January is one of the cooler months of the year in Watertown, with average highs near -3.8°C and lows around -11.9°C (mean -7.8°C). It is one of the drier months, averaging 79 mm of rainfall and 93% relative humidity across the period.
January is one of the cooler months of the year in Watertown. Across 45 years of records, the warmest January in Watertown was 2006 — when the month averaged -2.7°C — while the coldest was 1994 at -15.2°C. Typical January days reach -3.8°C with nights near -11.9°C. The long-term trend is warming, about 0.7°C per decade.
January is one of the drier months in Watertown, averaging 79 mm of rainfall. The wettest January on record was 1998 with 147 mm, while the driest was 1981 at 29 mm.
Relative humidity in Watertown during January averages 93%. The most humid January was 1994 at 99%, and the least humid was 2000 at 87%.
January receives about 1.4 kWh/m²/day of solar energy in Watertown. The sunniest January was 2003 at 1.8 kWh/m²/day, and the cloudiest were 2023 and 2024 at 1.1.
Average wind speed in Watertown during January is 1.5 m/s. The windiest January was 1997 at 2 m/s, while the calmest were 2011, 2021 and 2023, among others at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -9.6°C | -7.6°C | -7.8°C | -7.4°C | -6.5°C | +3.1°C |
| Avg High | -5.4°C | -3.4°C | -3.8°C | -3.5°C | -2.8°C | +2.6°C |
| Avg Low | -13.8°C | -11.8°C | -11.7°C | -11.4°C | -10.3°C | +3.5°C |
| Avg Rain | 66 mm | 105 mm | 74 mm | 72 mm | 73 mm | +7 mm |
January temperatures in Watertown have risen by about 4.3°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -37°C (1981) to a record high of 14.8°C (2008).
Rainfall in January is one of the drier months, averaging 79 mm, with a wettest year of 147 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.8°C per decade, narrowing the gap between day and night.
A quieter season to visit Watertown
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Watertown. That said, January — with days averaging -3.8°C and nights around -11.9°C (mean -7.8°C) and moderate rainfall (79 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 | -4.6°C | -7.6°C | -10.6°C | 4.1°C | -20.9°C | 60 mm | 91% | 1.6 m/s | 1.5 |
| 2024 | -1.7°C | -4.5°C | -7.4°C | 3.3°C | -16.8°C | 103 mm | 92% | 1.4 m/s | 1.1 |
| 2023 | -0.3°C | -3.8°C | -7.3°C | 5.4°C | -16.8°C | 84 mm | 93% | 1.2 m/s | 1.1 |
| 2022 | -6.0°C | -11.4°C | -16.9°C | 4.3°C | -27.7°C | 46 mm | 92% | 1.5 m/s | 1.6 |
| 2021 | -3.6°C | -7.3°C | -11.0°C | 2.3°C | -24.9°C | 53 mm | 95% | 1.2 m/s | 1.4 |
| 2020 | -0.6°C | -4.5°C | -8.5°C | 11.8°C | -20.0°C | 90 mm | 92% | 1.4 m/s | 1.2 |
| 2019 | -4.9°C | -9.1°C | -13.3°C | 6.5°C | -25.2°C | 92 mm | 92% | 1.7 m/s | 1.3 |
| 2018 | -3.6°C | -8.0°C | -12.4°C | 13.4°C | -26.1°C | 88 mm | 94% | 1.6 m/s | 1.4 |
| 2017 | -0.7°C | -3.7°C | -6.6°C | 7.5°C | -18.1°C | 83 mm | 89% | 1.5 m/s | 1.4 |
| 2016 | -2.2°C | -5.8°C | -9.5°C | 7.5°C | -18.6°C | 51 mm | 90% | 1.7 m/s | 1.4 |
| 2015 | -5.5°C | -10.3°C | -15.1°C | 6.8°C | -24.7°C | 56 mm | 90% | 1.6 m/s | 1.4 |
| 2014 | -5.7°C | -9.3°C | -12.9°C | 6.4°C | -25.6°C | 74 mm | 91% | 1.8 m/s | 1.3 |
| 2013 | -1.5°C | -6.0°C | -10.6°C | 13.0°C | -24.5°C | 69 mm | 88% | 1.6 m/s | 1.5 |
| 2012 | -1.2°C | -5.3°C | -9.5°C | 4.7°C | -28.3°C | 105 mm | 91% | 1.6 m/s | 1.3 |
| 2011 | -5.5°C | -8.9°C | -12.3°C | 8.8°C | -27.9°C | 37 mm | 94% | 1.2 m/s | 1.3 |
| 2010 | -3.9°C | -7.6°C | -11.4°C | 9.5°C | -24.1°C | 67 mm | 94% | 1.4 m/s | 1.4 |
| 2009 | -6.4°C | -10.1°C | -13.9°C | 0.3°C | -22.9°C | 63 mm | 96% | 1.4 m/s | 1.6 |
| 2008 | -0.9°C | -4.3°C | -7.7°C | 14.8°C | -22.2°C | 82 mm | 91% | 1.6 m/s | 1.3 |
| 2007 | -2.6°C | -6.5°C | -10.3°C | 11.9°C | -22.1°C | 106 mm | 93% | 1.4 m/s | 1.3 |
| 2006 🔥 | 0.9°C | -2.7°C | -6.4°C | 7.5°C | -19.5°C | 107 mm | 93% | 1.5 m/s | 1.3 |
| 2005 | -4.7°C | -9.1°C | -13.4°C | 10.4°C | -26.8°C | 69 mm | 91% | 1.5 m/s | 1.6 |
| 2004 | -9.2°C | -13.0°C | -16.9°C | 9.1°C | -28.8°C | 59 mm | 95% | 1.5 m/s | 1.4 |
| 2003 | -7.6°C | -12.1°C | -16.6°C | 0.0°C | -29.6°C | 60 mm | 97% | 1.4 m/s | 1.8 |
| 2002 | -0.2°C | -3.8°C | -7.3°C | 6.4°C | -16.4°C | 74 mm | 94% | 1.6 m/s | 1.4 |
| 2001 | -3.3°C | -7.6°C | -12.0°C | 0.3°C | -20.4°C | 51 mm | 99% | 1.2 m/s | 1.4 |
| 2000 | -4.3°C | -8.4°C | -12.5°C | 12.4°C | -24.6°C | 73 mm | 87% | 1.7 m/s | 1.5 |
| 1999 | -3.8°C | -8.0°C | -12.3°C | 9.0°C | -30.0°C | 145 mm | 95% | 1.6 m/s | 1.4 |
| 1998 🌧️ | -1.1°C | -5.0°C | -8.8°C | 6.7°C | -23.7°C | 147 mm | 95% | 1.3 m/s | 1.5 |
| 1997 | -3.7°C | -8.0°C | -12.4°C | 8.5°C | -26.8°C | 107 mm | 94% | 2 m/s | 1.4 |
| 1996 | -5.7°C | -10.0°C | -14.3°C | 9.9°C | -27.4°C | 101 mm | 95% | 1.8 m/s | 1.3 |
| 1995 | -0.6°C | -4.1°C | -7.6°C | 13.6°C | -22.4°C | 87 mm | 94% | 1.5 m/s | 1.4 |
| 1994 ❄️ | -9.9°C | -15.2°C | -20.5°C | 0.7°C | -33.5°C | 102 mm | 99% | 1.6 m/s | 1.4 |
| 1993 | -1.9°C | -6.1°C | -10.3°C | 7.9°C | -19.7°C | 107 mm | 93% | 1.5 m/s | 1.4 |
| 1992 | -3.6°C | -8.0°C | -12.4°C | 7.0°C | -25.2°C | 90 mm | 93% | 1.5 m/s | 1.4 |
| 1991 | -4.0°C | -8.5°C | -12.9°C | 1.3°C | -25.1°C | 72 mm | 95% | 1.6 m/s | 1.5 |
| 1990 | 0.6°C | -3.2°C | -7.0°C | 7.2°C | -21.8°C | 92 mm | 92% | 1.7 m/s | 1.2 |
| 1989 | -1.9°C | -6.1°C | -10.4°C | 4.4°C | -27.2°C | 61 mm | 91% | 1.9 m/s | 1.3 |
| 1988 | -3.9°C | -8.0°C | -12.1°C | 9.0°C | -29.2°C | 46 mm | 91% | 1.7 m/s | 1.3 |
| 1987 | -4.2°C | -8.1°C | -12.0°C | 1.2°C | -24.6°C | 78 mm | 96% | 1.4 m/s | 1.4 |
| 1986 | -4.3°C | -8.6°C | -13.0°C | 3.9°C | -28.7°C | 75 mm | 96% | 1.6 m/s | 1.3 |
| 1985 | -6.3°C | -10.0°C | -13.8°C | 6.1°C | -26.5°C | 89 mm | 95% | 1.5 m/s | 1.5 |
| 1984 | -6.9°C | -10.8°C | -14.6°C | 0.4°C | -29.1°C | 51 mm | 99% | 1.3 m/s | 1.4 |
| 1983 | -3.1°C | -7.0°C | -10.9°C | 3.0°C | -22.3°C | 54 mm | 90% | 1.5 m/s | — |
| 1982 | -9.0°C | -14.0°C | -19.0°C | 0.9°C | -30.7°C | 113 mm | 98% | 1.7 m/s | — |
| 1981 | -9.3°C | -14.1°C | -18.8°C | 1.1°C | -37.0°C | 29 mm | 98% | 1.2 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around -3.8°C with lows near -11.9°C (mean -7.8°C), based on 45 years of NASA POWER data.
January averages 79 mm of rainfall in Watertown, one of the drier months. The wettest on record was 147 mm in 1998.
The hottest January reached 14.8°C in 2008. The coldest dipped to -37°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 4.3°C. Daytime highs moved from -6.9°C to -3.2°C and overnight lows from -15.4°C to -10.6°C over the same span.
January is one of the cooler months of the year in Watertown and one of the drier months, so plan for around -3.8°C daytime highs and -11.9°C at night.
Yes — January is the coldest month of the year in Watertown, averaging -7.8°C.
For January in Watertown, pack warm layers and a jacket for chilly mornings, with typical highs of -3.8°C and lows of -11.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 93% — quite humid.
Average wind speed in January is 1.5 m/s. The windiest January on record averaged 2 m/s (1997).
The wettest January on record was 1998 with 147 mm. On average, January sees 79 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 Watertown 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.
