Custer weather in December: Custer, South Dakota: normal highs, lows, rain and records for December
Custer in December has a normal high of 35°F and a normal low of 16°F, a daily mean of 25°F, falling from 37°F on the 1st to 35°F by the 31st. Measurable precipitation falls on 6 days in a normal December, 0.48 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 2°C and low of −9°C, 12 mm of precipitation in December.
- NOAA stationCuster County Airport
- Station IDUSW00094032
- Location43.73°N 103.61°W
- Elevation5,545 ft (1,690 m)
- Population1,829
- Jan 35° 15°
- Feb 35° 15°
- Mar 44° 22°
- Apr 50° 29°
- May 60° 38°
- Jun 71° 47°
- Jul 79° 54°
- Aug 78° 52°
- Sep 69° 43°
- Oct 54° 32°
- Nov 43° 22°
- Dec 35° 16°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Custer in December?
The normal high is 35°F and the normal low 16°F, for a daily mean of 25.2°F. December is 7.4°F cooler than November and 0.1°F warmer than January. December is the 10th warmest month of the year in Custer and the 11th wettest. Across the month the normal high falls 2°F, from 37°F on December 1 to 35°F on December 31. From one year to the next December's mean temperature typically moves about 3.8°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 21°F and 29°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 19%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 37°F | 18°F | 18% | 4% |
| December 8 | 35°F | 16°F | 19% | 5% |
| December 15 | 34°F | 15°F | 19% | 5% |
| December 22 | 34°F | 15°F | 18% | 5% |
| December 31 | 35°F | 15°F | 18% | 5% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 18)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 37°F | 18°F | 18% | 4% | 9 h 10 min |
| December 2 | 37°F | 17°F | 18% | 4% | 9 h 10 min |
| December 3 | 36°F | 17°F | 18% | 5% | 9 h 10 min |
| December 4 | 36°F | 17°F | 18% | 5% | 9 h 10 min |
| December 5 | 36°F | 17°F | 19% | 5% | 9 h 10 min |
| December 6 | 36°F | 16°F | 19% | 5% | 9 h |
| December 7 | 35°F | 16°F | 19% | 5% | 9 h |
| December 8 | 35°F | 16°F | 19% | 5% | 9 h |
| December 9 | 35°F | 16°F | 19% | 5% | 9 h |
| December 10 | 35°F | 16°F | 19% | 5% | 9 h |
| December 11 | 35°F | 16°F | 19% | 5% | 9 h |
| December 12 | 35°F | 15°F | 19% | 5% | 9 h |
| December 13 | 34°F | 15°F | 19% | 5% | 9 h |
| December 14 | 34°F | 15°F | 19% | 5% | 9 h |
| December 15 | 34°F | 15°F | 19% | 5% | 9 h |
| December 16 | 34°F | 15°F | 19% | 5% | 9 h |
| December 17 | 34°F | 15°F | 19% | 5% | 9 h |
| December 18 | 34°F | 15°F | 19% | 5% | 9 h |
| December 19 | 34°F | 15°F | 18% | 5% | 9 h |
| December 20 | 34°F | 15°F | 18% | 5% | 9 h |
| December 21 | 34°F | 15°F | 18% | 5% | 9 h |
| December 22 | 34°F | 15°F | 18% | 5% | 9 h |
| December 23 | 35°F | 15°F | 18% | 5% | 9 h |
| December 24 | 35°F | 15°F | 18% | 5% | 9 h |
| December 25 | 35°F | 15°F | 18% | 5% | 9 h |
| December 26 | 35°F | 15°F | 18% | 5% | 9 h |
| December 27 | 35°F | 15°F | 18% | 5% | 9 h |
| December 28 | 35°F | 15°F | 18% | 5% | 9 h |
| December 29 | 35°F | 15°F | 18% | 5% | 9 h |
| December 30 | 35°F | 15°F | 18% | 5% | 9 h |
| December 31 | 35°F | 15°F | 18% | 5% | 9 h |
- Normal high
- 35°FDecember average
- Normal low
- 16°FDecember average
- Precipitation
- 0.48 inmonth total
- Days with precipitation
- 60.01 inch or more
- Nights at 32°F or colder
- 30
- Daylight
- 9 h 10 min to 9 hDecember 1 to December 31
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094032; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Custer in December?
On a given December day the chance of 0.01 inch or more is 18% on average, highest around December 7 (19%). In all, 0.48 in falls on 6 days of a normal December.
In a normal December in Custer, 30 nights fall to freezing and 12 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094032.
How humid and windy is Custer in December?
At 3 p.m. the normal temperature is 31°F with 44% relative humidity and a dew point of 12°F; at 6 a.m. it is 20°F with 62% humidity. The wind averages 6.9 mph, most often from the west-northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 20°F | 10°F | 62% | 6.3 mph | – |
| 9 a.m. | 24°F | 11°F | 56% | 6.5 mph | – |
| noon | 31°F | 12°F | 44% | 9.2 mph | – |
| 3 p.m. | 31°F | 12°F | 44% | 8.7 mph | – |
| 6 p.m. | 24°F | 11°F | 57% | 5.8 mph | – |
| 9 p.m. | 22°F | 10°F | 61% | 5.8 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094032. 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 Custer?
The warmest December temperature on this station's record (since 1999) is 63°F, on December 12, 2014; the coldest is −33°F, on December 22, 2022. The wettest December brought 1.35 in (2018).
The December mean against the 1991-2020 normal of 25.2°F: 2021 27.3°F (+2.1), 2022 21.9°F (−3.3), 2023 32.7°F (+7.5), 2024 33.0°F (+7.8), 2025 32.7°F (+7.5). 4 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 27.3°F | +2.1°F | 0.90 in |
| 2022 | 21.9°F | −3.3°F | 0.31 in |
| 2023 | 32.7°F | +7.5°F | 0.32 in |
| 2024 | 33.0°F | +7.8°F | 0.06 in |
| 2025 | 32.7°F | +7.5°F | 0.33 in |
Source: records: ACIS, station USW00094032; recent months: ACIS, station USW00094032. Records and recent months use complete months only.
How does December in Custer compare across South Dakota?
Across the 100 places PlainClimate covers in South Dakota, December normal highs run from 25°F in Eureka to 41°F in Hill City; Custer's is 35°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.