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 | 41.3 | 44.3 | 46.6 | 50.4 | 56.1 | 61.4 | 65.3 | 65.7 | 60.8 | 53.5 | 46.3 | 41.6 | 52.8 |
| Avg. Max Temperature | 46.1 | 50.6 | 53.7 | 58.1 | 64.2 | 69.6 | 74.1 | 74.1 | 68.8 | 60.0 | 51.5 | 46.2 | 59.8 |
| Avg. Min Temperature | 36.4 | 38.0 | 39.5 | 42.7 | 47.9 | 53.2 | 56.4 | 57.2 | 52.9 | 46.9 | 41.0 | 37.0 | 45.8 |
| Days with Max Temp of 90 F 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