January is one of the cooler months of the year in Waterbury, with average highs near 0.5°C and lows around -8°C (mean -3.7°C). It is one of the drier months, averaging 87 mm of rainfall and 88% relative humidity across the period.
January is one of the cooler months of the year in Waterbury. Across 45 years of records, the warmest January in Waterbury was 2023 — when the month averaged 1.5°C — while the coldest was 1994 at -9.3°C. Typical January days reach 0.5°C with nights near -8°C. The long-term trend is warming, about 0.7°C per decade.
January is one of the drier months in Waterbury, averaging 87 mm of rainfall. The wettest January on record was 2024 with 189 mm, while the driest was 1981 at 19 mm.
Relative humidity in Waterbury during January averages 88%. The most humid January was 1987 at 96%, and the least humid was 2025 at 78%.
January receives about 1.8 kWh/m²/day of solar energy in Waterbury. The sunniest Januarys were 2016, 2022 and 2025, among others at 2 kWh/m²/day, and the cloudiest were 2017, 2023 and 2024 at 1.5.
Average wind speed in Waterbury during January is 0.6 m/s. The windiest January was 2000 at 0.8 m/s, while the calmest were 1990 and 2023 at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -5.6°C | -3.2°C | -3.9°C | -3.6°C | -1.9°C | +3.7°C |
| Avg High | -1.2°C | 1.2°C | 0.3°C | 0.6°C | 2.2°C | +3.4°C |
| Avg Low | -10.1°C | -7.4°C | -8.1°C | -7.8°C | -5.9°C | +4.2°C |
| Avg Rain | 82 mm | 111 mm | 73 mm | 81 mm | 87 mm | +6 mm |
January temperatures in Waterbury have risen by about 4.4°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -29.5°C (1994) to a record high of 18.7°C (2007).
Rainfall in January is one of the drier months, averaging 87 mm, with a wettest year of 189 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 Waterbury
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Waterbury. That said, January — with days averaging 0.5°C and nights around -8°C (mean -3.7°C) and higher rainfall (87 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 | 0.2°C | -3.6°C | -7.4°C | 8.9°C | -16.8°C | 34 mm | 78% | 0.7 m/s | 2 |
| 2024 🌧️ | 2.6°C | -1.2°C | -5.0°C | 13.1°C | -12.6°C | 189 mm | 90% | 0.6 m/s | 1.5 |
| 2023 🔥 | 5.3°C | 1.5°C | -2.4°C | 12.6°C | -6.0°C | 138 mm | 90% | 0.5 m/s | 1.5 |
| 2022 | -0.3°C | -5.1°C | -9.8°C | 10.9°C | -19.1°C | 67 mm | 83% | 0.7 m/s | 2 |
| 2021 | 1.2°C | -2.6°C | -6.4°C | 5.8°C | -16.7°C | 45 mm | 88% | 0.6 m/s | 1.7 |
| 2020 | 4.1°C | -0.2°C | -4.5°C | 15.5°C | -12.0°C | 52 mm | 87% | 0.6 m/s | 1.8 |
| 2019 | 0.6°C | -3.8°C | -8.2°C | 11.8°C | -19.4°C | 127 mm | 87% | 0.7 m/s | 1.8 |
| 2018 | 0.2°C | -4.3°C | -8.8°C | 12.6°C | -23.1°C | 88 mm | 86% | 0.6 m/s | 1.8 |
| 2017 | 2.7°C | -0.5°C | -3.7°C | 12.6°C | -14.0°C | 82 mm | 87% | 0.6 m/s | 1.5 |
| 2016 | 2.1°C | -2.0°C | -6.1°C | 13.1°C | -15.6°C | 55 mm | 82% | 0.6 m/s | 2 |
| 2015 | -1.7°C | -6.3°C | -10.9°C | 5.9°C | -20.5°C | 99 mm | 88% | 0.7 m/s | 1.8 |
| 2014 | -0.9°C | -5.4°C | -9.9°C | 11.5°C | -21.1°C | 76 mm | 84% | 0.6 m/s | 1.8 |
| 2013 | 1.3°C | -2.8°C | -6.9°C | 13.6°C | -20.2°C | 55 mm | 87% | 0.6 m/s | 1.9 |
| 2012 | 3.0°C | -1.2°C | -5.5°C | 10.7°C | -15.6°C | 74 mm | 87% | 0.6 m/s | 2 |
| 2011 | -2.3°C | -6.5°C | -10.7°C | 7.2°C | -26.9°C | 86 mm | 95% | 0.6 m/s | 1.8 |
| 2010 | 0.5°C | -3.6°C | -7.8°C | 12.7°C | -16.1°C | 67 mm | 87% | 0.7 m/s | 1.8 |
| 2009 | -2.3°C | -6.6°C | -10.9°C | 2.3°C | -20.8°C | 65 mm | 90% | 0.6 m/s | 2 |
| 2008 | 2.7°C | -1.5°C | -5.7°C | 14.8°C | -16.0°C | 58 mm | 86% | 0.6 m/s | 2 |
| 2007 | 3.2°C | -0.8°C | -4.9°C | 18.7°C | -17.6°C | 87 mm | 86% | 0.6 m/s | 1.8 |
| 2006 | 4.1°C | -0.1°C | -4.2°C | 13.2°C | -15.1°C | 140 mm | 94% | 0.6 m/s | 1.7 |
| 2005 | -0.9°C | -5.2°C | -9.5°C | 12.7°C | -23.6°C | 109 mm | 91% | 0.6 m/s | 1.7 |
| 2004 | -4.2°C | -7.9°C | -11.6°C | 7.7°C | -21.9°C | 45 mm | 88% | 0.7 m/s | 1.8 |
| 2003 | -3.3°C | -7.6°C | -11.9°C | 2.5°C | -23.6°C | 57 mm | 92% | 0.7 m/s | 1.9 |
| 2002 | 4.5°C | 0.5°C | -3.4°C | 17.6°C | -11.5°C | 44 mm | 84% | 0.6 m/s | 1.7 |
| 2001 | -0.2°C | -4.8°C | -9.5°C | 6.0°C | -16.2°C | 53 mm | 95% | 0.6 m/s | 1.9 |
| 2000 | -0.3°C | -4.7°C | -9.0°C | 14.2°C | -20.9°C | 73 mm | 84% | 0.8 m/s | 1.8 |
| 1999 | 2.1°C | -2.6°C | -7.3°C | 13.6°C | -17.2°C | 169 mm | 85% | 0.6 m/s | 1.8 |
| 1998 | 3.9°C | -0.1°C | -4.1°C | 14.9°C | -15.7°C | 106 mm | 90% | 0.6 m/s | 1.6 |
| 1997 | 0.5°C | -3.7°C | -7.9°C | 10.1°C | -19.3°C | 93 mm | 86% | 0.7 m/s | 1.7 |
| 1996 | -1.2°C | -5.8°C | -10.4°C | 12.4°C | -25.6°C | 163 mm | 94% | 0.7 m/s | 1.6 |
| 1995 | 2.7°C | -1.0°C | -4.7°C | 15.1°C | -13.2°C | 105 mm | 90% | 0.6 m/s | 1.8 |
| 1994 ❄️ | -4.0°C | -9.3°C | -14.5°C | 8.6°C | -29.5°C | 143 mm | 95% | 0.7 m/s | 1.7 |
| 1993 | 1.8°C | -2.4°C | -6.6°C | 13.2°C | -13.3°C | 69 mm | 88% | 0.6 m/s | 1.7 |
| 1992 | 1.9°C | -2.6°C | -7.0°C | 13.5°C | -14.6°C | 65 mm | 85% | 0.6 m/s | 1.8 |
| 1991 | 0.5°C | -3.8°C | -8.0°C | 8.1°C | -18.1°C | 74 mm | 87% | 0.6 m/s | 1.8 |
| 1990 | 3.3°C | -0.3°C | -3.9°C | 11.5°C | -10.2°C | 119 mm | 91% | 0.5 m/s | 1.6 |
| 1989 | 2.1°C | -2.1°C | -6.2°C | 9.9°C | -16.8°C | 45 mm | 86% | 0.6 m/s | 1.7 |
| 1988 | -1.7°C | -5.9°C | -10.2°C | 6.5°C | -21.0°C | 78 mm | 91% | 0.6 m/s | 1.8 |
| 1987 | -1.5°C | -5.9°C | -10.4°C | 8.2°C | -24.3°C | 136 mm | 96% | 0.7 m/s | 1.6 |
| 1986 | 1.0°C | -3.5°C | -8.0°C | 10.2°C | -18.7°C | 121 mm | 85% | 0.7 m/s | 1.9 |
| 1985 | -1.8°C | -5.9°C | -10.0°C | 9.1°C | -18.0°C | 28 mm | 84% | 0.7 m/s | 1.9 |
| 1984 | -1.9°C | -6.5°C | -11.2°C | 6.2°C | -22.9°C | 50 mm | 93% | 0.6 m/s | 1.7 |
| 1983 | 1.2°C | -3.1°C | -7.4°C | 11.0°C | -17.9°C | 122 mm | 85% | 0.6 m/s | — |
| 1982 | -4.2°C | -8.9°C | -13.6°C | 12.4°C | -24.7°C | 137 mm | 91% | 0.7 m/s | — |
| 1981 | -3.8°C | -8.7°C | -13.5°C | 4.7°C | -23.4°C | 19 mm | 86% | 0.7 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 0.5°C with lows near -8°C (mean -3.7°C), based on 45 years of NASA POWER data.
January averages 87 mm of rainfall in Waterbury, one of the drier months. The wettest on record was 189 mm in 2024.
The hottest January reached 18.7°C in 2007. The coldest dipped to -29.5°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 4.4°C. Daytime highs moved from -2.1°C to 1.8°C and overnight lows from -11.1°C to -6.2°C over the same span.
January is one of the cooler months of the year in Waterbury and one of the drier months, so plan for around 0.5°C daytime highs and -8°C at night.
Yes — January is the coldest month of the year in Waterbury, averaging -3.7°C.
For January in Waterbury, pack warm layers and a jacket for chilly mornings, with typical highs of 0.5°C and lows of -8°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 88% — quite humid.
Average wind speed in January is 0.6 m/s. The windiest January on record averaged 0.8 m/s (2000).
The wettest January on record was 2024 with 189 mm. On average, January sees 87 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 Waterbury 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.
