Belleville weather in December: Belleville, Illinois: normal highs, lows, rain and records for December
Belleville in December has a normal high of 46°F and a normal low of 28°F, a daily mean of 37°F, falling from 51°F on the 1st to 43°F by the 31st. Measurable precipitation falls on 8 days in a normal December, 2.61 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 8°C and low of −2°C, 66 mm of precipitation and 7 cm of snow in December.
- NOAA stationBelleville Siu Research
- Station IDUSW00013802
- Location38.52°N 89.85°W
- Elevation450 ft (137 m)
- From the center8 miles
- Population40,560
- Jan 43° 24°
- Feb 49° 28°
- Mar 59° 36°
- Apr 71° 46°
- May 79° 56°
- Jun 87° 65°
- Jul 90° 68°
- Aug 89° 65°
- Sep 83° 57°
- Oct 73° 47°
- Nov 58° 37°
- Dec 46° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Belleville in December?
The normal high is 46°F and the normal low 28°F, for a daily mean of 37.3°F. December is 10.2°F cooler than November and 3.7°F warmer than January. December is the 11th warmest month of the year in Belleville and the 10th wettest. Across the month the normal high falls 8°F, from 51°F on December 1 to 43°F on December 31. From one year to the next December's mean temperature typically moves about 4.1°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 33°F and 41°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 25%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 51°F | 32°F | 25% | 19% |
| December 8 | 48°F | 30°F | 25% | 18% |
| December 15 | 46°F | 28°F | 25% | 18% |
| December 22 | 44°F | 27°F | 24% | 17% |
| December 31 | 43°F | 25°F | 23% | 16% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 51°F | 32°F | 25% | 19% | 9 h 40 min |
| December 2 | 51°F | 32°F | 25% | 18% | 9 h 40 min |
| December 3 | 50°F | 31°F | 25% | 18% | 9 h 40 min |
| December 4 | 50°F | 31°F | 25% | 18% | 9 h 40 min |
| December 5 | 50°F | 31°F | 25% | 18% | 9 h 40 min |
| December 6 | 49°F | 31°F | 25% | 18% | 9 h 40 min |
| December 7 | 49°F | 30°F | 25% | 18% | 9 h 40 min |
| December 8 | 48°F | 30°F | 25% | 18% | 9 h 30 min |
| December 9 | 48°F | 30°F | 25% | 18% | 9 h 30 min |
| December 10 | 48°F | 30°F | 25% | 18% | 9 h 30 min |
| December 11 | 47°F | 29°F | 25% | 18% | 9 h 30 min |
| December 12 | 47°F | 29°F | 25% | 18% | 9 h 30 min |
| December 13 | 47°F | 29°F | 25% | 18% | 9 h 30 min |
| December 14 | 47°F | 29°F | 25% | 18% | 9 h 30 min |
| December 15 | 46°F | 28°F | 25% | 18% | 9 h 30 min |
| December 16 | 46°F | 28°F | 25% | 17% | 9 h 30 min |
| December 17 | 46°F | 28°F | 25% | 17% | 9 h 30 min |
| December 18 | 45°F | 28°F | 24% | 17% | 9 h 30 min |
| December 19 | 45°F | 28°F | 24% | 17% | 9 h 30 min |
| December 20 | 45°F | 27°F | 24% | 17% | 9 h 30 min |
| December 21 | 45°F | 27°F | 24% | 17% | 9 h 30 min |
| December 22 | 44°F | 27°F | 24% | 17% | 9 h 30 min |
| December 23 | 44°F | 27°F | 24% | 17% | 9 h 30 min |
| December 24 | 44°F | 27°F | 24% | 17% | 9 h 30 min |
| December 25 | 44°F | 26°F | 24% | 17% | 9 h 30 min |
| December 26 | 44°F | 26°F | 24% | 16% | 9 h 30 min |
| December 27 | 44°F | 26°F | 23% | 16% | 9 h 30 min |
| December 28 | 43°F | 26°F | 23% | 16% | 9 h 30 min |
| December 29 | 43°F | 26°F | 23% | 16% | 9 h 30 min |
| December 30 | 43°F | 26°F | 23% | 16% | 9 h 30 min |
| December 31 | 43°F | 25°F | 23% | 16% | 9 h 30 min |
- Normal high
- 46°FDecember average
- Normal low
- 28°FDecember average
- Precipitation
- 2.61 inmonth total
- Days with precipitation
- 80.01 inch or more
- Snowfall
- 2.9 inmonth total
- Nights at 32°F or colder
- 21
- Daylight
- 9 h 40 min to 9 h 30 minDecember 1 to December 31
- Sunshine
- 64%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013802; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Belleville in December?
On a given December day the chance of 0.01 inch or more is 24% on average, highest around December 1 (25%). In all, 2.61 in falls on 8 days of a normal December, 1 of them with an inch or more.
In a normal December in Belleville, 21 nights fall to freezing, 4 days stay below freezing all day and snowfall averages 2.9 inches.
Snow falls on 2 days in a normal December, and an inch or more covers the ground on 3 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013802.
How humid and windy is Belleville in December?
At 3 p.m. the normal temperature is 39°F with 63% relative humidity and a dew point of 27°F; at 6 a.m. it is 28°F with 85% humidity. The wind averages 8.5 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 28°F | 24°F | 85% | 7.3 mph | 45% |
| 9 a.m. | 31°F | 26°F | 81% | 8.9 mph | 37% |
| noon | 37°F | 27°F | 67% | 10.5 mph | 39% |
| 3 p.m. | 39°F | 27°F | 63% | 10.4 mph | 41% |
| 6 p.m. | 35°F | 27°F | 73% | 8.2 mph | 44% |
| 9 p.m. | 32°F | 26°F | 79% | 7.9 mph | 48% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013802. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for December in Belleville?
The warmest December temperature on this station's record (since 1948) is 78°F, on December 28, 2025; the coldest is −19°F, on December 22, 1989. The wettest December brought 9.35 in (1982); the snowiest, 16.0 inches (1973).
The December mean against the 1991-2020 normal of 37.3°F: 2021 43.8°F (+6.5), 2022 33.9°F (−3.4), 2024 37.2°F (−0.1), 2025 37.5°F (+0.2). 2 of 4 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 43.8°F | +6.5°F | 2.87 in |
| 2022 | 33.9°F | −3.4°F | 2.43 in |
| 2024 | 37.2°F | −0.1°F | – |
| 2025 | 37.5°F | +0.2°F | – |
Source: records: ACIS, station USW00013802; recent months: ACIS, station USW00013802. Records and recent months use complete months only.
How does December in Belleville compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, December normal highs run from 33°F in Galena to 48°F in Anna; Belleville's is 46°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.