| Daily Summary |
| | Actual | Average (KSEA) | Record (KSEA) |
| Temperature |
| Mean Temperature |
°F
|
41°F
|
|
| Max Temperature |
45°F
|
46°F
|
60°F
(1993) |
| Min Temperature |
37°F
|
36°F
|
18°F
(2009) |
| Degree Days |
| Heating Degree Days |
24 |
24 |
|
| Month to date heating degree days |
|
212 |
|
| Since 1 July heating degree days |
|
1395 |
|
| Cooling Degree Days |
0 |
0 |
|
| Month to date cooling degree days |
|
0 |
|
| Year to date cooling degree days |
|
189 |
|
| Moisture |
| Dew Point |
39°F
| | |
| Average Humidity |
89 |
|
|
| Maximum Humidity |
96 |
|
|
| Minimum Humidity |
79 |
|
|
| Precipitation |
| Precipitation |
0.06 in
|
0.17 in
|
1.78 in
(1956) |
| Month to date precipitation |
|
1.70 |
|
| Year to date precipitation |
|
33.84 |
|
| Snow |
| Snow |
0.00 in
|
in
|
T in
(1978) |
| Month to date snowfall |
|
|
|
| Since 1 July snowfall |
|
|
|
| Snow Depth |
in
|
| |
| Wind |
| Wind Speed |
4 mph
| | |
| Max Wind Speed |
9 mph
| | |
| Max Gust Speed |
mph
| | |
| Visibility |
6 miles
| | |
| Events |
Rain
| | |
|
| Key: T is trace of precipitation, MM is missing value |
|
Source: NWS Daily Summary |
