| Daily Summary |
| | Actual | Average (KSEA) | Record (KSEA) |
| Temperature |
| Mean Temperature |
°F
|
66°F
|
|
| Max Temperature |
69°F
|
75°F
|
87°F
(1966) |
| Min Temperature |
57°F
|
56°F
|
47°F
(1952) |
| Degree Days |
| Heating Degree Days |
2 |
2 |
|
| Month to date heating degree days |
|
23 |
|
| Since 1 July heating degree days |
|
78 |
|
| Cooling Degree Days |
0 |
2 |
|
| Month to date cooling degree days |
|
44 |
|
| Year to date cooling degree days |
|
133 |
|
| Growing Degree Days | 12 (Base
°F
) | | |
| Moisture |
| Dew Point |
59°F
| | |
| Average Humidity |
83 |
|
|
| Maximum Humidity |
97 |
|
|
| Minimum Humidity |
60 |
|
|
| Precipitation |
| Precipitation |
0.50 in
|
0.03 in
|
0.11 in
(1997) |
| Month to date precipitation |
|
0.58 |
|
| Year to date precipitation |
|
20.29 |
|
| Wind |
| Wind Speed |
9 mph
| | |
| Max Wind Speed |
13 mph
| | |
| Max Gust Speed |
25 mph
| | |
| Visibility |
8 miles
| | |
| Events |
Rain
| | |
|
| Key: T is trace of precipitation, MM is missing value |
|
Source: NWS Daily Summary |