January is one of the cooler months of the year in Twin Falls, with average highs near 2.6°C and lows around -6.3°C (mean -1.8°C). It is about average for rainfall, averaging 37 mm of rainfall and 79% relative humidity across the period.
January is one of the cooler months of the year in Twin Falls. Across 45 years of records, the warmest January in Twin Falls was 2003 — when the month averaged 3.2°C — while the coldest was 2017 at -7.2°C. Typical January days reach 2.6°C with nights near -6.3°C. The long-term trend is warming, about 0.2°C per decade.
January is about average for rainfall in Twin Falls, averaging 37 mm of rainfall. The wettest January on record was 2012 with 97 mm, while the driest was 1992 at 8 mm.
Relative humidity in Twin Falls during January averages 79%. The most humid January was 1984 at 91%, and the least humid was 2014 at 66%.
January receives about 1.9 kWh/m²/day of solar energy in Twin Falls. The sunniest Januarys were 1985 and 2007 at 2.4 kWh/m²/day, and the cloudiest were 2000 and 2017 at 1.6.
Average wind speed in Twin Falls during January is 3 m/s. The windiest January was 2008 at 3.9 m/s, while the calmest were 1985 and 2015 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -2.7°C | -1.4°C | -1.8°C | -2.0°C | -1.3°C | +1.4°C |
| Avg High | 1.8°C | 3.1°C | 2.7°C | 2.5°C | 2.9°C | +1.1°C |
| Avg Low | -7.2°C | -6.0°C | -6.3°C | -6.5°C | -5.6°C | +1.6°C |
| Avg Rain | 21 mm | 41 mm | 34 mm | 50 mm | 37 mm | +17 mm |
January temperatures in Twin Falls have risen by about 1.2°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -26°C (2017) to a record high of 17.8°C (2003).
Rainfall in January is about average for rainfall, averaging 37 mm, with a wettest year of 97 mm.
A quieter season to visit Twin Falls
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Twin Falls. That said, January — with days averaging 2.6°C and nights around -6.3°C (mean -1.8°C) and moderate rainfall (37 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 | 2.4°C | -1.9°C | -6.2°C | 8.1°C | -13.8°C | 20 mm | 73% | 2.7 m/s | 2.2 |
| 2024 | 2.4°C | -1.7°C | -5.9°C | 14.0°C | -18.3°C | 60 mm | 86% | 3.2 m/s | 1.8 |
| 2023 | 2.2°C | -2.0°C | -6.3°C | 8.2°C | -19.0°C | 32 mm | 79% | 3.2 m/s | 1.8 |
| 2022 | 1.6°C | -2.6°C | -6.9°C | 5.5°C | -20.0°C | 36 mm | 82% | 2.5 m/s | 2 |
| 2021 | 4.6°C | 0.2°C | -4.1°C | 8.2°C | -8.4°C | 23 mm | 72% | 2.8 m/s | 2 |
| 2020 | 4.3°C | 0.2°C | -4.0°C | 9.2°C | -9.8°C | 53 mm | 78% | 3.5 m/s | 1.7 |
| 2019 | 3.3°C | -1.4°C | -6.1°C | 9.7°C | -15.9°C | 38 mm | 81% | 3.2 m/s | 2.2 |
| 2018 | 5.9°C | 1.5°C | -2.9°C | 11.3°C | -7.2°C | 42 mm | 77% | 2.9 m/s | 1.8 |
| 2017 ❄️ | -2.4°C | -7.2°C | -12.0°C | 2.6°C | -26.0°C | 88 mm | 89% | 2.6 m/s | 1.6 |
| 2016 | 1.3°C | -3.1°C | -7.5°C | 6.0°C | -21.5°C | 60 mm | 87% | 3 m/s | 1.8 |
| 2015 | 4.3°C | 0.0°C | -4.3°C | 10.7°C | -16.5°C | 29 mm | 85% | 2.2 m/s | 1.9 |
| 2014 | 4.9°C | 0.4°C | -4.1°C | 8.9°C | -9.3°C | 30 mm | 66% | 3.1 m/s | 2.2 |
| 2013 | -1.8°C | -6.3°C | -10.7°C | 7.8°C | -18.4°C | 34 mm | 88% | 3 m/s | 2.1 |
| 2012 🌧️ | 4.4°C | -0.1°C | -4.6°C | 11.2°C | -12.2°C | 97 mm | 68% | 3.2 m/s | 2 |
| 2011 | 1.9°C | -2.6°C | -7.1°C | 8.6°C | -19.8°C | 34 mm | 84% | 2.8 m/s | 2 |
| 2010 | 3.5°C | -0.9°C | -5.4°C | 8.6°C | -15.1°C | 47 mm | 79% | 2.9 m/s | 1.9 |
| 2009 | 3.0°C | -1.4°C | -5.8°C | 7.7°C | -16.1°C | 39 mm | 79% | 3.4 m/s | 2 |
| 2008 | -0.3°C | -5.5°C | -10.7°C | 5.2°C | -19.4°C | 47 mm | 83% | 3.9 m/s | 2 |
| 2007 | 0.8°C | -4.0°C | -8.9°C | 7.8°C | -18.6°C | 14 mm | 76% | 2.7 m/s | 2.4 |
| 2006 | 3.5°C | -0.4°C | -4.4°C | 7.2°C | -8.2°C | 69 mm | 81% | 3.6 m/s | 1.8 |
| 2005 | 3.3°C | -1.0°C | -5.4°C | 9.1°C | -11.0°C | 31 mm | 84% | 2.4 m/s | 1.9 |
| 2004 | 0.7°C | -3.6°C | -7.9°C | 7.2°C | -18.2°C | 26 mm | 85% | 2.8 m/s | 1.8 |
| 2003 🔥 | 8.0°C | 3.2°C | -1.6°C | 17.8°C | -5.6°C | 16 mm | 75% | 2.3 m/s | 2 |
| 2002 | 1.0°C | -3.0°C | -7.1°C | 5.7°C | -15.5°C | 32 mm | 81% | 2.8 m/s | 1.8 |
| 2001 | 3.0°C | -1.9°C | -6.7°C | 7.3°C | -11.8°C | 15 mm | 73% | 2.6 m/s | 2 |
| 2000 | 4.1°C | -0.1°C | -4.3°C | 13.6°C | -10.0°C | 47 mm | 77% | 3.1 m/s | 1.6 |
| 1999 | 4.1°C | -0.2°C | -4.5°C | 9.4°C | -11.6°C | 51 mm | 74% | 3.5 m/s | 1.9 |
| 1998 | 5.1°C | 0.6°C | -3.8°C | 10.5°C | -9.0°C | 67 mm | 78% | 3.2 m/s | 1.7 |
| 1997 | 1.7°C | -2.5°C | -6.7°C | 8.6°C | -18.3°C | 66 mm | 84% | 3.3 m/s | 1.7 |
| 1996 | 2.0°C | -2.2°C | -6.4°C | 9.4°C | -20.7°C | 48 mm | 81% | 3.5 m/s | 1.7 |
| 1995 | 3.8°C | -0.6°C | -4.9°C | 10.1°C | -14.3°C | 55 mm | 80% | 3.2 m/s | 1.8 |
| 1994 | 5.6°C | 1.0°C | -3.5°C | 13.3°C | -9.9°C | 17 mm | 71% | 3.2 m/s | 1.9 |
| 1993 | -0.8°C | -5.6°C | -10.5°C | 5.1°C | -17.9°C | 30 mm | 86% | 2.9 m/s | 2.2 |
| 1992 | 4.1°C | -0.9°C | -5.9°C | 13.7°C | -10.4°C | 8 mm | 73% | 2.7 m/s | 2 |
| 1991 | 1.6°C | -3.3°C | -8.3°C | 9.6°C | -15.4°C | 22 mm | 75% | 2.7 m/s | 2.2 |
| 1990 | 3.7°C | -0.7°C | -5.1°C | 13.8°C | -10.8°C | 45 mm | 75% | 3.5 m/s | 1.9 |
| 1989 | 0.6°C | -4.2°C | -9.0°C | 7.6°C | -14.4°C | 20 mm | 84% | 3.1 m/s | 1.8 |
| 1988 | 0.9°C | -3.7°C | -8.3°C | 9.3°C | -15.7°C | 28 mm | 79% | 2.9 m/s | 1.9 |
| 1987 | 1.8°C | -3.0°C | -7.7°C | 13.2°C | -17.5°C | 29 mm | 74% | 2.8 m/s | 1.9 |
| 1986 | 5.0°C | 0.4°C | -4.1°C | 13.0°C | -10.8°C | 30 mm | 79% | 3 m/s | 1.9 |
| 1985 | 0.3°C | -4.3°C | -8.9°C | 7.1°C | -18.0°C | 10 mm | 81% | 2.2 m/s | 2.4 |
| 1984 | -1.3°C | -5.5°C | -9.8°C | 5.7°C | -23.3°C | 9 mm | 91% | 2.3 m/s | 1.9 |
| 1983 | 4.4°C | 0.4°C | -3.6°C | 8.8°C | -13.2°C | 20 mm | 81% | 2.9 m/s | — |
| 1982 | -1.4°C | -5.6°C | -9.9°C | 4.5°C | -23.8°C | 24 mm | 88% | 3.8 m/s | — |
| 1981 | 5.9°C | 1.1°C | -3.8°C | 13.5°C | -7.9°C | 16 mm | 70% | 2.5 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 2.6°C with lows near -6.3°C (mean -1.8°C), based on 45 years of NASA POWER data.
January averages 37 mm of rainfall in Twin Falls, about average for rainfall. The wettest on record was 97 mm in 2012.
The hottest January reached 17.8°C in 2003. The coldest dipped to -26°C in 2017.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1.2°C. Daytime highs moved from 1.6°C to 2.6°C and overnight lows from -7.2°C to -5.9°C over the same span.
January is one of the cooler months of the year in Twin Falls and about average for rainfall, so plan for around 2.6°C daytime highs and -6.3°C at night.
Yes — January is the coldest month of the year in Twin Falls, averaging -1.8°C.
For January in Twin Falls, pack warm layers and a jacket for chilly mornings, with typical highs of 2.6°C and lows of -6.3°C.
Relative humidity in January averages 79% — quite humid.
Average wind speed in January is 3 m/s. The windiest January on record averaged 3.9 m/s (2008).
The wettest January on record was 2012 with 97 mm. On average, January sees 37 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 Twin Falls behaves each January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
