December is one of the cooler months of the year in Rexburg, with average highs near -2.6°C and lows around -12.2°C (mean -7.4°C). It is a relatively wet time of year, averaging 59 mm of rainfall and 88% relative humidity across the period.
December is one of the cooler months of the year in Rexburg. Across 45 years of records, the warmest December in Rexburg was 2025 — when the month averaged -1°C — while the coldest was 1990 at -12.1°C. Typical December days reach -2.6°C with nights near -12.2°C. The long-term trend is warming, about 0.8°C per decade.
December is a relatively wet time of year in Rexburg, averaging 59 mm of rainfall. The wettest December on record was 1996 with 133 mm, while the driest was 1986 at 7 mm.
Relative humidity in Rexburg during December averages 88%. The most humid December was 1985 at 96%, and the least humid was 1986 at 79%.
December receives about 1.4 kWh/m²/day of solar energy in Rexburg. The sunniest December was 2011 at 1.9 kWh/m²/day, and the cloudiest was 2021 at 1.
Average wind speed in Rexburg during December is 2 m/s. The windiest December was 1996 at 2.8 m/s, while the calmest was 1986 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -8.6°C | -8.0°C | -7.2°C | -7.6°C | -4.6°C | +4°C |
| Avg High | -3.6°C | -3.3°C | -2.5°C | -2.7°C | -0.2°C | +3.4°C |
| Avg Low | -13.6°C | -12.7°C | -11.9°C | -12.5°C | -9.0°C | +4.6°C |
| Avg Rain | 44 mm | 56 mm | 64 mm | 66 mm | 67 mm | +22 mm |
December temperatures in Rexburg have risen by about 5.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -35.5°C (1983) to a record high of 9.5°C (1995).
Rainfall in December is a relatively wet time of year, averaging 59 mm, with a wettest year of 133 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.7°C per decade while lows rose 0.9°C per decade, narrowing the gap between day and night.
A quieter season to visit Rexburg
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Rexburg. That said, December — with days averaging -2.6°C and nights around -12.2°C (mean -7.4°C) and moderate rainfall (59 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 2.9°C | -1.0°C | -4.8°C | 8.9°C | -13.2°C | 115 mm | 83% | 2.7 m/s | — |
| 2024 | 1.4°C | -2.6°C | -6.6°C | 5.4°C | -13.9°C | 62 mm | 84% | 1.7 m/s | 1.5 |
| 2023 | 0.7°C | -3.6°C | -7.9°C | 5.4°C | -15.3°C | 41 mm | 86% | 1.7 m/s | 1.6 |
| 2022 | -4.2°C | -9.3°C | -14.5°C | 1.3°C | -34.9°C | 71 mm | 94% | 2 m/s | 1.6 |
| 2021 | -0.9°C | -5.1°C | -9.4°C | 8.3°C | -20.9°C | 78 mm | 85% | 2.6 m/s | 1 |
| 2020 | -0.8°C | -5.8°C | -10.9°C | 3.7°C | -18.6°C | 33 mm | 82% | 1.8 m/s | 1.6 |
| 2019 | -2.6°C | -7.2°C | -11.8°C | 2.4°C | -19.4°C | 49 mm | 91% | 1.6 m/s | 1.2 |
| 2018 | -3.4°C | -8.6°C | -13.7°C | 0.9°C | -23.2°C | 44 mm | 91% | 1.9 m/s | 1.3 |
| 2017 | -2.1°C | -6.9°C | -11.7°C | 4.0°C | -23.9°C | 48 mm | 87% | 1.7 m/s | 1.4 |
| 2016 | -6.2°C | -11.7°C | -17.1°C | 0.4°C | -32.9°C | 119 mm | 94% | 2 m/s | 1.3 |
| 2015 | -2.6°C | -7.3°C | -11.9°C | 6.9°C | -23.0°C | 74 mm | 90% | 2.2 m/s | 1.4 |
| 2014 | -0.2°C | -4.7°C | -9.2°C | 9.4°C | -29.3°C | 76 mm | 89% | 2.1 m/s | 1.4 |
| 2013 | -3.7°C | -8.6°C | -13.4°C | 4.0°C | -20.7°C | 43 mm | 83% | 2.4 m/s | 1.5 |
| 2012 | -2.0°C | -7.0°C | -12.1°C | 7.5°C | -21.9°C | 84 mm | 88% | 2.3 m/s | 1.2 |
| 2011 | -2.1°C | -7.3°C | -12.4°C | 4.8°C | -21.7°C | 33 mm | 84% | 2 m/s | 1.9 |
| 2010 | -2.4°C | -7.2°C | -11.9°C | 0.8°C | -26.4°C | 89 mm | 94% | 1.9 m/s | 1.2 |
| 2009 | -4.5°C | -9.5°C | -14.4°C | 0.9°C | -22.3°C | 36 mm | 84% | 2 m/s | 1.4 |
| 2008 | -2.9°C | -7.9°C | -12.9°C | 5.0°C | -24.4°C | 84 mm | 82% | 2.4 m/s | 1.2 |
| 2007 | -3.9°C | -8.7°C | -13.4°C | 2.2°C | -22.0°C | 73 mm | 90% | 2.2 m/s | 1.1 |
| 2006 | -1.7°C | -6.5°C | -11.2°C | 3.9°C | -19.9°C | 57 mm | 85% | 2 m/s | 1.6 |
| 2005 | -4.1°C | -8.7°C | -13.3°C | 2.2°C | -29.0°C | 92 mm | 93% | 1.8 m/s | 1.5 |
| 2004 | -1.2°C | -5.6°C | -10.0°C | 2.4°C | -27.7°C | 64 mm | 90% | 2 m/s | 1.4 |
| 2003 | -0.7°C | -5.2°C | -9.8°C | 4.6°C | -23.6°C | 88 mm | 88% | 2.2 m/s | 1.3 |
| 2002 | 0.5°C | -3.8°C | -8.0°C | 6.3°C | -16.1°C | 50 mm | 86% | 1.9 m/s | 1.2 |
| 2001 | -4.7°C | -9.4°C | -14.2°C | 0.5°C | -20.0°C | 64 mm | 95% | 1.7 m/s | 1.4 |
| 2000 | -2.2°C | -7.2°C | -12.2°C | 2.3°C | -20.1°C | 30 mm | 87% | 1.7 m/s | 1.4 |
| 1999 | -1.7°C | -6.3°C | -11.0°C | 3.5°C | -18.2°C | 48 mm | 86% | 1.8 m/s | 1.4 |
| 1998 | -3.0°C | -7.1°C | -11.2°C | 5.7°C | -29.4°C | 44 mm | 83% | 2.4 m/s | 1.1 |
| 1997 | -2.5°C | -7.3°C | -12.2°C | 2.2°C | -19.7°C | 30 mm | 86% | 1.9 m/s | 1.6 |
| 1996 🌧️ | -3.4°C | -7.6°C | -11.8°C | 1.4°C | -29.2°C | 133 mm | 95% | 2.8 m/s | 1.1 |
| 1995 | -1.5°C | -6.1°C | -10.7°C | 9.5°C | -17.8°C | 57 mm | 87% | 1.9 m/s | 1.5 |
| 1994 | -3.3°C | -7.4°C | -11.6°C | 3.1°C | -25.2°C | 67 mm | 93% | 1.7 m/s | 1.5 |
| 1993 | -2.7°C | -7.6°C | -12.6°C | 2.9°C | -19.9°C | 30 mm | 88% | 1.9 m/s | 1.4 |
| 1992 | -5.4°C | -10.5°C | -15.6°C | 0.4°C | -25.1°C | 79 mm | 95% | 2.2 m/s | 1.3 |
| 1991 | -2.7°C | -8.0°C | -13.3°C | 1.7°C | -23.6°C | 28 mm | 89% | 1.6 m/s | 1.6 |
| 1990 ❄️ | -7.0°C | -12.1°C | -17.1°C | 5.6°C | -32.3°C | 41 mm | 83% | 2 m/s | 1.6 |
| 1989 | -1.1°C | -6.4°C | -11.7°C | 4.3°C | -23.6°C | 14 mm | 83% | 1.6 m/s | 1.4 |
| 1988 | -5.0°C | -10.0°C | -15.0°C | 0.5°C | -25.0°C | 45 mm | 91% | 1.8 m/s | 1.3 |
| 1987 | -1.7°C | -6.5°C | -11.2°C | 7.4°C | -24.5°C | 43 mm | 82% | 2.2 m/s | 1.3 |
| 1986 | -0.7°C | -5.6°C | -10.6°C | 4.1°C | -17.7°C | 7 mm | 79% | 1.4 m/s | 1.5 |
| 1985 | -6.0°C | -10.6°C | -15.2°C | 1.6°C | -26.2°C | 32 mm | 96% | 1.5 m/s | 1.5 |
| 1984 | -5.1°C | -10.8°C | -16.5°C | 1.3°C | -23.9°C | 39 mm | 91% | 2 m/s | 1.7 |
| 1983 | -6.6°C | -11.8°C | -16.9°C | 0.9°C | -35.5°C | 73 mm | 94% | 1.8 m/s | — |
| 1982 | -4.3°C | -9.0°C | -13.6°C | 0.8°C | -26.5°C | 75 mm | 93% | 2.2 m/s | — |
| 1981 | -1.8°C | -6.6°C | -11.3°C | 6.3°C | -22.5°C | 74 mm | 90% | 2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -2.6°C with lows near -12.2°C (mean -7.4°C), based on 45 years of NASA POWER data.
December averages 59 mm of rainfall in Rexburg, a relatively wet time of year. The wettest on record was 133 mm in 1996.
The hottest December reached 9.5°C in 1995. The coldest dipped to -35.5°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 5.5°C. Daytime highs moved from -4.8°C to 0°C and overnight lows from -14.7°C to -8.6°C over the same span.
December is one of the cooler months of the year in Rexburg and a relatively wet time of year, so plan for around -2.6°C daytime highs and -12.2°C at night.
Not quite — December is the 2nd coolest month in Rexburg, averaging -7.4°C.
For December in Rexburg, pack warm layers and a jacket for chilly mornings, with typical highs of -2.6°C and lows of -12.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 88% — quite humid.
Average wind speed in December is 2 m/s. The windiest December on record averaged 2.8 m/s (1996).
The wettest December on record was 1996 with 133 mm. On average, December sees 59 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Rexburg behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
