Quincy weather in December: Quincy, Illinois: normal highs, lows, rain and records for December
Quincy in December has a normal high of 39°F and a normal low of 24°F, a daily mean of 32°F, falling from 44°F on the 1st to 35°F by the 31st. Measurable precipitation falls on 7 days in a normal December, 1.80 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 4°C and low of −5°C, 46 mm of precipitation in December.
- NOAA stationQuincy Regional Airport
- Station IDUSW00093989
- Location39.94°N 91.19°W
- Elevation769 ft (234 m)
- From the center10 miles
- Population38,786
- Jan 35° 19°
- Feb 40° 23°
- Mar 52° 32°
- Apr 64° 43°
- May 73° 54°
- Jun 82° 63°
- Jul 86° 67°
- Aug 85° 65°
- Sep 78° 56°
- Oct 65° 45°
- Nov 51° 33°
- Dec 39° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Quincy in December?
The normal high is 39°F and the normal low 24°F, for a daily mean of 31.6°F. December is 10.7°F cooler than November and 5.0°F warmer than January. December is the 10th warmest month of the year in Quincy and the 10th wettest. Across the month the normal high falls 9°F, from 44°F on December 1 to 35°F on December 31. From one year to the next December's mean temperature typically moves about 4.6°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 27°F and 36°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 26%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 44°F | 28°F | 26% | 14% |
| December 8 | 42°F | 26°F | 25% | 13% |
| December 15 | 39°F | 24°F | 25% | 13% |
| December 22 | 37°F | 22°F | 24% | 13% |
| December 31 | 35°F | 20°F | 24% | 12% |
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 | 44°F | 28°F | 26% | 14% | 9 h 30 min |
| December 2 | 44°F | 28°F | 26% | 14% | 9 h 30 min |
| December 3 | 44°F | 27°F | 25% | 14% | 9 h 30 min |
| December 4 | 43°F | 27°F | 25% | 14% | 9 h 30 min |
| December 5 | 43°F | 27°F | 25% | 14% | 9 h 30 min |
| December 6 | 42°F | 26°F | 25% | 14% | 9 h 30 min |
| December 7 | 42°F | 26°F | 25% | 14% | 9 h 30 min |
| December 8 | 42°F | 26°F | 25% | 13% | 9 h 30 min |
| December 9 | 41°F | 26°F | 25% | 13% | 9 h 30 min |
| December 10 | 41°F | 25°F | 25% | 13% | 9 h 20 min |
| December 11 | 41°F | 25°F | 25% | 13% | 9 h 20 min |
| December 12 | 40°F | 25°F | 25% | 13% | 9 h 20 min |
| December 13 | 40°F | 25°F | 25% | 13% | 9 h 20 min |
| December 14 | 40°F | 24°F | 25% | 13% | 9 h 20 min |
| December 15 | 39°F | 24°F | 25% | 13% | 9 h 20 min |
| December 16 | 39°F | 24°F | 25% | 13% | 9 h 20 min |
| December 17 | 39°F | 24°F | 24% | 13% | 9 h 20 min |
| December 18 | 38°F | 23°F | 24% | 13% | 9 h 20 min |
| December 19 | 38°F | 23°F | 24% | 13% | 9 h 20 min |
| December 20 | 38°F | 23°F | 24% | 13% | 9 h 20 min |
| December 21 | 38°F | 23°F | 24% | 13% | 9 h 20 min |
| December 22 | 37°F | 22°F | 24% | 13% | 9 h 20 min |
| December 23 | 37°F | 22°F | 24% | 13% | 9 h 20 min |
| December 24 | 37°F | 22°F | 24% | 13% | 9 h 20 min |
| December 25 | 37°F | 22°F | 24% | 12% | 9 h 20 min |
| December 26 | 36°F | 21°F | 24% | 12% | 9 h 20 min |
| December 27 | 36°F | 21°F | 24% | 12% | 9 h 20 min |
| December 28 | 36°F | 21°F | 24% | 12% | 9 h 20 min |
| December 29 | 36°F | 21°F | 24% | 12% | 9 h 20 min |
| December 30 | 36°F | 21°F | 24% | 12% | 9 h 20 min |
| December 31 | 35°F | 20°F | 24% | 12% | 9 h 20 min |
- Normal high
- 39°FDecember average
- Normal low
- 24°FDecember average
- Precipitation
- 1.80 inmonth total
- Days with precipitation
- 70.01 inch or more
- Nights at 32°F or colder
- 25
- Daylight
- 9 h 30 min to 9 h 20 minDecember 1 to December 31
- Sunshine
- 65%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093989; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Quincy in December?
On a given December day the chance of 0.01 inch or more is 25% on average, highest around December 1 (26%). In all, 1.80 in falls on 7 days of a normal December, 1 of them with an inch or more.
In a normal December in Quincy, 25 nights fall to freezing and 9 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093989.
What are the records for December in Quincy?
The warmest December temperature on Quincy's official record (since 1901) is 75°F, on December 15, 2021; the coldest is −22°F, on December 22, 1989. The wettest December brought 8.62 in (1982); the snowiest, 17.0 inches (1915).
The December mean against the 1991-2020 normal of 31.6°F: 2021 40.4°F (+8.8), 2022 30.3°F (−1.3), 2023 40.3°F (+8.7), 2024 35.3°F (+3.7), 2025 30.9°F (−0.8). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 40.4°F | +8.8°F | 1.32 in |
| 2022 | 30.3°F | −1.3°F | 1.65 in |
| 2023 | 40.3°F | +8.7°F | 2.26 in |
| 2024 | 35.3°F | +3.7°F | 2.47 in |
| 2025 | 30.9°F | −0.8°F | 0.88 in |
Source: records: ACIS, NWS threaded record UINthr; recent months: ACIS, station USW00093989. Records and recent months use complete months only.
How does December in Quincy 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; Quincy's is 39°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.