| Daily Summary |
| | Actual | Average (KSEA) | Record (KSEA) |
| Temperature |
| Mean Temperature |
°F
|
42°F
|
|
| Max Temperature |
35°F
|
47°F
|
59°F
(1986) |
| Min Temperature |
19°F
|
37°F
|
13°F
(1963) |
| Degree Days |
| Heating Degree Days |
38 |
23 |
|
| Month to date heating degree days |
|
284 |
|
| Since 1 July heating degree days |
|
2222 |
|
| Cooling Degree Days |
0 |
0 |
|
| Month to date cooling degree days |
|
0 |
|
| Year to date cooling degree days |
|
0 |
|
| Moisture |
| Dew Point |
23°F
| | |
| Average Humidity |
91 |
|
|
| Maximum Humidity |
100 |
|
|
| Minimum Humidity |
60 |
|
|
| Precipitation |
| Precipitation |
0.00 in
|
0.19 in
|
1.30 in
(1975) |
| Month to date precipitation |
|
2.27 |
|
| Year to date precipitation |
|
2.27 |
|
| Snow |
| Snow |
0.00 in
|
in
|
1.80 in
(1969) |
| Month to date snowfall |
|
|
|
| Since 1 July snowfall |
|
|
|
| Snow Depth |
in
|
| |
| Wind |
| Wind Speed |
0 mph
| | |
| Max Wind Speed |
5 mph
| | |
| Max Gust Speed |
mph
| | |
| Visibility |
10 miles
| | |
| Events |
| | |
|
| Key: T is trace of precipitation, MM is missing value |
|
Source: NWS Daily Summary |
