| < December >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Number of Wet Days (probability of rain on a day)
|Average Sunlight per day
|Average Daylight per day
|Sunny (Cloudy) Daylight Hours
|Sun altitude at solar noon on the 21st day.
- The average temperature in Portland, Oregon in December is cool at 4.6 °C (40.28 °F).
- Afternoons can be a little cool with average high temperatures reaching 7.6 °C (45.7 °F).
- Overnight temperatures are generally very cool with an average low of 1.6 °C (34.9 °F).
- In December the mean diurnal temperature range/ variation is 6 °C (10.8 °F).
- The weather in December is a little damp with sleet, rain or snow from time to time. Some 155.7mm (6.1in) of liquid precipitates across an average of 19 days.
- The heavens above Portland, Oregon are really dreary with on average only 1:48 of splendid solar radiation per day.
- The shortest day is 8:41 long and the longest day is 8:56 long with an average length of 8:45.
- There are approximately 6:45 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
- It is sunny approximately 21.1% of daylight hours and cloudy 78.9% of daylight hours.
Check the distance to and compare the Portland, Oregon December averages with somewhere beginning with:
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Weather Trend Graph for December in Portland, Oregon, Usa
Navigate to December Weather in Locations Surrounding Portland, Oregon:
- Centralia, Wa, Usa - 158.7 kms (98.6 miles) N
- Aberdeen, Wa, Usa - 179.2 kms (111.4 miles) NNW
- Olympia, Wa, Usa - 153.7 kms (95.5 miles) N
- Astoria/ Clatsop, Or, Usa - 116.7 kms (72.5 miles) WNW
- Vancouver, Wa, Usa - 6.4 kms (4 miles) NW
- Salem, Or, Usa - 83.2 kms (51.7 miles) SSW
- Corvallis, Or, Usa - 126.3 kms (78.5 miles) SSW
- Eugene, Or, Usa - 172 kms (106.9 miles) SSW
- Seattle, Washington, Usa - 224 kms (139.2 miles) N
- Seattle/ Tacoma, Wa, Usa - 207 kms (128.6 miles) N
- Yakima, Wa, Usa - 192.2 kms (119.5 miles) NE
- Sunnyside, Wa, Usa - 206.4 kms (128.3 miles) ENE
- Moro, Or, Usa - 141.8 kms (88.1 miles) ESE