.1 419:64.1 414:63.6 409:60.3 404:57.1 399:53.5 394:51.0 389:49.3 384:47.8 374:75.2 369:67.7 364:72.8 359:78.5 354:83.1 349:84.4 344:83.1 339:78.1 334:74.5 329:72.7 324:70.2 319:68.6 314:68.2 303:Dec 300:Nov 297:Oct 294:Sep 291:Aug 288:Jul 285:Jun 282:May 279:Apr 276:Mar 273:Feb 270:Jan 245:and 185:and 177:and 159:mist 85:and 1710:Fog 1110:or 1106:of 976:69 973:74 970:73 967:69 964:68 961:71 958:70 955:57 952:58 949:71 946:70 943:74 940:75 610:73 607:71 604:70 601:73 598:75 595:84 592:83 589:64 586:64 583:78 580:72 577:72 574:71 256:USC 155:fog 138:in 83:fog 1701:: 1676:. 1670:. 1658:^ 1618:. 1591:. 1576:^ 1515:. 1470:. 1419:. 1371:. 1358:^ 1338:. 1326:^ 1304:. 1288:^ 1271:. 1253:^ 1078:A 258:, 62:, 1687:. 1652:. 1629:. 1603:. 1570:. 1548:. 1526:. 1481:. 1456:. 1430:. 1383:. 1352:. 1320:. 1282:. 36:. 20:)

Index

High fog
June Gloom (song)

Seal Beach
Southern California
cloudy
overcast
colloquialisms
stratus clouds
California Current
fog
drizzle
marine layer
Pacific Ocean
La Niña
El Niño

Catalina eddy
stratus
fog may cover the San Francisco Bay Area
Salinas Valley
central California
Inland Empire
marine layer
fog
mist
drizzle
Los Angeles Basin
San Fernando Valley
San Gabriel Valley

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