Normal, Means, and Extremes
The following tables provide the “normal” weather conditions on Mount Washington for each month, averaged over the period of 1991-2020. Also included are the extreme (record) conditions recorded during the station’s history, from 1933 to the present.
Note: Values on this page are subject to change without notice.
Temperatures (°F)
| Normal Monthly Average |
Normal Daily Maximum Average |
Normal Daily Minimum Average |
Record High (Year) |
Record Low (Year) |
|
| January | 5.8 | 14.9 | -3.2 | 48 (2013) | -47 (1934) |
| February | 5.9 | 14.8 | -3.0 | 48 (2018) | -46 (1943) |
| March | 12.9 | 20.8 | 4.9 | 54 (1998, 2012) | -38 (1950) |
| April | 23.7 | 30.7 | 16.7 | 60 (1976) | -20 (1995) |
| May | 36.3 | 42.5 | 30.2 | 66 (1977,2020) | -2 (1966) |
| June | 45.5 | 51.4 | 39.6 | 72 (2003) | 8 (1945) |
| July | 49.9 | 55.3 | 44.5 | 71 (1953,2018) | 24 (2001) |
| August | 48.7 | 54.2 | 43.2 | 72 (1975) | 20 (1986) |
| September | 43.1 | 49.1 | 37.1 | 69 (1999) | 9 (1992) |
| October | 31.3 | 37.7 | 24.9 | 62 (2005) | -5 (1939) |
| November | 20.8 | 28.4 | 13.1 | 52 (1982,2019) | -26 (2018) |
| December | 11.8 | 20.1 | 3.5 | 47 (2001) | -46 (1933) |
| Annual | 28.0 | 35.0 | 21.0 | 72 (Aug. 1975) | -47 (Jan. 1934) |
Precipitation (Water Equivalent, Inches)
| Normal Monthly Average |
Record Maximum Monthly Total (Year) |
Record Minimum Monthly Total (Year) |
Record Maximum in 24 Hours (Year) |
|
| January | 5.74 | 18.23 (1958) | 1.29 (1981) | 4.85 (1986) |
| February | 5.45 | 25.56 (1969) | 0.98 (1980) | 10.30 (1970) |
| March | 6.72 | 15.98 (1977) | 2.15 (1946) | 6.45 (1999) |
| April | 7.31 | 15.21 (1988) | 2.19 (1959) | 8.30 (1984) |
| May | 7.68 | 19.00 (1997) | 1.78 (1951) | 4.60 (1967) |
| June | 8.59 | 16.00 (1973) | 2.43 (1979) | 6.50 (1973) |
| July | 8.93 | 16.59 (1996) | 2.69 (1995) | 7.37 (1969) |
| August | 7.72 | 20.69 (1991) | 2.46 (1996) | 6.66 (2011) |
| September | 7.66 | 15.47 (1994) | 2.74 (1948) | 5.38 (1985) |
| October | 9.99 | 28.70 (2005) | 0.75 (1947) | 11.07 (1996) |
| November | 8.09 | 19.56 (1983) | 2.31 (1939) | 6.07 (1968) |
| December | 7.35 | 17.95 (1973) | 1.49 (1955) | 8.64 (1969) |
| Annual | 91.23 | |||
| Record Maximum Yearly Average (Year) | Record Minimum Yearly Average (Year) | |||
| 130.14 (1969) | 71.34 (1979) | |||
Snow, Ice Pellets, Hail (Inches)
| Normal Monthly Average |
Record Maximum Monthly Total (Year) |
Record Maximum in 24 Hours (Year) |
|
| January | 41.4 | 94.6 (1978) | 24.0 (1978) |
| February | 43.3 | 172.8 (1969) | 49.3 (1969) |
| March | 46.2 | 98.0 (1970) | 27.4 (1969) |
| April | 33.1 | 110.9 (1988) | 27.2 (1988) |
| May | 12.9 | 95.8 (1997) | 22.2 (1967) |
| June | 1.3 | 8.1 (1959) | 5.1 (1988) |
| July | 0.0 | 1.1 (1957) | 1.1 (1957) |
| August | 0.1 | 2.5 (1965) | 2.5 (1965) |
| September | 1.2 | 7.8 (1949) | 7.7 (1986) |
| October | 19.0 | 78.9 (2005) | 25.7 (2005) |
| November | 35.6 | 86.6 (1968) | 25.0 (1968) |
| December | 47.7 | 103.7 (1968) | 37.5 (1968) |
| Annual | 281.8 | ||
| Record Maximum Seasonal Total (Year) | |||
| 566.4 (1968-69) | |||
Wind (MPH)
| Normal Monthly Average Speed |
Normal Monthly Average Direction |
Record Peak Gust Direction (Year) |
|
| January | 45.6 | W | 172 – NW (1985) |
| February | 44.6 | W | 171 – W (2019) |
| March | 39.8 | W | 180 – W(1942) |
| April | 35.6 | W | 231 – SE (1934) |
| May | 29.6 | W | 164 – W (1945) |
| June | 26.8 | W | 136 – NW (1941) |
| July | 25.5 | W | 154 – W (1996) |
| August | 24.5 | W | 147 – SE (2020) |
| September | 27.6 | W | 174 – SE (1979) |
| October | 35.5 | W | 161 – W (1943) |
| November | 39.4 | W | 163 – NW (1983) |
| December | 44.0 | W | 178 – NW(1980) |
| Annual | 34.9 | W | 231 – SE (1934) |
