January is one of the cooler months of the year in Sudbury, with average highs near -8.4°C and lows around -19.2°C (mean -13.8°C). It is one of the drier months, averaging 47 mm of rainfall and 97% relative humidity across the period.
January is one of the cooler months of the year in Sudbury. Across 45 years of records, the warmest January in Sudbury was 2006 — when the month averaged -9°C — while the coldest was 1994 at -22.9°C. Typical January days reach -8.4°C with nights near -19.2°C. The long-term trend is warming, about 0.9°C per decade.
January is one of the drier months in Sudbury, averaging 47 mm of rainfall. The wettest January on record was 2008 with 89 mm, while the driest was 2021 at 12 mm.
Relative humidity in Sudbury during January averages 97%. The most humid Januarys were 1984, 1997 and 2006 at 99%, and the least humid was 1995 at 91%.
January receives about 1.3 kWh/m²/day of solar energy in Sudbury. The sunniest January was 2004 at 1.6 kWh/m²/day, and the cloudiest was 2012 at 1.
Average wind speed in Sudbury during January is 1.1 m/s. The windiest Januarys were 2014, 2018 and 2025, among others at 1.2 m/s, while the calmest were 1981 and 2021 at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -15.4°C | -14.4°C | -13.5°C | -13.4°C | -11.5°C | +3.9°C |
| Avg High | -9.5°C | -8.7°C | -8.4°C | -8.1°C | -6.6°C | +2.9°C |
| Avg Low | -21.3°C | -20.0°C | -18.5°C | -18.7°C | -16.4°C | +4.9°C |
| Avg Rain | 48 mm | 48 mm | 50 mm | 52 mm | 35 mm | -13 mm |
January temperatures in Sudbury have risen by about 5.4°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -45.7°C (1981) to a record high of 5.7°C (1996).
Rainfall in January is one of the drier months, averaging 47 mm, with a wettest year of 89 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 1.1°C per decade, narrowing the gap between day and night.
A quieter season to visit Sudbury
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Sudbury. That said, January — with days averaging -8.4°C and nights around -19.2°C (mean -13.8°C) and moderate rainfall (47 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 | -8.5°C | -14.3°C | -20.1°C | -0.2°C | -32.5°C | 38 mm | 95% | 1.2 m/s | 1.4 |
| 2024 | -5.8°C | -9.4°C | -13.1°C | 0.5°C | -28.9°C | 40 mm | 95% | 1 m/s | 1.1 |
| 2023 | -4.4°C | -9.3°C | -14.2°C | 2.0°C | -27.5°C | 43 mm | 94% | 1.1 m/s | 1.2 |
| 2022 | -10.1°C | -16.0°C | -21.9°C | -2.1°C | -33.0°C | 24 mm | 93% | 1.1 m/s | 1.5 |
| 2021 | -5.3°C | -9.7°C | -14.2°C | 0.6°C | -26.3°C | 12 mm | 95% | 0.9 m/s | 1.3 |
| 2020 | -5.6°C | -10.2°C | -14.8°C | 0.9°C | -26.1°C | 51 mm | 98% | 1 m/s | 1.1 |
| 2019 | -10.5°C | -17.2°C | -23.8°C | 0.1°C | -43.5°C | 56 mm | 98% | 1.1 m/s | 1.5 |
| 2018 | -8.2°C | -13.1°C | -18.1°C | 3.9°C | -36.8°C | 62 mm | 96% | 1.2 m/s | 1.2 |
| 2017 | -5.0°C | -9.3°C | -13.6°C | 0.8°C | -26.7°C | 46 mm | 97% | 1 m/s | 1.1 |
| 2016 | -7.1°C | -12.0°C | -16.9°C | 1.1°C | -30.9°C | 73 mm | 98% | 1.1 m/s | 1.1 |
| 2015 | -10.4°C | -16.9°C | -23.3°C | -0.1°C | -32.8°C | 35 mm | 98% | 1.1 m/s | 1.3 |
| 2014 | -11.1°C | -16.6°C | -22.2°C | 0.1°C | -38.5°C | 53 mm | 99% | 1.2 m/s | 1.3 |
| 2013 | -5.9°C | -11.0°C | -16.2°C | 2.9°C | -32.2°C | 64 mm | 93% | 1.2 m/s | 1.3 |
| 2012 | -5.1°C | -10.8°C | -16.5°C | 0.8°C | -33.6°C | 67 mm | 97% | 1.1 m/s | 1 |
| 2011 | -9.9°C | -14.6°C | -19.4°C | 3.9°C | -39.4°C | 34 mm | 92% | 1.1 m/s | 1.4 |
| 2010 | -8.3°C | -12.8°C | -17.2°C | 0.4°C | -34.9°C | 25 mm | 99% | 1.1 m/s | 1.3 |
| 2009 | -10.9°C | -16.5°C | -22.0°C | -2.9°C | -39.7°C | 41 mm | 98% | 1 m/s | 1.5 |
| 2008 🌧️ | -5.4°C | -9.7°C | -13.9°C | 3.8°C | -30.5°C | 89 mm | 97% | 1.2 m/s | 1.2 |
| 2007 | -6.0°C | -10.1°C | -14.1°C | 4.8°C | -28.9°C | 43 mm | 93% | 1.1 m/s | 1.4 |
| 2006 🔥 | -4.6°C | -9.0°C | -13.3°C | 0.3°C | -26.2°C | 77 mm | 99% | 1.1 m/s | 1.2 |
| 2005 | -9.9°C | -15.7°C | -21.6°C | 1.3°C | -38.2°C | 53 mm | 96% | 1 m/s | 1.5 |
| 2004 | -14.8°C | -20.0°C | -25.2°C | 1.2°C | -40.8°C | 38 mm | 96% | 1.1 m/s | 1.6 |
| 2003 | -11.2°C | -16.7°C | -22.2°C | -1.6°C | -37.1°C | 26 mm | 97% | 1.1 m/s | 1.4 |
| 2002 | -5.0°C | -9.8°C | -14.6°C | 0.8°C | -25.9°C | 29 mm | 96% | 1 m/s | 1.3 |
| 2001 | -6.6°C | -11.7°C | -16.9°C | 0.1°C | -27.4°C | 47 mm | 99% | 1.1 m/s | 1.2 |
| 2000 | -9.9°C | -15.7°C | -21.6°C | 0.2°C | -38.6°C | 55 mm | 99% | 1.1 m/s | 1.3 |
| 1999 | -9.5°C | -15.2°C | -21.0°C | 1.1°C | -38.2°C | 71 mm | 98% | 1.1 m/s | 1.4 |
| 1998 | -7.4°C | -12.2°C | -17.0°C | 3.4°C | -33.9°C | 39 mm | 96% | 1 m/s | 1.2 |
| 1997 | -10.7°C | -16.9°C | -23.1°C | 0.3°C | -39.3°C | 68 mm | 99% | 1.2 m/s | 1.3 |
| 1996 | -9.7°C | -15.4°C | -21.2°C | 5.7°C | -33.6°C | 57 mm | 95% | 1.2 m/s | 1.3 |
| 1995 | -5.7°C | -9.5°C | -13.2°C | 2.6°C | -26.8°C | 48 mm | 91% | 1.2 m/s | 1.2 |
| 1994 ❄️ | -15.7°C | -22.9°C | -30.1°C | -1.6°C | -43.9°C | 36 mm | 98% | 1.1 m/s | 1.4 |
| 1993 | -7.2°C | -13.4°C | -19.7°C | 0.4°C | -32.3°C | 36 mm | 97% | 1.2 m/s | 1.3 |
| 1992 | -8.6°C | -14.3°C | -20.0°C | 0.5°C | -39.3°C | 43 mm | 98% | 1 m/s | 1.4 |
| 1991 | -8.2°C | -14.3°C | -20.4°C | 0.5°C | -33.7°C | 28 mm | 95% | 1.2 m/s | 1.2 |
| 1990 | -4.3°C | -9.5°C | -14.7°C | 0.8°C | -27.0°C | 52 mm | 98% | 1.2 m/s | 1.2 |
| 1989 | -6.1°C | -12.1°C | -18.0°C | 0.3°C | -39.0°C | 63 mm | 98% | 1.1 m/s | 1.3 |
| 1988 | -7.7°C | -13.7°C | -19.7°C | 1.6°C | -39.7°C | 53 mm | 98% | 1.2 m/s | 1.2 |
| 1987 | -6.5°C | -11.6°C | -16.8°C | 0.6°C | -31.7°C | 25 mm | 97% | 1 m/s | 1.2 |
| 1986 | -9.7°C | -15.8°C | -21.8°C | 0.2°C | -34.4°C | 28 mm | 99% | 1.2 m/s | 1.2 |
| 1985 | -12.2°C | -17.2°C | -22.1°C | -3.0°C | -31.5°C | 54 mm | 98% | 1.1 m/s | 1.3 |
| 1984 | -11.7°C | -18.2°C | -24.6°C | -0.2°C | -39.7°C | 41 mm | 99% | 1.1 m/s | 1.4 |
| 1983 | -7.4°C | -12.7°C | -18.0°C | 0.7°C | -34.6°C | 58 mm | 97% | 1.1 m/s | — |
| 1982 | -12.8°C | -20.3°C | -27.9°C | -0.3°C | -44.5°C | 89 mm | 99% | 1.2 m/s | — |
| 1981 | -11.5°C | -17.3°C | -23.2°C | 0.3°C | -45.7°C | 19 mm | 99% | 0.9 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around -8.4°C with lows near -19.2°C (mean -13.8°C), based on 45 years of NASA POWER data.
January averages 47 mm of rainfall in Sudbury, one of the drier months. The wettest on record was 89 mm in 2008.
The hottest January reached 5.7°C in 1996. The coldest dipped to -45.7°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 5.4°C. Daytime highs moved from -11.1°C to -6.8°C and overnight lows from -23.2°C to -16.7°C over the same span.
January is one of the cooler months of the year in Sudbury and one of the drier months, so plan for around -8.4°C daytime highs and -19.2°C at night.
Yes — January is the coldest month of the year in Sudbury, averaging -13.8°C.
For January in Sudbury, pack warm layers and a jacket for chilly mornings, with typical highs of -8.4°C and lows of -19.2°C.
Relative humidity in January averages 97% — quite humid.
Average wind speed in January is 1.1 m/s. The windiest January on record averaged 1.2 m/s (1982).
The wettest January on record was 2008 with 89 mm. On average, January sees 47 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 Sudbury 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.
