Mount Washington Observatory

Mount Washington Observatory
Company typePrivate Non-Profit Organization
GenreWeather Observation and Education
PredecessorU.S. Signal Service
Founded1932 (1932)
Headquarters
Sargent's Purchase, New Hampshire
,
United States
Key people
Executive Director:
Drew Bush
Chair of the Board: Rob Kirsch
Revenue1,788,138 United States dollar (2017) Edit this on Wikidata
Total assets5,678,223 United States dollar (2022) Edit this on Wikidata
Websitemountwashington.org

The Mount Washington Observatory (MWObs) is a private, non-profit scientific and educational institution organized under the laws of the state of New Hampshire. The weather observation station is located on the summit of Mount Washington in New Hampshire. The first regular meteorological observations on Mount Washington were conducted by the U.S. Signal Service, a precursor of the Weather Bureau, from 1870 to 1892.

History

The original anemometer that measured The Big Wind in 1934 at Mount Washington Observatory

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[1] that at the time was the highest recorded 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 sling psychrometer, 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.

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 article concluded that Mt. Washington most likely did not have the world's worst weather). The Sherman Adams summit building, named for the 67th Governor of New Hampshire, 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.[2][3][4]

Climatic data

Climate data for Mount Washington, elev. 6,267 ft (1,910.2 m) near the summit (1991–2020 normals, extremes 1933–present)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 48
(9) 		48
(9) 		54
(12) 		60
(16) 		66
(19) 		72
(22) 		71
(22) 		72
(22) 		69
(21) 		62
(17) 		52
(11) 		47
(8) 		72
(22)
Mean maximum °F (°C) 38.7
(3.7) 		35.6
(2.0) 		40.8
(4.9) 		49.0
(9.4) 		58.8
(14.9) 		64.5
(18.1) 		65.4
(18.6) 		64.2
(17.9) 		61.4
(16.3) 		53.8
(12.1) 		45.8
(7.7) 		39.8
(4.3) 		67.2
(19.6)
Mean daily maximum °F (°C) 14.9
(−9.5) 		14.8
(−9.6) 		20.8
(−6.2) 		30.7
(−0.7) 		42.5
(5.8) 		51.4
(10.8) 		55.3
(12.9) 		54.2
(12.3) 		49.1
(9.5) 		37.7
(3.2) 		28.4
(−2.0) 		20.1
(−6.6) 		35.0
(1.7)
Daily mean °F (°C) 5.8
(−14.6) 		5.9
(−14.5) 		12.9
(−10.6) 		23.7
(−4.6) 		36.3
(2.4) 		45.5
(7.5) 		49.9
(9.9) 		48.7
(9.3) 		43.1
(6.2) 		31.3
(−0.4) 		20.8
(−6.2) 		11.8
(−11.2) 		28.0
(−2.2)
Mean daily minimum °F (°C) −3.2
(−19.6) 		−3.0
(−19.4) 		4.9
(−15.1) 		16.7
(−8.5) 		30.2
(−1.0) 		39.6
(4.2) 		44.5
(6.9) 		43.2
(6.2) 		37.1
(2.8) 		24.9
(−3.9) 		13.1
(−10.5) 		3.5
(−15.8) 		21.0
(−6.1)
Mean minimum °F (°C) −28.6
(−33.7) 		−25.2
(−31.8) 		−19.4
(−28.6) 		−1.1
(−18.4) 		14.0
(−10.0) 		25.7
(−3.5) 		34.4
(1.3) 		31.4
(−0.3) 		21.3
(−5.9) 		8.3
(−13.2) 		−5.8
(−21.0) 		−20.8
(−29.3) 		−32.3
(−35.7)
Record low °F (°C) −47
(−44) 		−47
(−44) 		−38
(−39) 		−20
(−29) 		−2
(−19) 		8
(−13) 		24
(−4) 		20
(−7) 		9
(−13) 		−5
(−21) 		−26
(−32) 		−46
(−43) 		−47
(−44)
Average precipitation inches (mm) 5.74
(146) 		5.45
(138) 		6.72
(171) 		7.31
(186) 		7.68
(195) 		8.59
(218) 		8.93
(227) 		7.72
(196) 		7.66
(195) 		9.99
(254) 		8.09
(205) 		7.35
(187) 		91.23
(2,317)
Average snowfall inches (cm) 41.4
(105) 		43.3
(110) 		46.2
(117) 		33.1
(84) 		12.9
(33) 		1.3
(3.3) 		0.0
(0.0) 		0.1
(0.25) 		1.2
(3.0) 		19.0
(48) 		35.6
(90) 		47.7
(121) 		281.8
(716)
Average extreme snow depth inches (cm) 14.1
(36) 		16.3
(41) 		17.6
(45) 		14.5
(37) 		6.1
(15) 		0.5
(1.3) 		0.0
(0.0) 		0.0
(0.0) 		0.3
(0.76) 		5.7
(14) 		8.3
(21) 		12.7
(32) 		21.0
(53)
Average precipitation days (≥ 0.01 in) 20.0 18.3 19.7 18.3 17.4 17.6 17.5 15.5 13.7 18.1 19.2 21.0 216.3
Average snowy days (≥ 0.1 in) 19.6 18.1 18.0 14.1 6.5 1.2 0.2 0.2 1.3 9.9 15.1 19.7 123.9
Mean monthly sunshine hours 92.0 106.9 127.6 143.2 171.3 151.3 145.0 130.5 127.2 127.1 82.4 83.1 1,487.6
Percent possible sunshine 32 36 34 35 37 33 31 30 34 37 29 30 33
Source 1: NOAA (sun 1961–1990)[5][6][7]
Source 2: Mount Washington Observatory (extremes 1933–present)[8]


Partners

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,[4] including L.L. Bean, Eastern Mountain Sports (EMS), Cranmore Mountain Resort, the Mt. Washington Auto Road, and the Mt. Washington Valley Chamber of Commerce. In 2011, EMS replaced L.L. Bean as the official outfitter of the Observatory.[9]

The United States Postal Service maintains a small post office for outgoing mail, located in the Sherman Adams building at the summit; the ZIP Code is 03589.[10]

See also

References

  1. ^ "Mount Washington Observatory | World Record Wind | Mount Washington Observatory". mountwashington.org. Archived from the original on 2018-03-17.
  2. ^ Allen Press "The Mount Washington Weather Observatory - 50 Years Old"[permanent dead link‍]
  3. ^ "Worst Weather in the World by Charles F. Brooks". www.davidalbeck.com. Retrieved 2023-12-28.
  4. ^ a b Mount Washington Observatory.
  5. ^ "NOWData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved November 25, 2024.
  6. ^ "Station: MT WASHINGTON, NH". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Archived from the original on May 12, 2021. Retrieved 2021-05-18.
  7. ^ "WMO Climate Normals for MOUNT WASHINGTON, NH 1961–1990". National Oceanic and Atmospheric Administration. Archived from the original on May 25, 2017. Retrieved 2014-06-09.
  8. ^ "Mount Washington Observatory: Normals, Means and Extreme". Mount Washington Observatory. Archived from the original on November 26, 2024. Retrieved November 26, 2024.
  9. ^ "Mount Washington Observatory and Eastern Mountain Sports Forge New Multi-Year Partnership" (Press release). January 3, 2011.
  10. ^ Rogers, Barbara Radcliffe (May 9, 2019). "A trip to the Mt. Washington summit". nhmagazine.com. Retrieved August 28, 2019.

Further reading

Boucher, Norman (1981-02-24). "How Cold Was It?: Five Days at the Mount Washington Observatory". The Boston Phoenix. Retrieved 2024-02-22.

44°16′13″N 71°18′12″W / 44.27028°N 71.30333°W / 44.27028; -71.30333