Seattle C.O.
The tables below display average monthly climate and weather indicators in Seattle C.O. Washington.
Temperature by: Fahrenheit / Centigrade
| Seattle C.O. Temperature |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Avg. Temperature | 5.2 | 6.8 | 8.1 | 10.2 | 13.4 | 16.3 | 18.5 | 18.7 | 16.0 | 11.9 | 7.9 | 5.3 | 11.6 |
| Avg. Max Temperature | 7.8 | 10.3 | 12.1 | 14.5 | 17.9 | 20.9 | 23.4 | 23.4 | 20.4 | 15.6 | 10.8 | 7.9 | 15.4 |
| Avg. Min Temperature | 2.4 | 3.3 | 4.2 | 5.9 | 8.8 | 11.8 | 13.6 | 14.0 | 11.6 | 8.3 | 5.0 | 2.8 | 7.7 |
| Days with Max Temp of 32 C or Higher | 0.0 | 0.0 | 0.0 | 0.0 | < 0.5 | < 0.5 | 1.0 | < 0.5 | < 0.5 | 0.0 | 0.0 | 0.0 | 1.0 |
| Days with Min Temp Below Freezing | 7.0 | 4.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | < 0.5 | 2.0 | 5.0 | 19.0 |
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| Seattle C.O. Heating and Cooling |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Heating Degree Days | 735 | 580 | 570 | 438 | 276 | 123 | 44.0 | 58.0 | 144 | 357 | 561 | 725 | 4611 |
| Cooling Degree Days | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 15.0 | 54.0 | 80.0 | 18.0 | 0.0 | 0.0 | 0.0 | 167 |
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| Seattle C.O. Precipitation |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Precipitation (inches) | 5.4 | 4.0 | 3.8 | 2.5 | 1.8 | 1.6 | 0.9 | 1.2 | 1.9 | 3.3 | 5.7 | 6.0 | 38.0 |
| Days with Precipitation 0.01 inch or More | 18.0 | 15.0 | 17.0 | 14.0 | 11.0 | 9.0 | 5.0 | 6.0 | 8.0 | 11.0 | 18.0 | 18.0 | 151 |
| Monthly Snowfall (inches) | 2.9 | 0.9 | 0.6 | 0.0 | < 0.05 | 0.0 | 0.0 | 0.0 | 0.0 | < 0.05 | 0.7 | 2.2 | 7.3 |
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| Other Seattle C.O. Weather Indicators |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Average Wind Speed | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Clear Days | 3.0 | 3.0 | 4.0 | 5.0 | 7.0 | 7.0 | 12.0 | 10.0 | 9.0 | 5.0 | 3.0 | 3.0 | 71.0 |
| Partly Cloudy Days | 5.0 | 6.0 | 8.0 | 9.0 | 10.0 | 8.0 | 10.0 | 10.0 | 8.0 | 8.0 | 6.0 | 5.0 | 93.0 |
| Cloudy Days | 23.0 | 19.0 | 19.0 | 16.0 | 14.0 | 15.0 | 9.0 | 11.0 | 13.0 | 18.0 | 21.0 | 23.0 | 201 |
| Percent of Possible Sunshine | 28.0 | 34.0 | 42.0 | 47.0 | 52.0 | 49.0 | 63.0 | 56.0 | 53.0 | 37.0 | 28.0 | 23.0 | 43.0 |
| Avg. Relative Humidity | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Weather information for other cities in Washington