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Denison, Texas climate
Cfa Humid subtropical
Denison has a 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 1°C at night. Around 1125 mm of precipitation falls each year, peaking in May (141 mm) and easing off in January (64 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 countsDenison climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 14 | 18 | 23 | 27 | 31 | 34 | 34 | 30 | 24 | 17 | 12 |
| Avg temp (°C) | 6 | 8 | 13 | 17 | 22 | 26 | 28 | 28 | 24 | 18 | 12 | 7 |
| Avg low (°C) | 1 | 3 | 7 | 12 | 16 | 21 | 23 | 23 | 19 | 13 | 7 | 2 |
| Precipitation (mm) | 64 | 70 | 101 | 98 | 141 | 115 | 74 | 73 | 87 | 121 | 89 | 92 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 14 | 18 | 23 | 27 | 31 |
| Avg temp (°C) | 6 | 8 | 13 | 17 | 22 | 26 |
| Avg low (°C) | 1 | 3 | 7 | 12 | 16 | 21 |
| Precipitation (mm) | 64 | 70 | 101 | 98 | 141 | 115 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 34 | 30 | 24 | 17 | 12 |
| Avg temp (°C) | 28 | 28 | 24 | 18 | 12 | 7 |
| Avg low (°C) | 23 | 23 | 19 | 13 | 7 | 2 |
| Precipitation (mm) | 74 | 73 | 87 | 121 | 89 | 92 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 6 | 8 | 7 | 9 | 7 | 5 | 5 | 6 | 7 | 6 | 7 |
| Days with high ≥ 32°C (days) | — | 0.1 | 0.0 | 0.1 | 2 | 13 | 23 | 23 | 10 | 0.8 | — | — |
| Days with low ≤ 0°C (days) | 14 | 10 | 3 | 0.4 | 0.0 | — | — | — | — | 0.2 | 3 | 12 |
| Days with snowfall ≥ 2.5 cm (days) | 0.1 | 0.1 | — | — | — | — | — | — | — | — | 0.1 | 0.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 6 | 8 | 7 | 9 | 7 |
| Days with high ≥ 32°C (days) | — | 0.1 | 0.0 | 0.1 | 2 | 13 |
| Days with low ≤ 0°C (days) | 14 | 10 | 3 | 0.4 | 0.0 | — |
| Days with snowfall ≥ 2.5 cm (days) | 0.1 | 0.1 | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 5 | 6 | 7 | 6 | 7 |
| Days with high ≥ 32°C (days) | 23 | 23 | 10 | 0.8 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.2 | 3 | 12 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | 0.1 | 0.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 59 | 59 | 56 | 59 | 48 | 41 | 42 | 42 | 44 | 50 | 55 |
| Clear days (≤ 30% cloud) | 9 | 7 | 8 | 8 | 8 | 10 | 14 | 12 | 13 | 13 | 10 | 9 |
| Partly cloudy days (30–70%) | 9 | 8 | 9 | 10 | 9 | 12 | 11 | 12 | 9 | 9 | 9 | 9 |
| Cloudy days (≥ 70%) | 13 | 13 | 14 | 12 | 14 | 8 | 7 | 7 | 8 | 9 | 11 | 13 |
| Relative humidity (%) | 76 | 75 | 74 | 72 | 74 | 70 | 61 | 59 | 64 | 67 | 72 | 76 |
| Wind speed (km/h) | 12.0 | 12.6 | 13.3 | 13.4 | 12.0 | 10.7 | 10.0 | 9.2 | 9.6 | 11.2 | 11.8 | 11.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 59 | 59 | 56 | 59 | 48 |
| Clear days (≤ 30% cloud) | 9 | 7 | 8 | 8 | 8 | 10 |
| Partly cloudy days (30–70%) | 9 | 8 | 9 | 10 | 9 | 12 |
| Cloudy days (≥ 70%) | 13 | 13 | 14 | 12 | 14 | 8 |
| Relative humidity (%) | 76 | 75 | 74 | 72 | 74 | 70 |
| Wind speed (km/h) | 12.0 | 12.6 | 13.3 | 13.4 | 12.0 | 10.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 41 | 42 | 42 | 44 | 50 | 55 |
| Clear days (≤ 30% cloud) | 14 | 12 | 13 | 13 | 10 | 9 |
| Partly cloudy days (30–70%) | 11 | 12 | 9 | 9 | 9 | 9 |
| Cloudy days (≥ 70%) | 7 | 7 | 8 | 9 | 11 | 13 |
| Relative humidity (%) | 61 | 59 | 64 | 67 | 72 | 76 |
| Wind speed (km/h) | 10.0 | 9.2 | 9.6 | 11.2 | 11.8 | 11.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Sherman (NOAA GHCN station USC00418274), about 11 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.