Weather in December
Temperature
In Mount Rainier National Park, December is the coldest month, with temperatures averaging a high of 33.8°F (1°C) and a low of 21°F (-6.1°C).Rainfall
In December, the rain falls for 21.1 days. Throughout December, 17.17" (436mm) of precipitation is accumulated. In Mount Rainier National Park, Washington, during the entire year, the rain falls for 188.7 days and collects up to 118.31" (3005mm) of precipitation.Snowfall
Months with snowfall are January through December. The month with the most snowfall is December, when snow falls for 19 days and typically aggregates up to 124.02" (3150mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 7:32 am and sunset at 4:20 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:28 pm PST.
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Data Sources | Weather Forecasting & Climate
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Average temperature in December
Mount Rainier National Park, WA
- Average high temperature in December: 33.8°F
The warmest month (with the highest average high temperature) is August (64.5°F).
The month with the lowest average high temperature is December (33.8°F).
- Average low temperature in December: 21.1°F
The month with the highest average low temperature is August (43.9°F).
The coldest month (with the lowest average low temperature) is December (21.1°F).
Average rainfall in December
Mount Rainier National Park, WA
- Average rainfall in December: 17.2"
The wettest month (with the highest rainfall) is November (20.3").
The driest months (with the least rainfall) are July and August (2").
Average rainfall days in December
Mount Rainier National Park, WA
- Average rainfall days in December: 21.1 days
The month with the highest number of rainy days is November (21.7 days).
The month with the least rainy days is August (6.6 days).
Average snowfall in December
Mount Rainier National Park, WA
- Average snowfall in December: 99.9"
The months with the highest snowfall are January, November and December (99.9").
The month with the least snowfall is August (0.1").
Average snowfall days in December
Mount Rainier National Park, WA
- Average snowfall days in December: 19 days
The month with the highest number of snowfall days is March (19.5 days).
The month with the least snowfall days is August (0.1 days).
Average daylight in December
Mount Rainier National Park, WA
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
Mount Rainier National Park, Washington, USA
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