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Decatur, Alabama climate
Cfa Humid subtropical
Decatur has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 32°C, while the coldest is January averaging around 0°C at night. Precipitation is fairly even year-round, totalling about 1257 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 countsDecatur climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 13 | 18 | 23 | 27 | 31 | 32 | 32 | 30 | 24 | 17 | 12 |
| Avg temp (°C) | 5 | 7 | 12 | 16 | 21 | 25 | 27 | 26 | 23 | 17 | 10 | 7 |
| Avg low (°C) | 0 | 2 | 5 | 10 | 15 | 19 | 21 | 20 | 16 | 10 | 4 | 1 |
| Precipitation (mm) | 118 | 126 | 126 | 114 | 105 | 93 | 100 | 77 | 82 | 82 | 101 | 132 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 13 | 18 | 23 | 27 | 31 |
| Avg temp (°C) | 5 | 7 | 12 | 16 | 21 | 25 |
| Avg low (°C) | 0 | 2 | 5 | 10 | 15 | 19 |
| Precipitation (mm) | 118 | 126 | 126 | 114 | 105 | 93 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 32 | 30 | 24 | 17 | 12 |
| Avg temp (°C) | 27 | 26 | 23 | 17 | 10 | 7 |
| Avg low (°C) | 21 | 20 | 16 | 10 | 4 | 1 |
| Precipitation (mm) | 100 | 77 | 82 | 82 | 101 | 132 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 10 | 10 | 10 | 10 | 10 | 11 | 10 | 8 | 8 | 9 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 3 | 13 | 17 | 17 | 9 | 0.7 | — | — |
| Days with low ≤ 0°C (days) | 16 | 12 | 6 | 0.6 | 0.2 | 0.1 | — | — | 0.0 | 1 | 8 | 15 |
| Days with snowfall ≥ 2.5 cm (days) | — | 0.1 | — | — | — | — | — | — | 0.0 | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 10 | 10 | 10 | 10 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 3 | 13 |
| Days with low ≤ 0°C (days) | 16 | 12 | 6 | 0.6 | 0.2 | 0.1 |
| Days with snowfall ≥ 2.5 cm (days) | — | 0.1 | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 8 | 8 | 9 | 10 |
| Days with high ≥ 32°C (days) | 17 | 17 | 9 | 0.7 | — | — |
| Days with low ≤ 0°C (days) | — | — | 0.0 | 1 | 8 | 15 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | 0.0 | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 66 | 62 | 57 | 56 | 56 | 56 | 52 | 49 | 46 | 53 | 63 |
| Clear days (≤ 30% cloud) | 6 | 5 | 7 | 8 | 8 | 8 | 7 | 9 | 11 | 13 | 9 | 7 |
| Partly cloudy days (30–70%) | 9 | 8 | 10 | 10 | 10 | 11 | 13 | 12 | 10 | 9 | 9 | 9 |
| Cloudy days (≥ 70%) | 16 | 15 | 15 | 12 | 13 | 11 | 11 | 10 | 10 | 10 | 12 | 16 |
| Relative humidity (%) | 85 | 84 | 82 | 80 | 79 | 75 | 72 | 69 | 68 | 71 | 76 | 84 |
| Wind speed (m/s) | 1.4 | 1.4 | 1.4 | 1.3 | 1.0 | 0.9 | 0.8 | 0.8 | 1.0 | 1.0 | 1.1 | 1.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 66 | 62 | 57 | 56 | 56 |
| Clear days (≤ 30% cloud) | 6 | 5 | 7 | 8 | 8 | 8 |
| Partly cloudy days (30–70%) | 9 | 8 | 10 | 10 | 10 | 11 |
| Cloudy days (≥ 70%) | 16 | 15 | 15 | 12 | 13 | 11 |
| Relative humidity (%) | 85 | 84 | 82 | 80 | 79 | 75 |
| Wind speed (m/s) | 1.4 | 1.4 | 1.4 | 1.3 | 1.0 | 0.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 52 | 49 | 46 | 53 | 63 |
| Clear days (≤ 30% cloud) | 7 | 9 | 11 | 13 | 9 | 7 |
| Partly cloudy days (30–70%) | 13 | 12 | 10 | 9 | 9 | 9 |
| Cloudy days (≥ 70%) | 11 | 10 | 10 | 10 | 12 | 16 |
| Relative humidity (%) | 72 | 69 | 68 | 71 | 76 | 84 |
| Wind speed (m/s) | 0.8 | 0.8 | 1.0 | 1.0 | 1.1 | 1.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Decatur Pryor Fld (NOAA GHCN station USW00053852), about 7 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.