Climate averages 1991–2020
Decatur weather
in February.
A cold, moderately wet month: the 10th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
February is a cold month in Decatur: daytime highs average 4.6°C and nights cool to about -4.7°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 59 mm of rain on roughly 8 days, which makes February a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 10 h 40 min on an average February day.
The nearest other city in this atlas is Springfield (Illinois), United States (59 km away). In February its highs average 4.7°C, about as warm as Decatur, with 57 mm of rain.
Among the 498 cities listed in the United States, Decatur ranks joint 368th of 498 for the warmest February highs and joint 190th of 498 for the driest February (rainfall, lowest first). The mean February high of those 498 cities is 11.1°C; Decatur is 6.5°C cooler than that mean.
From February to March, average highs rise by 6.1°C to 10.7°C, and monthly rainfall rises from 59 mm to 83 mm.
The annual picture
February in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Decatur climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.8°C-6.3°C | -6.3°C | 69 | 8.5 | 9.710 h |
| February, selected | 4.6°C-4.7°C | -4.7°C | 59 | 7.6 | 10.711 h |
| March | 10.7°C0.7°C | 0.7°C | 83 | 9.7 | 11.912 h |
| April | 17.2°C6.7°C | 6.7°C | 118 | 11.7 | 13.213 h |
| May | 22.5°C12.8°C | 12.8°C | 122 | 13.2 | 14.414 h |
| June | 27.1°C17.9°C | 17.9°C | 110 | 10.9 | 14.915 h |
| July | 28.8°C19.9°C | 19.9°C | 91 | 10.3 | 14.715 h |
| August | 28.3°C19.3°C | 19.3°C | 77 | 8.4 | 13.714 h |
| September | 25.0°C15.4°C | 15.4°C | 82 | 7.3 | 12.512 h |
| October | 18.2°C9.1°C | 9.1°C | 88 | 8.6 | 11.211 h |
| November | 10.5°C2.3°C | 2.3°C | 88 | 8.7 | 10.010 h |
| December | 4.3°C-3.1°C | -3.1°C | 63 | 8.7 | 9.49 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
February in nearby cities
- Springfield (Illinois), United States in FebruaryUnited States · 59 kmHigh 4.7°C · Low -4.6°C · 57 mm rain
- Champaign in FebruaryUnited States · 68 kmHigh 4.1°C · Low -5.2°C · 59 mm rain
- Bloomington (Illinois), United States in FebruaryUnited States · 72 kmHigh 3.4°C · Low -5.6°C · 54 mm rain
- Peoria (Illinois), United States in FebruaryUnited States · 109 kmHigh 3.4°C · Low -5.6°C · 53 mm rain
- St. Louis in FebruaryUnited States · 172 kmHigh 7.2°C · Low -2.5°C · 63 mm rain
- Lafayette (Indiana), United States in FebruaryUnited States · 188 kmHigh 3.7°C · Low -5.4°C · 59 mm rain
- O'Fallon in FebruaryUnited States · 189 kmHigh 6.8°C · Low -2.6°C · 61 mm rain
- Joliet in FebruaryUnited States · 201 kmHigh 2.4°C · Low -6.5°C · 51 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Decatur) is explained once on the Decatur year overview and on the Sources, method and limits page.