January is one of the cooler months of the year in Snohomish, with average highs near 3.9°C and lows around -1°C (mean 1.5°C). It is a relatively wet time of year, averaging 259 mm of rainfall and 93% relative humidity across the period.
January is one of the cooler months of the year in Snohomish. Across 45 years of records, the warmest Januarys in Snohomish were 1981 and 2015 — when the month averaged 4.3°C — while the coldest was 1993 at -2.7°C. Typical January days reach 3.9°C with nights near -1°C. The long-term January temperature trend is broadly flat.
January is a relatively wet time of year in Snohomish, averaging 259 mm of rainfall. The wettest January on record was 2020 with 472 mm, while the driest was 1985 at 29 mm.
Relative humidity in Snohomish during January averages 93%. The most humid January was 2006 at 98%, and the least humid was 1981 at 88%.
January receives about 1.1 kWh/m²/day of solar energy in Snohomish. The sunniest January was 2025 at 1.4 kWh/m²/day, and the cloudiest was 1999 at 0.7.
Average wind speed in Snohomish during January is 0.3 m/s. The windiest January was 2017 at 0.5 m/s, while the calmest were 2021, 2023 and 2024, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 1.3°C | 1.1°C | 1.3°C | 1.9°C | 1.6°C | +0.3°C |
| Avg High | 3.8°C | 3.5°C | 3.7°C | 4.3°C | 3.9°C | +0.1°C |
| Avg Low | -1.3°C | -1.4°C | -1.1°C | -0.6°C | -0.7°C | +0.6°C |
| Avg Rain | 248 mm | 275 mm | 267 mm | 235 mm | 274 mm | +26 mm |
January temperatures in Snohomish have stayed relatively stable across the record.
January has ranged from a record low of -19.8°C (1996) to a record high of 14.3°C (2015).
Rainfall in January is a relatively wet time of year, averaging 259 mm, with a wettest year of 472 mm.
A quieter season to visit Snohomish
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Snohomish. That said, January — with days averaging 3.9°C and nights around -1°C (mean 1.5°C) and higher rainfall (259 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 | 3.0°C | 0.0°C | -3.1°C | 5.4°C | -7.8°C | 93 mm | 92% | 0.4 m/s | 1.4 |
| 2024 | 3.1°C | 0.8°C | -1.4°C | 12.7°C | -17.9°C | 311 mm | 95% | 0.3 m/s | 1 |
| 2023 | 4.4°C | 2.2°C | -0.1°C | 9.6°C | -8.2°C | 154 mm | 92% | 0.3 m/s | 1.1 |
| 2022 | 4.2°C | 1.8°C | -0.6°C | 7.9°C | -15.3°C | 323 mm | 92% | 0.4 m/s | 1.1 |
| 2021 | 5.0°C | 2.7°C | 0.4°C | 9.1°C | -3.8°C | 290 mm | 92% | 0.3 m/s | 1.1 |
| 2020 🌧️ | 3.9°C | 2.2°C | 0.6°C | 8.6°C | -6.4°C | 472 mm | 97% | 0.3 m/s | 0.8 |
| 2019 | 6.0°C | 3.3°C | 0.5°C | 8.9°C | -3.7°C | 166 mm | 88% | 0.3 m/s | 1.2 |
| 2018 | 4.6°C | 3.1°C | 1.6°C | 8.7°C | -5.0°C | 329 mm | 96% | 0.3 m/s | 0.9 |
| 2017 | 1.3°C | -2.0°C | -5.3°C | 5.7°C | -13.1°C | 117 mm | 90% | 0.5 m/s | 1.3 |
| 2016 | 4.1°C | 1.7°C | -0.6°C | 8.9°C | -8.3°C | 252 mm | 96% | 0.3 m/s | 1.1 |
| 2015 | 7.4°C | 4.3°C | 1.3°C | 14.3°C | -4.7°C | 221 mm | 91% | 0.3 m/s | 1.2 |
| 2014 | 5.5°C | 2.7°C | -0.1°C | 10.6°C | -4.9°C | 230 mm | 90% | 0.4 m/s | 1.1 |
| 2013 | 2.1°C | -0.1°C | -2.3°C | 4.6°C | -11.1°C | 215 mm | 91% | 0.4 m/s | 1.1 |
| 2012 | 2.7°C | 0.5°C | -1.6°C | 7.5°C | -8.5°C | 283 mm | 94% | 0.3 m/s | 0.9 |
| 2011 | 3.6°C | 1.4°C | -0.9°C | 10.2°C | -10.2°C | 325 mm | 94% | 0.3 m/s | 1 |
| 2010 | 5.9°C | 3.7°C | 1.4°C | 9.1°C | -3.6°C | 216 mm | 92% | 0.3 m/s | 0.9 |
| 2009 | 2.4°C | -0.2°C | -2.7°C | 5.4°C | -10.5°C | 304 mm | 94% | 0.4 m/s | 1.2 |
| 2008 | 1.4°C | -1.0°C | -3.3°C | 4.5°C | -11.7°C | 211 mm | 94% | 0.4 m/s | 1.1 |
| 2007 | 2.7°C | -0.2°C | -3.0°C | 8.0°C | -13.1°C | 256 mm | 94% | 0.4 m/s | 1.2 |
| 2006 | 4.4°C | 3.0°C | 1.6°C | 8.4°C | -1.4°C | 459 mm | 98% | 0.3 m/s | 0.8 |
| 2005 | 5.5°C | 2.5°C | -0.5°C | 13.8°C | -10.8°C | 187 mm | 92% | 0.3 m/s | 1.1 |
| 2004 | 3.2°C | 1.0°C | -1.2°C | 9.1°C | -16.9°C | 318 mm | 96% | 0.3 m/s | 0.9 |
| 2003 | 7.0°C | 4.2°C | 1.4°C | 11.7°C | -3.0°C | 287 mm | 92% | 0.3 m/s | 1.1 |
| 2002 | 3.2°C | 1.3°C | -0.5°C | 9.1°C | -5.6°C | 311 mm | 96% | 0.3 m/s | 0.9 |
| 2001 | 4.7°C | 2.0°C | -0.6°C | 7.9°C | -5.9°C | 128 mm | 91% | 0.3 m/s | 1.1 |
| 2000 | 2.8°C | 0.2°C | -2.3°C | 4.9°C | -6.7°C | 205 mm | 95% | 0.3 m/s | 1.1 |
| 1999 | 4.0°C | 2.2°C | 0.4°C | 6.8°C | -5.1°C | 270 mm | 96% | 0.3 m/s | 0.7 |
| 1998 | 3.0°C | 0.9°C | -1.2°C | 8.2°C | -15.2°C | 330 mm | 95% | 0.3 m/s | 1.1 |
| 1997 | 2.7°C | 0.3°C | -2.0°C | 6.7°C | -11.3°C | 341 mm | 94% | 0.3 m/s | 1.2 |
| 1996 | 2.2°C | -0.3°C | -2.7°C | 8.9°C | -19.8°C | 311 mm | 95% | 0.3 m/s | 1.1 |
| 1995 | 5.1°C | 2.3°C | -0.5°C | 11.0°C | -6.6°C | 224 mm | 90% | 0.3 m/s | 1.2 |
| 1994 | 6.3°C | 4.0°C | 1.6°C | 9.8°C | -3.0°C | 155 mm | 94% | 0.3 m/s | 1.2 |
| 1993 ❄️ | 0.7°C | -2.7°C | -6.0°C | 5.8°C | -14.3°C | 176 mm | 95% | 0.4 m/s | 1.3 |
| 1992 | 5.0°C | 2.6°C | 0.2°C | 9.3°C | -8.7°C | 322 mm | 93% | 0.4 m/s | 1 |
| 1991 | 2.5°C | -0.2°C | -2.9°C | 6.0°C | -12.5°C | 223 mm | 91% | 0.4 m/s | 1.2 |
| 1990 | 3.9°C | 1.5°C | -0.8°C | 7.8°C | -5.8°C | 397 mm | 96% | 0.3 m/s | 1.1 |
| 1989 | 2.5°C | 0.5°C | -1.5°C | 5.9°C | -10.4°C | 295 mm | 97% | 0.3 m/s | 1.1 |
| 1988 | 2.6°C | 0.0°C | -2.6°C | 8.3°C | -9.6°C | 193 mm | 93% | 0.4 m/s | 1.1 |
| 1987 | 3.1°C | 0.5°C | -2.1°C | 9.7°C | -9.8°C | 248 mm | 93% | 0.4 m/s | 1.1 |
| 1986 | 5.5°C | 3.2°C | 0.9°C | 9.6°C | -3.7°C | 316 mm | 94% | 0.3 m/s | 0.9 |
| 1985 | 2.7°C | -0.6°C | -3.9°C | 8.1°C | -8.1°C | 29 mm | 91% | 0.4 m/s | 1.2 |
| 1984 | 4.3°C | 1.7°C | -0.9°C | 10.0°C | -10.3°C | 329 mm | 92% | 0.3 m/s | 1.1 |
| 1983 | 5.0°C | 2.8°C | 0.6°C | 9.2°C | -5.6°C | 353 mm | 94% | 0.3 m/s | — |
| 1982 | 0.8°C | -1.0°C | -2.8°C | 4.5°C | -18.7°C | 385 mm | 98% | 0.3 m/s | — |
| 1981 🔥 | 7.6°C | 4.3°C | 1.0°C | 11.5°C | -2.2°C | 83 mm | 88% | 0.3 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 3.9°C with lows near -1°C (mean 1.5°C), based on 45 years of NASA POWER data.
January averages 259 mm of rainfall in Snohomish, a relatively wet time of year. The wettest on record was 472 mm in 2020.
The hottest January reached 14.3°C in 2015. The coldest dipped to -19.8°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.1°C — but days and nights have moved in opposite directions. Overnight lows rose from -1.2°C to -1°C while daytime highs eased from 4.1°C to 3.9°C, narrowing the gap between day and night.
January is one of the cooler months of the year in Snohomish and a relatively wet time of year, so plan for around 3.9°C daytime highs and -1°C at night.
Not quite — January is the 2nd coolest month in Snohomish, averaging 1.5°C.
For January in Snohomish, pack warm layers and a jacket for chilly mornings, with typical highs of 3.9°C and lows of -1°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 93% — quite humid.
Average wind speed in January is 0.3 m/s. The windiest January on record averaged 0.5 m/s (2017).
The wettest January on record was 2020 with 472 mm. On average, January sees 259 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 Snohomish 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.
