| Daily Summary |
| | Actual | Average (KSEA) | Record (KSEA) |
| Temperature |
| Mean Temperature |
°F
|
44°F
|
|
| Max Temperature |
51°F
|
49°F
|
59°F
(1974) |
| Min Temperature |
41°F
|
38°F
|
14°F
(2010) |
| Degree Days |
| Heating Degree Days |
19 |
21 |
|
| Month to date heating degree days |
|
453 |
|
| Since 1 July heating degree days |
|
1050 |
|
| Cooling Degree Days |
0 |
0 |
|
| Month to date cooling degree days |
|
0 |
|
| Year to date cooling degree days |
|
189 |
|
| Moisture |
| Dew Point |
42°F
| | |
| Average Humidity |
86 |
|
|
| Maximum Humidity |
97 |
|
|
| Minimum Humidity |
67 |
|
|
| Precipitation |
| Precipitation |
0.00 in
|
0.23 in
|
2.93 in
(1990) |
| Month to date precipitation |
|
5.25 |
|
| Year to date precipitation |
|
30.82 |
|
| Snow |
| Snow |
0.00 in
|
in
|
0.20 in
(1958) |
| 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 |
8 miles
| | |
| Events |
Fog
, Rain
| | |
|
| Key: T is trace of precipitation, MM is missing value |
|
Source: NWS Daily Summary |
