| Daily Summary |
| | Actual | Average (KSEA) | Record (KSEA) |
| Temperature |
| Mean Temperature |
°F
|
43°F
|
|
| Max Temperature |
48°F
|
48°F
|
58°F
(2003) |
| Min Temperature |
41°F
|
37°F
|
9°F
(1957) |
| Degree Days |
| Heating Degree Days |
20 |
22 |
|
| Month to date heating degree days |
|
600 |
|
| Since 1 July heating degree days |
|
2538 |
|
| Cooling Degree Days |
0 |
0 |
|
| Month to date cooling degree days |
|
0 |
|
| Year to date cooling degree days |
|
0 |
|
| Moisture |
| Dew Point |
37°F
| | |
| Average Humidity |
78 |
|
|
| Maximum Humidity |
89 |
|
|
| Minimum Humidity |
63 |
|
|
| Precipitation |
| Precipitation |
0.16 in
|
0.16 in
|
1.03 in
(1950) |
| Month to date precipitation |
|
4.78 |
|
| Year to date precipitation |
|
4.78 |
|
| Snow |
| Snow |
0.00 in
|
in
|
10.00 in
(1950) |
| Month to date snowfall |
|
|
|
| Since 1 July snowfall |
|
|
|
| Snow Depth |
in
|
| |
| Wind |
| Wind Speed |
8 mph
| | |
| Max Wind Speed |
14 mph
| | |
| Max Gust Speed |
22 mph
| | |
| Visibility |
9 miles
| | |
| Events |
Rain
| | |
|
| Key: T is trace of precipitation, MM is missing value |
|
Source: NWS Daily Summary |
