Home › Cities › United States › Oklahoma › Stillwater
Stillwater, Oklahoma climate
Cfa Humid subtropical
Stillwater has a strongly seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 34°C, while the coldest is January averaging around −4°C at night. Around 915 mm of precipitation falls each year, peaking in May (120 mm) and easing off in January (34 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsStillwater climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 12 | 17 | 22 | 26 | 31 | 34 | 34 | 29 | 23 | 16 | 10 |
| Avg temp (°C) | 3 | 5 | 10 | 15 | 20 | 25 | 28 | 27 | 23 | 16 | 9 | 4 |
| Avg low (°C) | −4 | −1 | 4 | 8 | 14 | 20 | 22 | 21 | 16 | 9 | 3 | −2 |
| Precipitation (mm) | 34 | 40 | 70 | 105 | 120 | 118 | 87 | 93 | 75 | 75 | 58 | 42 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 12 | 17 | 22 | 26 | 31 |
| Avg temp (°C) | 3 | 5 | 10 | 15 | 20 | 25 |
| Avg low (°C) | −4 | −1 | 4 | 8 | 14 | 20 |
| Precipitation (mm) | 34 | 40 | 70 | 105 | 120 | 118 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 34 | 29 | 23 | 16 | 10 |
| Avg temp (°C) | 28 | 27 | 23 | 16 | 9 | 4 |
| Avg low (°C) | 22 | 21 | 16 | 9 | 3 | −2 |
| Precipitation (mm) | 87 | 93 | 75 | 75 | 58 | 42 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 7 | 7 | 9 | 12 | 10 | 7 | 9 | 7 | 8 | 6 | 6 |
| Days with high ≥ 32°C (days) | — | — | 0.2 | 1 | 4 | 15 | 23 | 21 | 10 | 1 | — | — |
| Days with low ≤ 0°C (days) | 23 | 18 | 8 | 2 | 0.1 | — | — | — | — | 1 | 10 | 22 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 7 | 7 | 9 | 12 | 10 |
| Days with high ≥ 32°C (days) | — | — | 0.2 | 1 | 4 | 15 |
| Days with low ≤ 0°C (days) | 23 | 18 | 8 | 2 | 0.1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 9 | 7 | 8 | 6 | 6 |
| Days with high ≥ 32°C (days) | 23 | 21 | 10 | 1 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 1 | 10 | 22 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 54 | 58 | 60 | 57 | 57 | 49 | 42 | 44 | 45 | 46 | 49 | 54 |
| Clear days (≤ 30% cloud) | 9 | 7 | 7 | 7 | 8 | 10 | 13 | 12 | 12 | 13 | 11 | 9 |
| Partly cloudy days (30–70%) | 10 | 10 | 10 | 10 | 10 | 12 | 11 | 11 | 10 | 9 | 10 | 10 |
| Cloudy days (≥ 70%) | 12 | 12 | 14 | 13 | 13 | 9 | 7 | 7 | 8 | 9 | 10 | 12 |
| Relative humidity (%) | 74 | 72 | 70 | 68 | 72 | 70 | 63 | 60 | 63 | 65 | 71 | 75 |
| Wind speed (km/h) | 12.1 | 12.6 | 13.7 | 13.9 | 12.1 | 11.2 | 10.0 | 9.5 | 10.3 | 11.8 | 12.2 | 11.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 54 | 58 | 60 | 57 | 57 | 49 |
| Clear days (≤ 30% cloud) | 9 | 7 | 7 | 7 | 8 | 10 |
| Partly cloudy days (30–70%) | 10 | 10 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 12 | 12 | 14 | 13 | 13 | 9 |
| Relative humidity (%) | 74 | 72 | 70 | 68 | 72 | 70 |
| Wind speed (km/h) | 12.1 | 12.6 | 13.7 | 13.9 | 12.1 | 11.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 44 | 45 | 46 | 49 | 54 |
| Clear days (≤ 30% cloud) | 13 | 12 | 12 | 13 | 11 | 9 |
| Partly cloudy days (30–70%) | 11 | 11 | 10 | 9 | 10 | 10 |
| Cloudy days (≥ 70%) | 7 | 7 | 8 | 9 | 10 | 12 |
| Relative humidity (%) | 63 | 60 | 63 | 65 | 71 | 75 |
| Wind speed (km/h) | 10.0 | 9.5 | 10.3 | 11.8 | 12.2 | 11.4 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Stillwater 2 W (NOAA GHCN station USW00053926), about 3 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.