27:
123:
187:
210:
The observatory makes prominent use of the slogan "Home of the World's Worst
Weather", a claim that originated with a 1940 article by Charles Brooks (the man generally given the majority of credit for creating the Mount Washington Observatory), titled "The Worst Weather In the World" (even though the
202:
The U.S. Signal
Service, a predecessor to the Weather Bureau, occupied the summit and kept records from 1870 to 1892. Starting in 1932, the current observatory began keeping records. On April 12, 1934, the observatory staff recorded a wind gust of 231 mph that at the time was the highest recorded
207:, a simple device containing two mercury thermometers. Where most unstaffed weather stations have undergone technology upgrades, consistent use of the sling psychrometer has helped provide scientific precision to the Mount Washington climate record.
1375:
1200:
The Mount
Washington Observatory receives much of its support from contributing members. However, over the years the MWObs has also come to receive support from several company and organizational partners, including
203:
wind speed in the world, a record that was held until 1996. The observatory's weather data have accumulated into a valuable climate record since. Temperature and humidity readings have been collected using a
1367:
223:, houses the observatory; it is closed to the public during the winter and hikers are not allowed inside the building except for emergencies and pre-arranged guided tours.
1400:
1396:
1291:
1586:
1270:
1547:
1591:
85:
235:
Climate data for Mount
Washington, elev. 6,267 ft (1,910.2 m) near the summit (1991–2020 normals, extremes 1933–present)
163:
1425:
1446:
1346:
1225:
1245:
1510:
220:
1484:
1214:
1210:
26:
1206:
43:
1538:
1278:
40:
1250:
1479:
122:
171:
158:
scientific and educational institution organized under the laws of the state of New
Hampshire. The
204:
1130:
1083:
1465:"Mount Washington Observatory and Eastern Mountain Sports Forge New Multi-Year Partnership"
1271:"Mount Washington Observatory | World Record Wind | Mount Washington Observatory"
170:. The first regular meteorological observations on Mount Washington were conducted by the
159:
1464:
186:
1303:
175:
1580:
1421:
775:
216:
167:
1450:
1342:
16:
Observation station and nonprofit institution atop Mount
Washington, New Hampshire
1229:
1221:. In 2011, EMS replaced L.L. Bean as the official outfitter of the Observatory.
195:
191:
155:
1562:
1549:
1232:
for outgoing mail, located in the
Sherman Adams building at the summit; the
1202:
1233:
1292:
Allen Press "The Mount
Washington Weather Observatory - 50 Years Old"
1372:
U.S. Climate
Normals 2020: U.S. Monthly Climate Normals (1991-2020)
1533:
1329:
185:
1511:"How Cold Was It?: Five Days at the Mount Washington Observatory"
1218:
1177:
1185:
Source 2: Mount
Washington Observatory (extremes 1933–present)
1539:
The Meteorologial Records of the Mount Washington Observatory
135:
1449:. Mount Washington Observatory. 2013-01-14. Archived from
1422:"Mount Washington Observatory: Normals, Means and Extreme"
1397:"WMO Climate Normals for MOUNT WASHINGTON, NH 1961–1990"
211:
article concluded that Mt. Washington most likely did
1399:. National Oceanic and Atmospheric Administration.
1374:. National Oceanic and Atmospheric Administration.
1345:. National Oceanic and Atmospheric Administration.
130:
115:
96:
80:
65:
57:
49:
36:
1304:"Worst Weather in the World by Charles F. Brooks"
1325:
1323:
8:
19:
119:1,788,138 United States dollar (2017)
231:
121:
25:
18:
1478:Rogers, Barbara Radcliffe (May 9, 2019).
1219:Mt. Washington Valley Chamber of Commerce
1447:"Today's Weather atop Mount Washington"
1262:
918:Average extreme snow depth inches (cm)
198:in 1934 at Mount Washington Observatory
1480:"A trip to the Mt. Washington summit"
215:have the world's worst weather). The
7:
1343:"NOWData – NOAA Online Weather Data"
219:summit building, named for the 67th
31:Mount Washington Observatory in 2004
14:
1467:(Press release). January 3, 2011.
1428:from the original on July 2, 2014
1403:from the original on May 25, 2017
1378:from the original on May 12, 2021
86:Sargent's Purchase, New Hampshire
53:Weather Observation and Education
1587:Mount Washington (New Hampshire)
1424:. Mount Washington Observatory.
1349:from the original on May 2, 2021
1509:Boucher, Norman (1981-02-24).
1:
848:Average snowfall inches (cm)
1592:Meteorological observatories
1541:at Dartmouth College Library
1534:Mount Washington Observatory
1368:"Station: MT WASHINGTON, NH"
1330:Mount Washington Observatory
1226:United States Postal Service
162:is located on the summit of
148:Mount Washington Observatory
20:Mount Washington Observatory
1246:Mount Washington State Park
988:Average precipitation days
564:Mean daily minimum °F (°C)
424:Mean daily maximum °F (°C)
160:weather observation station
1608:
1184:
1175:
234:
1128:
1081:
1034:
987:
917:
847:
773:
703:
633:
563:
493:
423:
353:
283:
278:
275:
272:
269:
266:
263:
260:
257:
254:
251:
248:
245:
242:
239:
221:Governor of New Hampshire
24:
1215:Mt. Washington Auto Road
1211:Cranmore Mountain Resort
1207:Eastern Mountain Sports
44:Non-Profit Organization
199:
1563:44.27028°N 71.30333°W
1251:Blue Hill Observatory
634:Mean minimum °F (°C)
354:Mean maximum °F (°C)
189:
178:, from 1870 to 1892.
174:, a precursor of the
284:Record high °F (°C)
1568:44.27028; -71.30333
1559: /
1308:www.davidalbeck.com
1275:mountwashington.org
1035:Average snowy days
704:Record low °F (°C)
494:Daily mean °F (°C)
172:U.S. Signal Service
109:Chair of the Board:
103:Executive Director:
61:U.S. Signal Service
21:
1515:The Boston Phoenix
1228:maintains a small
205:sling psychrometer
200:
1189:
1188:
1131:possible sunshine
144:
143:
1599:
1574:
1573:
1571:
1570:
1569:
1564:
1560:
1557:
1556:
1555:
1552:
1524:
1522:
1521:
1497:
1496:
1494:
1492:
1475:
1469:
1468:
1461:
1455:
1454:
1443:
1437:
1436:
1434:
1433:
1418:
1412:
1411:
1409:
1408:
1393:
1387:
1386:
1384:
1383:
1364:
1358:
1357:
1355:
1354:
1339:
1333:
1327:
1318:
1317:
1315:
1314:
1300:
1294:
1289:
1283:
1282:
1277:. Archived from
1267:
1180:(sun 1961–1990)
1038:
991:
232:
164:Mount Washington
154:) is a private,
140:
137:
126:
125:
76:
74:
29:
22:
1607:
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1602:
1601:
1600:
1598:
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1577:
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1567:
1565:
1561:
1558:
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1550:
1548:
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1530:
1519:
1517:
1508:
1506:
1504:Further reading
1501:
1500:
1490:
1488:
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1366:
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1312:
1310:
1302:
1301:
1297:
1290:
1286:
1269:
1268:
1264:
1259:
1242:
1198:
1192:
1190:
1036:
989:
982:
977:
972:
967:
962:
957:
952:
947:
942:
937:
932:
927:
922:
912:
907:
902:
897:
892:
887:
882:
877:
872:
867:
862:
857:
852:
842:
837:
832:
827:
822:
817:
812:
807:
802:
797:
792:
787:
782:
768:
763:
758:
753:
748:
743:
738:
733:
728:
723:
718:
713:
708:
698:
693:
688:
683:
678:
673:
668:
663:
658:
653:
648:
643:
638:
628:
623:
618:
613:
608:
603:
598:
593:
588:
583:
578:
573:
568:
558:
553:
548:
543:
538:
533:
528:
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518:
513:
508:
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483:
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458:
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438:
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428:
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403:
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378:
373:
368:
363:
358:
348:
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338:
333:
328:
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318:
313:
308:
303:
298:
293:
288:
229:
184:
136:mountwashington
134:
120:
107:
105:
99:
92:
88:
72:
70:
32:
17:
12:
11:
5:
1605:
1603:
1595:
1594:
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1579:
1578:
1543:
1542:
1536:
1529:
1528:External links
1526:
1505:
1502:
1499:
1498:
1485:nhmagazine.com
1470:
1456:
1453:on 2013-01-15.
1438:
1413:
1388:
1359:
1334:
1319:
1295:
1284:
1281:on 2018-03-17.
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1248:
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1116:
1113:
1110:
1107:
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1101:
1098:
1095:
1092:
1089:
1086:
1084:sunshine hours
1079:
1078:
1075:
1072:
1069:
1066:
1063:
1060:
1057:
1054:
1051:
1048:
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939:
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919:
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914:
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904:
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854:
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824:
819:
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460:
455:
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435:
430:
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421:
420:
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410:
405:
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395:
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385:
380:
375:
370:
365:
360:
355:
351:
350:
345:
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305:
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268:
265:
262:
259:
256:
253:
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247:
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241:
237:
236:
230:
228:
225:
194:that measured
183:
180:
176:Weather Bureau
142:
141:
132:
128:
127:
117:
113:
112:
100:
97:
94:
93:
90:
84:
82:
78:
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67:
63:
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59:
55:
54:
51:
47:
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38:
34:
33:
30:
15:
13:
10:
9:
6:
4:
3:
2:
1604:
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1575:
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1540:
1537:
1535:
1532:
1531:
1527:
1525:
1516:
1512:
1503:
1487:
1486:
1481:
1474:
1471:
1466:
1460:
1457:
1452:
1448:
1442:
1439:
1427:
1423:
1417:
1414:
1402:
1398:
1392:
1389:
1377:
1373:
1369:
1363:
1360:
1348:
1344:
1338:
1335:
1331:
1326:
1324:
1320:
1309:
1305:
1299:
1296:
1293:
1288:
1285:
1280:
1276:
1272:
1266:
1263:
1256:
1252:
1249:
1247:
1244:
1243:
1239:
1237:
1235:
1231:
1227:
1222:
1220:
1216:
1212:
1208:
1204:
1195:
1193:
1183:
1179:
1174:
1170:
1167:
1164:
1161:
1158:
1155:
1152:
1149:
1146:
1143:
1140:
1137:
1134:
1132:
1127:
1123:
1120:
1117:
1114:
1111:
1108:
1105:
1102:
1099:
1096:
1093:
1090:
1087:
1085:
1082:Mean monthly
1080:
1076:
1073:
1070:
1067:
1064:
1061:
1058:
1055:
1052:
1049:
1046:
1043:
1040:
1033:
1029:
1026:
1023:
1020:
1017:
1014:
1011:
1008:
1005:
1002:
999:
996:
993:
986:
980:
975:
970:
965:
960:
955:
950:
945:
940:
935:
930:
925:
920:
916:
910:
905:
900:
895:
890:
885:
880:
875:
870:
865:
860:
855:
850:
846:
840:
835:
830:
825:
820:
815:
810:
805:
800:
795:
790:
785:
780:
777:
776:precipitation
772:
766:
761:
756:
751:
746:
741:
736:
731:
726:
721:
716:
711:
706:
702:
696:
691:
686:
681:
676:
671:
666:
661:
656:
651:
646:
641:
636:
632:
626:
621:
616:
611:
606:
601:
596:
591:
586:
581:
576:
571:
566:
562:
556:
551:
546:
541:
536:
531:
526:
521:
516:
511:
506:
501:
496:
492:
486:
481:
476:
471:
466:
461:
456:
451:
446:
441:
436:
431:
426:
422:
416:
411:
406:
401:
396:
391:
386:
381:
376:
371:
366:
361:
356:
352:
346:
341:
336:
331:
326:
321:
316:
311:
306:
301:
296:
291:
286:
282:
238:
233:
227:Climatic data
226:
224:
222:
218:
217:Sherman Adams
214:
208:
206:
197:
193:
190:The original
188:
181:
179:
177:
173:
169:
168:New Hampshire
165:
161:
157:
153:
149:
139:
133:
129:
124:
118:
114:
110:
104:
101:
95:
91:United States
87:
83:
79:
68:
64:
60:
56:
52:
48:
45:
42:
39:
35:
28:
23:
1544:
1518:. Retrieved
1514:
1507:
1489:. Retrieved
1483:
1473:
1459:
1451:the original
1441:
1430:. Retrieved
1416:
1405:. Retrieved
1391:
1380:. Retrieved
1371:
1362:
1351:. Retrieved
1337:
1311:. Retrieved
1307:
1298:
1287:
1279:the original
1274:
1265:
1223:
1199:
1191:
778:inches (mm)
212:
209:
201:
196:The Big Wind
151:
147:
145:
108:
102:
81:Headquarters
37:Company type
1566: /
1230:post office
990:(≥ 0.01 in)
58:Predecessor
1581:Categories
1554:71°18′12″W
1551:44°16′13″N
1520:2024-02-22
1491:August 28,
1432:2010-08-07
1407:2014-06-09
1382:2021-05-18
1353:2021-05-18
1313:2023-12-28
1257:References
1236:is 03589.
1217:, and the
1176:Source 1:
1037:(≥ 0.1 in)
192:anemometer
156:non-profit
111:Rob Kirsch
98:Key people
1203:L.L. Bean
106:Drew Bush
1426:Archived
1401:Archived
1376:Archived
1347:Archived
1240:See also
1234:ZIP Code
1196:Partners
1129:Percent
1124:1,487.6
843:(2,317)
774:Average
699:(−35.7)
694:(−29.3)
689:(−21.0)
684:(−13.2)
659:(−10.0)
654:(−18.4)
649:(−28.6)
644:(−31.8)
639:(−33.7)
624:(−15.8)
619:(−10.5)
579:(−15.1)
574:(−19.4)
569:(−19.6)
554:(−11.2)
509:(−10.6)
504:(−14.5)
499:(−14.6)
1209:(EMS),
963:(0.76)
888:(0.25)
679:(−5.9)
674:(−0.3)
664:(−3.5)
629:(−6.1)
614:(−3.9)
589:(−1.0)
584:(−8.5)
559:(−2.2)
549:(−6.2)
544:(−0.4)
514:(−4.6)
484:(−6.6)
479:(−2.0)
464:(12.3)
459:(12.9)
454:(10.8)
444:(−0.7)
439:(−6.2)
434:(−9.6)
429:(−9.5)
419:(19.6)
404:(12.1)
399:(16.3)
394:(17.9)
389:(18.6)
384:(18.1)
379:(14.9)
182:History
131:Website
116:Revenue
71: (
66:Founded
41:Private
1213:, the
1115:127.1
1112:127.2
1109:130.5
1106:145.0
1103:151.3
1100:171.3
1097:143.2
1094:127.6
1091:106.9
1077:123.9
1030:216.3
958:(0.0)
953:(0.0)
948:(1.3)
913:(716)
908:(121)
893:(3.0)
883:(0.0)
878:(3.3)
863:(117)
858:(110)
853:(105)
838:(187)
833:(205)
828:(254)
823:(195)
818:(196)
813:(227)
808:(218)
803:(195)
798:(186)
793:(171)
788:(138)
783:(146)
769:(−44)
764:(−43)
759:(−32)
754:(−21)
749:(−13)
734:(−13)
729:(−19)
724:(−29)
719:(−39)
714:(−44)
709:(−44)
669:(1.3)
609:(2.8)
604:(6.2)
599:(6.9)
594:(4.2)
539:(6.2)
534:(9.3)
529:(9.9)
524:(7.5)
519:(2.4)
489:(1.7)
474:(3.2)
469:(9.5)
449:(5.8)
414:(4.3)
409:(7.7)
374:(9.4)
369:(4.9)
364:(2.0)
359:(3.7)
240:Month
1121:83.1
1118:82.4
1088:92.0
1074:19.7
1071:15.1
1050:14.1
1047:18.0
1044:18.1
1041:19.6
1027:21.0
1024:19.2
1021:18.1
1018:13.7
1015:15.5
1012:17.5
1009:17.6
1006:17.4
1003:18.3
1000:19.7
997:18.3
994:20.0
983:(53)
978:(32)
973:(21)
968:(14)
943:(15)
938:(37)
933:(45)
928:(41)
923:(36)
911:281.8
903:(90)
898:(48)
873:(33)
868:(84)
841:91.23
744:(−7)
739:(−4)
697:−32.3
692:−20.8
647:−19.4
642:−25.2
637:−28.6
349:(22)
339:(11)
334:(17)
329:(21)
324:(22)
319:(22)
314:(22)
309:(19)
304:(16)
299:(12)
279:Year
152:MWObs
50:Genre
1493:2019
1224:The
1178:NOAA
1068:9.9
1065:1.3
1062:0.2
1059:0.2
1056:1.2
1053:6.5
981:21.0
976:12.7
936:14.5
931:17.6
926:16.3
921:14.1
906:47.7
901:35.6
896:19.0
871:12.9
866:33.1
861:46.2
856:43.3
851:41.4
836:7.35
831:8.09
826:9.99
821:7.66
816:7.72
811:8.93
806:8.59
801:7.68
796:7.31
791:6.72
786:5.45
781:5.74
687:−5.8
677:21.3
672:31.4
667:34.4
662:25.7
657:14.0
652:−1.1
627:21.0
617:13.1
612:24.9
607:37.1
602:43.2
597:44.5
592:39.6
587:30.2
582:16.7
572:−3.0
567:−3.2
557:28.0
552:11.8
547:20.8
542:31.3
537:43.1
532:48.7
527:49.9
522:45.5
517:36.3
512:23.7
507:12.9
487:35.0
482:20.1
477:28.4
472:37.7
467:49.1
462:54.2
457:55.3
452:51.4
447:42.5
442:30.7
437:20.8
432:14.8
427:14.9
417:67.2
412:39.8
407:45.8
402:53.8
397:61.4
392:64.2
387:65.4
382:64.5
377:58.8
372:49.0
367:40.8
362:35.6
357:38.7
344:(8)
294:(9)
289:(9)
276:Dec
273:Nov
270:Oct
267:Sep
264:Aug
261:Jul
258:Jun
255:May
252:Apr
249:Mar
246:Feb
243:Jan
146:The
138:.org
73:1932
69:1932
1171:33
1168:30
1165:29
1162:37
1159:34
1156:30
1153:31
1150:33
1147:37
1144:35
1141:34
1138:36
1135:32
971:8.3
966:5.7
961:0.3
956:0.0
951:0.0
946:0.5
941:6.1
891:1.2
886:0.1
881:0.0
876:1.3
767:−47
762:−46
757:−26
722:−20
717:−38
712:−47
707:−47
682:8.3
622:3.5
577:4.9
502:5.9
497:5.8
213:not
166:in
1583::
1513:.
1482:.
1370:.
1322:^
1306:.
1273:.
1205:,
752:−5
742:20
737:24
727:−2
347:72
342:47
337:52
332:62
327:69
322:72
317:71
312:72
307:66
302:60
297:54
292:48
287:48
89:,
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1385:.
1356:.
1332:.
1316:.
747:9
732:8
150:(
75:)
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