| Daily Summary |
| | Actual | Average (KSEA) | Record (KSEA) |
| Temperature |
| Mean Temperature |
°F
|
42°F
|
|
| Max Temperature |
57°F
|
48°F
|
59°F
(1999) |
| Min Temperature |
48°F
|
37°F
|
18°F
(2006) |
| Degree Days |
| Heating Degree Days |
12 |
23 |
|
| Month to date heating degree days |
|
564 |
|
| Since 1 July heating degree days |
|
1161 |
|
| Cooling Degree Days |
0 |
0 |
|
| Month to date cooling degree days |
|
0 |
|
| Year to date cooling degree days |
|
189 |
|
| Growing Degree Days | 2 (Base
°F
) | | |
| Moisture |
| Dew Point |
42°F
| | |
| Average Humidity |
66 |
|
|
| Maximum Humidity |
86 |
|
|
| Minimum Humidity |
51 |
|
|
| Precipitation |
| Precipitation |
0.07 in
|
0.23 in
|
1.08 in
(1964) |
| Month to date precipitation |
|
6.35 |
|
| Year to date precipitation |
|
31.92 |
|
| Snow |
| Snow |
0.00 in
|
in
|
1.00 in
(2006) |
| Month to date snowfall |
|
|
|
| Since 1 July snowfall |
|
|
|
| Snow Depth |
in
|
| |
| Wind |
| Wind Speed |
4 mph
| | |
| Max Wind Speed |
13 mph
| | |
| Max Gust Speed |
24 mph
| | |
| Visibility |
10 miles
| | |
| Events |
Rain
| | |
|
| Key: T is trace of precipitation, MM is missing value |
|
Source: NWS Daily Summary |
