WEATHER IN Seattle
Climate tables. Data for Seattle.
Monthly temperature
| Month | Record low | Average low | Average | Average high | Record high |
| january | -17.8 (1950) | 3.2 | 6.0 | 8.9 | 17.8 (1981) |
| february | -17.2 (1950) | 3.2 | 6.7 | 10.2 | 21.1 (1968) |
| march | -11.7 (1955) | 4.4 | 8.4 | 12.3 | 25.6 (2004) |
| april | -1.7 (1953) | 6.3 | 10.7 | 15.2 | 29.4 (1976) |
| may | -2.2 (1954) | 9.3 | 14.2 | 19.1 | 33.9 (1963) |
| june | 3.3 (1952) | 11.7 | 16.7 | 21.7 | 35.6 (1955) |
| july | 6.1 (1954) | 13.8 | 19.5 | 25.2 | 39.4 (2009) |
| august | 6.7 (1950) | 14.0 | 19.7 | 25.3 | 37.2 (1981) |
| september | 1.7 (1972) | 12.0 | 17.0 | 22.0 | 36.7 (1988) |
| october | -2.2 (1949) | 8.3 | 12.1 | 15.8 | 31.7 (1987) |
| november | -14.4 (1955) | 4.9 | 8.1 | 11.2 | 23.3 (2010) |
| december | -14.4 (1968) | 2.8 | 5.6 | 8.3 | 17.8 (1993) |
| year | -17.8 (1950) | 7.2 | 11.4 | 15.7 | 39.4 (2009) |
Monthly precipitation
| Month | Average | Record low | Record high | Daily high |
| january | 147 | 15 (1985) | 328 (1953) | 76 (1986) |
| february | 96 | 8 (1920) | 231 (1961) | 78 (1996) |
| march | 106 | 15 (1965) | 239 (2014) | 69 (1972) |
| april | 81 | 2 (1939) | 166 (1991) | 67 (1991) |
| may | 48 | 3 (1992) | 121 (1948) | 47 (1969) |
| june | 37 | 0.5 (1918) | 97 (1964) | 45 (1968) |
| july | 15 | 0.0 (1958) | 72 (1916) | 22 (1981) |
| august | 25 | 0.0 (1914) | 117 (1975) | 41 (1975) |
| september | 41 | 0.0 (1975) | 157 (2013) | 43 (2013) |
| october | 99 | 8 (1987) | 228 (2003) | 128 (2003) |
| november | 160 | 19 (1976) | 397 (2006) | 87 (1959) |
| december | 145 | 29 (1944) | 362 (1933) | 96 (2007) |
| year | 952 | 580 (1911) | 1387 (1950) | 128 (2003) |
Number of days with solid, liquid, and mixed precipitation
| Type of precipitation | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Wind speed, m/s
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
The frequency of different wind directions, %
| direction | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Air humidity, %
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Snow cover
| Month | jul | aug | sep | oct | nov | dec | jan | feb | mar | apr | may | jun | Year |
| number of days | |||||||||||||
| height (sm) | |||||||||||||
| max height (sm) |
Cloudy, score
| month | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
| total | |||||||||||||
| low |
Number of clear, cloudy and cloudy days
| month | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
| Total cloud | |||||||||||||
| Low cloud | |||||||||||||
Number of days with different phenomena
| phenomenon | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
The frequency of different types of clouds, %
| type of clouds | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |