December weather in Sammamish, WA
The average temperature in Sammamish in December is 40.7°F (35.7°F–45.8°F). Average precipitation: 8.42 inches. Average snowfall is 1.5 inches.
December is a winter month in Sammamish, and is cooler than the annual average of 51.7°F. Daily temperatures swing about 10.1°F between overnight low and afternoon high. Expect about 20 days with precipitation. Daylight averages about 8h 15m. For travel, December is a wet month.
Avg High
45.8°F
Avg Low
35.7°F
Precipitation
8.42 in
Snow
1.5 in
December records in Sammamish
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1907) | 10.0°F (1985) | 2.12 in (1979) |
| December 2 | 60.1°F (1926) | 25.0°F (1954) | 2.68 in (1975) |
| December 3 | 64.9°F (1965) | 19.9°F (1928) | 3.22 in (2007) |
| December 4 | 63.0°F (1939) | 19.0°F (1972) | 1.62 in (2007) |
| December 5 | 57.0°F (1938) | 18.0°F (1972) | 2.42 in (1970) |
| December 6 | 57.9°F (1965) | 14.0°F (1956) | 2.86 in (1933) |
| December 7 | 55.9°F (1934) | 9.0°F (1972) | 1.75 in (1984) |
| December 8 | 59.0°F (1957) | 8.1°F (1972) | 1.96 in (1971) |
| December 9 | 57.0°F (1987) | 6.1°F (1932) | 2.60 in (1987) |
| December 10 | 64.0°F (1957) | 8.1°F (1932) | 1.86 in (1977) |
| December 11 | 64.0°F (1998) | 12.9°F (1932) | 3.65 in (1921) |
| December 12 | 60.1°F (1988) | 8.1°F (1919) | 2.74 in (1921) |
| December 13 | 59.0°F (1924) | 9.0°F (1919) | 2.10 in (1936) |
| December 14 | 57.9°F (1924) | 16.0°F (1926) | 3.58 in (1979) |
| December 15 | 64.0°F (1980) | 19.0°F (1965) | 3.81 in (1959) |
| December 16 | 59.0°F (1942) | 6.1°F (1964) | 2.30 in (2001) |
| December 17 | 55.9°F (1979) | 8.1°F (1924) | 2.75 in (1933) |
| December 18 | 57.9°F (2003) | 10.9°F (1924) | 2.11 in (1917) |
| December 19 | 59.0°F (1972) | 10.9°F (1990) | 2.04 in (1932) |
| December 20 | 62.1°F (1929) | 7.0°F (1990) | 5.10 in (2019) |
| December 21 | 60.1°F (1940) | 6.1°F (1983) | 2.03 in (1933) |
| December 22 | 61.0°F (1940) | 6.1°F (1983) | 2.07 in (1964) |
| December 23 | 62.1°F (1963) | 10.0°F (1924) | 2.00 in (2014) |
| December 24 | 61.0°F (1980) | 7.0°F (1924) | 2.73 in (1922) |
| December 25 | 62.1°F (1980) | 8.1°F (1924) | 1.95 in (1980) |
| December 26 | 66.9°F (1980) | 9.0°F (1924) | 2.36 in (1974) |
| December 27 | 55.9°F (1917) | 15.1°F (1978) | 2.45 in (1949) |
| December 28 | 59.0°F (1937) | 3.0°F (1990) | 3.11 in (1937) |
| December 29 | 62.1°F (1917) | 3.9°F (1968) | 2.26 in (2017) |
| December 30 | 57.0°F (1917) | 3.9°F (1968) | 1.86 in (1970) |
| December 31 | 60.1°F (1963) | 10.0°F (1968) | 1.23 in (1917) |