Marshalltown weather in December: Marshalltown, Iowa: normal highs, lows, rain and records for December
Marshalltown in December has a normal high of 33°F and a normal low of 16°F, a daily mean of 24°F, falling from 39°F on the 1st to 29°F by the 31st. Measurable precipitation falls on 6 days in a normal December, 1.01 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 1°C and low of −9°C, 26 mm of precipitation in December.
- NOAA stationMarshalltown Municipal Airport
- Station IDUSW00094988
- Location42.11°N 92.92°W
- Elevation974 ft (297 m)
- From the center5 miles
- Population27,886
- Jan 28° 10°
- Feb 32° 14°
- Mar 46° 26°
- Apr 60° 37°
- May 71° 49°
- Jun 81° 59°
- Jul 83° 62°
- Aug 81° 60°
- Sep 75° 51°
- Oct 62° 39°
- Nov 46° 26°
- Dec 33° 16°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Marshalltown in December?
The normal high is 33°F and the normal low 16°F, for a daily mean of 24.3°F. December is 11.9°F cooler than November and 5.4°F warmer than January. December is the 10th warmest month of the year in Marshalltown and the 10th wettest. Across the month the normal high falls 10°F, from 39°F on December 1 to 29°F on December 31. From one year to the next December's mean temperature typically moves about 5.3°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 19°F and 30°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 22%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 39°F | 20°F | 22% | 10% |
| December 8 | 36°F | 18°F | 22% | 9% |
| December 15 | 33°F | 16°F | 21% | 8% |
| December 22 | 31°F | 14°F | 19% | 7% |
| December 31 | 29°F | 12°F | 18% | 6% |
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 | 39°F | 20°F | 22% | 10% | 9 h 20 min |
| December 2 | 38°F | 20°F | 22% | 9% | 9 h 20 min |
| December 3 | 38°F | 20°F | 22% | 9% | 9 h 20 min |
| December 4 | 37°F | 19°F | 22% | 9% | 9 h 20 min |
| December 5 | 37°F | 19°F | 22% | 9% | 9 h 20 min |
| December 6 | 37°F | 19°F | 22% | 9% | 9 h 20 min |
| December 7 | 36°F | 18°F | 22% | 9% | 9 h 10 min |
| December 8 | 36°F | 18°F | 22% | 9% | 9 h 10 min |
| December 9 | 35°F | 18°F | 22% | 9% | 9 h 10 min |
| December 10 | 35°F | 17°F | 21% | 9% | 9 h 10 min |
| December 11 | 35°F | 17°F | 21% | 8% | 9 h 10 min |
| December 12 | 34°F | 17°F | 21% | 8% | 9 h 10 min |
| December 13 | 34°F | 16°F | 21% | 8% | 9 h 10 min |
| December 14 | 33°F | 16°F | 21% | 8% | 9 h 10 min |
| December 15 | 33°F | 16°F | 21% | 8% | 9 h 10 min |
| December 16 | 33°F | 16°F | 21% | 8% | 9 h 10 min |
| December 17 | 32°F | 15°F | 20% | 8% | 9 h 10 min |
| December 18 | 32°F | 15°F | 20% | 8% | 9 h 10 min |
| December 19 | 32°F | 15°F | 20% | 8% | 9 h 10 min |
| December 20 | 31°F | 14°F | 20% | 8% | 9 h 10 min |
| December 21 | 31°F | 14°F | 20% | 7% | 9 h 10 min |
| December 22 | 31°F | 14°F | 19% | 7% | 9 h 10 min |
| December 23 | 30°F | 14°F | 19% | 7% | 9 h 10 min |
| December 24 | 30°F | 13°F | 19% | 7% | 9 h 10 min |
| December 25 | 30°F | 13°F | 19% | 7% | 9 h 10 min |
| December 26 | 30°F | 13°F | 19% | 7% | 9 h 10 min |
| December 27 | 29°F | 13°F | 19% | 7% | 9 h 10 min |
| December 28 | 29°F | 12°F | 18% | 7% | 9 h 10 min |
| December 29 | 29°F | 12°F | 18% | 7% | 9 h 10 min |
| December 30 | 29°F | 12°F | 18% | 6% | 9 h 10 min |
| December 31 | 29°F | 12°F | 18% | 6% | 9 h 10 min |
- Normal high
- 33°FDecember average
- Normal low
- 16°FDecember average
- Precipitation
- 1.01 inmonth total
- Days with precipitation
- 60.01 inch or more
- Nights at 32°F or colder
- 29
- Daylight
- 9 h 20 min to 9 h 10 minDecember 1 to December 31
- Sunshine
- 66%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094988; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Marshalltown in December?
On a given December day the chance of 0.01 inch or more is 20% on average, highest around December 1 (22%). In all, 1.01 in falls on 6 days of a normal December.
In a normal December in Marshalltown, 29 nights fall to freezing and 15 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094988.
What are the records for December in Marshalltown?
The warmest December temperature on this station's record (since 1996) is 73°F, on December 15, 2021; the coldest is −23°F, on December 25, 2000. The wettest December brought 4.51 in (2015).
The December mean against the 1991-2020 normal of 24.3°F: 2021 31.1°F (+6.8), 2022 22.4°F (−1.9), 2023 34.8°F (+10.5), 2024 29.5°F (+5.2), 2025 21.2°F (−3.1). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 31.1°F | +6.8°F | 0.71 in |
| 2022 | 22.4°F | −1.9°F | – |
| 2023 | 34.8°F | +10.5°F | 0.95 in |
| 2024 | 29.5°F | +5.2°F | 1.09 in |
| 2025 | 21.2°F | −3.1°F | 1.00 in |
Source: records: ACIS, station USW00094988; recent months: ACIS, station USW00094988. Records and recent months use complete months only.
How does December in Marshalltown compare across Iowa?
Across the 132 places PlainClimate covers in Iowa, December normal highs run from 27°F in Northwood to 38°F in Keokuk; Marshalltown's is 33°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.