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| |source 1 = NOAA (relative humidity, dew point and sun 1961–1990)<ref name = NOWData1b>{{cite web | |source 1 = NOAA (relative humidity, dew point and sun 1961–1990)<ref name = NOWData1b>{{cite web | ||
| |url = https:// |
|url = https://www.weather.gov/wrh/Climate?wfo=sew | ||
| |title = NowData – NOAA Online Weather Data | |title = NowData – NOAA Online Weather Data | ||
| |publisher = ] | |publisher = ] | ||
Latest revision as of 07:35, 26 November 2024
 | This template needs to be updated. The reason given is: Some of this data is more than five years old; parts are more than 10 years old. Please help update this template to reflect recent events or newly available information. Relevant discussion may be found on the talk page. (November 2024) |
| Climate data for Seattle (SeaTac Airport), 1991–2020 normals, extremes 1894–present | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 67 (19) |
70 (21) |
79 (26) |
89 (32) |
93 (34) |
108 (42) |
103 (39) |
99 (37) |
98 (37) |
89 (32) |
74 (23) |
66 (19) |
108 (42) |
| Mean maximum °F (°C) | 57.0 (13.9) |
59.1 (15.1) |
66.4 (19.1) |
74.3 (23.5) |
81.9 (27.7) |
85.8 (29.9) |
91.2 (32.9) |
89.9 (32.2) |
84.1 (28.9) |
72.0 (22.2) |
61.6 (16.4) |
56.8 (13.8) |
94.1 (34.5) |
| Mean daily maximum °F (°C) | 48.0 (8.9) |
50.3 (10.2) |
54.2 (12.3) |
59.3 (15.2) |
66.3 (19.1) |
71.1 (21.7) |
77.4 (25.2) |
77.6 (25.3) |
71.6 (22.0) |
60.5 (15.8) |
52.1 (11.2) |
47.0 (8.3) |
61.3 (16.3) |
| Daily mean °F (°C) | 42.8 (6.0) |
44.0 (6.7) |
47.1 (8.4) |
51.3 (10.7) |
57.5 (14.2) |
62.0 (16.7) |
67.1 (19.5) |
67.4 (19.7) |
62.6 (17.0) |
53.8 (12.1) |
46.5 (8.1) |
42.0 (5.6) |
53.7 (12.1) |
| Mean daily minimum °F (°C) | 37.7 (3.2) |
37.7 (3.2) |
39.9 (4.4) |
43.3 (6.3) |
48.7 (9.3) |
53.0 (11.7) |
56.8 (13.8) |
57.2 (14.0) |
53.6 (12.0) |
47.0 (8.3) |
40.9 (4.9) |
37.1 (2.8) |
46.1 (7.8) |
| Mean minimum °F (°C) | 26.1 (−3.3) |
27.3 (−2.6) |
31.3 (−0.4) |
35.6 (2.0) |
40.6 (4.8) |
46.6 (8.1) |
51.5 (10.8) |
51.7 (10.9) |
45.8 (7.7) |
36.8 (2.7) |
29.2 (−1.6) |
25.4 (−3.7) |
21.5 (−5.8) |
| Record low °F (°C) | 0 (−18) |
1 (−17) |
11 (−12) |
29 (−2) |
28 (−2) |
38 (3) |
43 (6) |
44 (7) |
35 (2) |
28 (−2) |
6 (−14) |
6 (−14) |
0 (−18) |
| Average precipitation inches (mm) | 5.78 (147) |
3.76 (96) |
4.17 (106) |
3.18 (81) |
1.88 (48) |
1.45 (37) |
0.60 (15) |
0.97 (25) |
1.61 (41) |
3.91 (99) |
6.31 (160) |
5.72 (145) |
39.34 (999) |
| Average snowfall inches (cm) | 1.8 (4.6) |
2.2 (5.6) |
0.4 (1.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.2 (0.51) |
1.7 (4.3) |
6.3 (16) |
| Average precipitation days (≥ 0.01 in) | 18.7 | 15.9 | 17.1 | 15.0 | 11.3 | 9.2 | 4.7 | 4.9 | 8.3 | 14.3 | 18.4 | 18.4 | 156.2 |
| Average snowy days (≥ 0.1 in) | 1.4 | 1.2 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 1.5 | 4.7 |
| Average relative humidity (%) | 78.0 | 75.2 | 73.6 | 71.4 | 68.9 | 67.1 | 65.4 | 68.2 | 73.2 | 78.6 | 79.8 | 80.1 | 73.3 |
| Average dew point °F (°C) | 33.1 (0.6) |
35.1 (1.7) |
36.3 (2.4) |
38.8 (3.8) |
43.5 (6.4) |
48.2 (9.0) |
51.4 (10.8) |
52.7 (11.5) |
50.2 (10.1) |
45.1 (7.3) |
38.8 (3.8) |
34.3 (1.3) |
42.3 (5.7) |
| Mean monthly sunshine hours | 69.8 | 108.8 | 178.4 | 207.3 | 253.7 | 268.4 | 312.0 | 281.4 | 221.7 | 142.6 | 72.7 | 52.9 | 2,169.7 |
| Percent possible sunshine | 25 | 38 | 48 | 51 | 54 | 56 | 65 | 64 | 59 | 42 | 26 | 20 | 49 |
| Average ultraviolet index | 1 | 2 | 3 | 5 | 6 | 7 | 7 | 6 | 5 | 3 | 1 | 1 | 4 |
| Source 1: NOAA (relative humidity, dew point and sun 1961–1990) | |||||||||||||
| Source 2: Weather Atlas (UV) | |||||||||||||
Notes
- Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1991 to 2020.
- Official records are restricted to SeaTac Airport from January 1945 onward.
References
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 27, 2021.
- "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Retrieved May 20, 2021.
- "WMO Climate Normals for Seattle/Seattle–Tacoma INTL A, WA 1961–1990". National Oceanic and Atmospheric Administration. Archived from the original on 2023-06-27. Retrieved July 18, 2020.
- "Seattle, WA - Detailed climate information and monthly weather forecast". Weather Atlas. Yu Media Group. Retrieved January 1, 2020.