| Daily Summary |
| | Actual | Average (KSEA) | Record (KSEA) |
| Temperature |
| Mean Temperature |
°F
|
42°F
|
|
| Max Temperature |
37°F
|
47°F
|
55°F
(1977) |
| Min Temperature |
28°F
|
37°F
|
15°F
(1950) |
| Degree Days |
| Heating Degree Days |
32 |
23 |
|
| Month to date heating degree days |
|
399 |
|
| Since 1 July heating degree days |
|
2337 |
|
| Cooling Degree Days |
0 |
0 |
|
| Month to date cooling degree days |
|
0 |
|
| Year to date cooling degree days |
|
0 |
|
| Moisture |
| Dew Point |
31°F
| | |
| Average Humidity |
90 |
|
|
| Maximum Humidity |
100 |
|
|
| Minimum Humidity |
83 |
|
|
| Precipitation |
| Precipitation |
0.00 in
|
0.19 in
|
2.39 in
(2005) |
| Month to date precipitation |
|
3.22 |
|
| Year to date precipitation |
|
3.22 |
|
| Snow |
| Snow |
0.00 in
|
in
|
5.70 in
(1954) |
| Month to date snowfall |
|
|
|
| Since 1 July snowfall |
|
|
|
| Snow Depth |
in
|
| |
| Wind |
| Wind Speed |
1 mph
| | |
| Max Wind Speed |
6 mph
| | |
| Max Gust Speed |
mph
| | |
| Visibility |
1 miles
| | |
| Events |
Fog
| | |
|
| Key: T is trace of precipitation, MM is missing value |
|
Source: NWS Daily Summary |
