January is one of the cooler months of the year in Nampa, with average highs near 4°C and lows around -4.3°C (mean -0.1°C). It is a relatively wet time of year, averaging 41 mm of rainfall and 79% relative humidity across the period.
January is one of the cooler months of the year in Nampa. Across 45 years of records, the warmest January in Nampa was 2003 — when the month averaged 3.8°C — while the coldest was 2017 at -6°C. Typical January days reach 4°C with nights near -4.3°C. The long-term trend is warming, about 0.3°C per decade.
January is a relatively wet time of year in Nampa, averaging 41 mm of rainfall. The wettest January on record was 2017 with 88 mm, while the driest was 1985 at 5 mm.
Relative humidity in Nampa during January averages 79%. The most humid January was 2017 at 91%, and the least humid was 2012 at 67%.
January receives about 1.7 kWh/m²/day of solar energy in Nampa. The sunniest January was 2007 at 2.2 kWh/m²/day, and the cloudiest were 1990 and 2004 at 1.4.
Average wind speed in Nampa during January is 2.2 m/s. The windiest January was 2008 at 3 m/s, while the calmest was 1985 at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -1.5°C | 0.4°C | 0.1°C | -0.1°C | 0.6°C | +2.1°C |
| Avg High | 2.8°C | 4.5°C | 4.2°C | 4.0°C | 4.6°C | +1.8°C |
| Avg Low | -5.7°C | -3.7°C | -4.0°C | -4.2°C | -3.5°C | +2.2°C |
| Avg Rain | 31 mm | 48 mm | 36 mm | 43 mm | 47 mm | +17 mm |
January temperatures in Nampa have risen by about 1.9°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -25.1°C (2017) to a record high of 17.7°C (2018).
Rainfall in January is a relatively wet time of year, averaging 41 mm, with a wettest year of 88 mm.
A quieter season to visit Nampa
If your dates are flexible, the more temperate months of June and August tend to be the most comfortable for visiting Nampa. That said, January — with days averaging 4°C and nights around -4.3°C (mean -0.1°C) and moderate rainfall (41 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 | 4.4°C | 0.2°C | -4.0°C | 9.4°C | -10.1°C | 35 mm | 74% | 1.8 m/s | 2.1 |
| 2024 | 3.5°C | -0.4°C | -4.3°C | 17.1°C | -19.6°C | 88 mm | 84% | 2.4 m/s | 1.6 |
| 2023 | 4.5°C | 0.4°C | -3.7°C | 10.6°C | -13.6°C | 29 mm | 77% | 2.5 m/s | 1.7 |
| 2022 | 2.4°C | -1.4°C | -5.1°C | 8.5°C | -14.9°C | 35 mm | 83% | 1.8 m/s | 1.8 |
| 2021 | 5.8°C | 1.8°C | -2.2°C | 11.1°C | -5.0°C | 43 mm | 73% | 2.3 m/s | 1.8 |
| 2020 | 7.3°C | 2.9°C | -1.5°C | 13.8°C | -6.6°C | 56 mm | 72% | 2.7 m/s | 1.5 |
| 2019 | 6.1°C | 1.6°C | -2.9°C | 10.9°C | -10.1°C | 36 mm | 74% | 2.2 m/s | 1.9 |
| 2018 | 7.7°C | 3.3°C | -1.1°C | 17.7°C | -4.5°C | 39 mm | 73% | 2.2 m/s | 1.7 |
| 2017 ❄️ 🌧️ | -1.9°C | -6.0°C | -10.2°C | 2.6°C | -25.1°C | 88 mm | 91% | 1.9 m/s | 1.5 |
| 2016 | 4.5°C | 0.4°C | -3.7°C | 10.9°C | -14.4°C | 32 mm | 81% | 2.3 m/s | 1.7 |
| 2015 | 4.7°C | 1.0°C | -2.7°C | 10.6°C | -11.7°C | 21 mm | 84% | 1.4 m/s | 1.7 |
| 2014 | 4.3°C | 0.4°C | -3.4°C | 10.1°C | -8.8°C | 25 mm | 72% | 1.8 m/s | 1.8 |
| 2013 | 0.0°C | -4.2°C | -8.3°C | 9.2°C | -15.0°C | 25 mm | 84% | 1.9 m/s | 1.9 |
| 2012 | 5.6°C | 1.3°C | -3.1°C | 12.3°C | -8.5°C | 63 mm | 67% | 2.5 m/s | 1.8 |
| 2011 | 3.5°C | -0.6°C | -4.6°C | 10.8°C | -14.3°C | 34 mm | 81% | 1.8 m/s | 1.8 |
| 2010 | 5.8°C | 1.7°C | -2.5°C | 10.8°C | -8.4°C | 65 mm | 79% | 2.5 m/s | 1.6 |
| 2009 | 3.5°C | -0.7°C | -4.9°C | 10.3°C | -12.3°C | 26 mm | 78% | 2.2 m/s | 1.6 |
| 2008 | 2.6°C | -1.6°C | -5.7°C | 9.2°C | -12.5°C | 33 mm | 74% | 3 m/s | 1.7 |
| 2007 | 3.0°C | -1.4°C | -5.8°C | 10.4°C | -13.3°C | 9 mm | 71% | 2 m/s | 2.2 |
| 2006 | 5.8°C | 1.9°C | -2.0°C | 12.0°C | -6.3°C | 61 mm | 78% | 2.8 m/s | 1.5 |
| 2005 | 5.6°C | 1.1°C | -3.5°C | 12.3°C | -10.5°C | 11 mm | 79% | 1.9 m/s | 1.7 |
| 2004 | 2.2°C | -1.5°C | -5.2°C | 6.6°C | -16.6°C | 53 mm | 83% | 2.2 m/s | 1.4 |
| 2003 🔥 | 8.2°C | 3.8°C | -0.7°C | 15.5°C | -4.2°C | 47 mm | 80% | 1.7 m/s | 1.5 |
| 2002 | 3.7°C | 0.0°C | -3.7°C | 8.1°C | -10.9°C | 30 mm | 74% | 2.5 m/s | 1.6 |
| 2001 | 2.8°C | -1.5°C | -5.9°C | 7.9°C | -9.9°C | 31 mm | 77% | 1.5 m/s | 1.6 |
| 2000 | 4.6°C | 0.9°C | -2.8°C | 9.7°C | -9.1°C | 59 mm | 77% | 2.3 m/s | 1.5 |
| 1999 | 5.2°C | 1.2°C | -2.9°C | 11.0°C | -9.5°C | 43 mm | 74% | 2.5 m/s | 1.6 |
| 1998 | 6.2°C | 2.2°C | -1.7°C | 13.0°C | -7.4°C | 80 mm | 78% | 2.7 m/s | 1.5 |
| 1997 | 4.0°C | 0.1°C | -3.9°C | 11.2°C | -15.1°C | 83 mm | 81% | 2.4 m/s | 1.7 |
| 1996 | 4.3°C | 0.4°C | -3.4°C | 11.6°C | -15.5°C | 51 mm | 79% | 2.7 m/s | 1.5 |
| 1995 | 5.7°C | 1.5°C | -2.8°C | 14.4°C | -13.2°C | 60 mm | 80% | 2.6 m/s | 1.7 |
| 1994 | 5.8°C | 1.8°C | -2.3°C | 10.4°C | -7.7°C | 37 mm | 76% | 2 m/s | 1.7 |
| 1993 | 0.2°C | -4.4°C | -9.0°C | 5.1°C | -14.5°C | 47 mm | 86% | 2.3 m/s | 1.8 |
| 1992 | 5.0°C | 0.8°C | -3.4°C | 12.6°C | -8.2°C | 13 mm | 74% | 2.1 m/s | 1.7 |
| 1991 | 3.4°C | -1.2°C | -5.9°C | 10.5°C | -11.6°C | 30 mm | 74% | 1.9 m/s | 1.8 |
| 1990 | 5.4°C | 1.7°C | -2.1°C | 12.7°C | -7.6°C | 33 mm | 71% | 2.6 m/s | 1.4 |
| 1989 | 1.3°C | -3.0°C | -7.3°C | 8.1°C | -12.7°C | 38 mm | 85% | 2.6 m/s | 1.7 |
| 1988 | 2.5°C | -1.5°C | -5.4°C | 8.8°C | -13.1°C | 41 mm | 77% | 2.1 m/s | 1.7 |
| 1987 | 3.0°C | -1.9°C | -6.7°C | 14.1°C | -16.5°C | 28 mm | 79% | 2.1 m/s | 1.7 |
| 1986 | 6.3°C | 2.0°C | -2.2°C | 12.4°C | -7.7°C | 30 mm | 80% | 2.4 m/s | 1.6 |
| 1985 | 0.4°C | -3.8°C | -8.0°C | 4.4°C | -14.9°C | 5 mm | 85% | 1.2 m/s | 1.9 |
| 1984 | 0.3°C | -3.8°C | -8.0°C | 7.9°C | -18.5°C | 18 mm | 89% | 1.6 m/s | 1.7 |
| 1983 | 5.3°C | 1.5°C | -2.2°C | 9.2°C | -12.3°C | 48 mm | 82% | 2.4 m/s | — |
| 1982 | -0.2°C | -4.3°C | -8.5°C | 7.1°C | -23.6°C | 41 mm | 87% | 2.8 m/s | — |
| 1981 | 6.3°C | 1.6°C | -3.0°C | 13.8°C | -7.1°C | 28 mm | 77% | 1.9 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 4°C with lows near -4.3°C (mean -0.1°C), based on 45 years of NASA POWER data.
January averages 41 mm of rainfall in Nampa, a relatively wet time of year. The wettest on record was 88 mm in 2017.
The hottest January reached 17.7°C in 2018. The coldest dipped to -25.1°C in 2017.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1.9°C. Daytime highs moved from 2.4°C to 4.1°C and overnight lows from -5.9°C to -3.9°C over the same span.
January is one of the cooler months of the year in Nampa and a relatively wet time of year, so plan for around 4°C daytime highs and -4.3°C at night.
Yes — January is the coldest month of the year in Nampa, averaging -0.1°C.
For January in Nampa, pack warm layers and a jacket for chilly mornings, with typical highs of 4°C and lows of -4.3°C.
Relative humidity in January averages 79% — quite humid.
Average wind speed in January is 2.2 m/s. The windiest January on record averaged 3 m/s (2008).
The wettest January on record was 2017 with 88 mm. On average, January sees 41 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 Nampa 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.
