| Daily Summary |
| | Actual | Average (KSEA) | Record (KSEA) |
| Temperature |
| Mean Temperature |
°F
|
40°F
|
|
| Max Temperature |
42°F
|
45°F
|
63°F
(1980) |
| Min Temperature |
30°F
|
35°F
|
19°F
(2008) |
| Degree Days |
| Heating Degree Days |
29 |
25 |
|
| Month to date heating degree days |
|
360 |
|
| Since 1 July heating degree days |
|
1543 |
|
| Cooling Degree Days |
0 |
0 |
|
| Month to date cooling degree days |
|
0 |
|
| Year to date cooling degree days |
|
189 |
|
| Moisture |
| Dew Point |
33°F
| | |
| Average Humidity |
82 |
|
|
| Maximum Humidity |
93 |
|
|
| Minimum Humidity |
73 |
|
|
| Precipitation |
| Precipitation |
0.24 in
|
0.16 in
|
1.60 in
(1959) |
| Month to date precipitation |
|
2.70 |
|
| Year to date precipitation |
|
34.84 |
|
| Snow |
| Snow |
0.00 in
|
in
|
1.20 in
(1979) |
| Month to date snowfall |
|
|
|
| Since 1 July snowfall |
|
|
|
| Snow Depth |
in
|
| |
| Wind |
| Wind Speed |
7 mph
| | |
| Max Wind Speed |
10 mph
| | |
| Max Gust Speed |
20 mph
| | |
| Visibility |
9 miles
| | |
| Events |
Rain
| | |
|
| Key: T is trace of precipitation, MM is missing value |
|
Source: NWS Daily Summary |
