January is one of the cooler months of the year in Truro, with average highs near -2.4°C and lows around -10.3°C (mean -6.4°C). It is about average for rainfall, averaging 70 mm of rainfall and 89% relative humidity across the period.
January is one of the cooler months of the year in Truro. Across 45 years of records, the warmest January in Truro was 2023 — when the month averaged -1.7°C — while the coldest was 1985 at -11°C. Typical January days reach -2.4°C with nights near -10.3°C. The long-term trend is warming, about 0.7°C per decade.
January is about average for rainfall in Truro, averaging 70 mm of rainfall. The wettest January on record was 1984 with 128 mm, while the driest was 1989 at 25 mm.
Relative humidity in Truro during January averages 89%. The most humid January was 2001 at 99%, and the least humid was 1999 at 81%.
January receives about 1.3 kWh/m²/day of solar energy in Truro. The sunniest Januarys were 1985 and 2004 at 1.6 kWh/m²/day, and the cloudiest was 1993 at 1.
Average wind speed in Truro during January is 0.7 m/s. The windiest Januarys were 2013, 2016 and 2024, among others at 0.8 m/s, while the calmest were 2019, 2021 and 2023, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -7.4°C | -6.7°C | -6.9°C | -5.6°C | -4.4°C | +3°C |
| Avg High | -3.3°C | -2.3°C | -3.1°C | -1.7°C | -0.8°C | +2.5°C |
| Avg Low | -11.6°C | -11.1°C | -10.6°C | -9.4°C | -8.1°C | +3.5°C |
| Avg Rain | 73 mm | 60 mm | 82 mm | 71 mm | 61 mm | -13 mm |
January temperatures in Truro have risen by about 4.3°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -28.3°C (1982) to a record high of 14°C (2006).
Rainfall in January is about average for rainfall, averaging 70 mm, with a wettest year of 128 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.9°C per decade, narrowing the gap between day and night.
A quieter season to visit Truro
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Truro. That said, January — with days averaging -2.4°C and nights around -10.3°C (mean -6.4°C) and moderate rainfall (70 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 | -2.3°C | -5.4°C | -8.6°C | 4.9°C | -16.2°C | 38 mm | 87% | 0.7 m/s | 1.4 |
| 2024 | -0.9°C | -4.4°C | -7.9°C | 6.3°C | -13.0°C | 36 mm | 86% | 0.8 m/s | 1.4 |
| 2023 🔥 | 1.7°C | -1.7°C | -5.0°C | 9.7°C | -12.3°C | 112 mm | 89% | 0.5 m/s | 1.2 |
| 2022 | -1.0°C | -6.2°C | -11.4°C | 8.2°C | -20.5°C | 82 mm | 87% | 0.6 m/s | 1.3 |
| 2021 | -0.6°C | -3.5°C | -6.3°C | 2.9°C | -13.0°C | 42 mm | 88% | 0.5 m/s | 1.3 |
| 2020 | -1.7°C | -5.5°C | -9.4°C | 8.4°C | -20.9°C | 53 mm | 92% | 0.6 m/s | 1.2 |
| 2019 | -1.4°C | -6.1°C | -10.8°C | 10.0°C | -16.9°C | 74 mm | 89% | 0.5 m/s | 1.3 |
| 2018 | -1.4°C | -5.7°C | -10.1°C | 13.6°C | -19.3°C | 74 mm | 86% | 0.6 m/s | 1.3 |
| 2017 | -0.9°C | -4.5°C | -8.1°C | 7.8°C | -20.3°C | 67 mm | 88% | 0.5 m/s | 1.4 |
| 2016 | -2.0°C | -5.4°C | -8.8°C | 8.2°C | -16.7°C | 82 mm | 94% | 0.8 m/s | 1.4 |
| 2015 | -2.3°C | -6.8°C | -11.4°C | 8.1°C | -17.4°C | 85 mm | 86% | 0.7 m/s | 1.4 |
| 2014 | -1.3°C | -5.6°C | -9.9°C | 10.3°C | -22.6°C | 89 mm | 89% | 0.7 m/s | 1.3 |
| 2013 | -3.5°C | -7.4°C | -11.3°C | 11.1°C | -19.3°C | 30 mm | 89% | 0.8 m/s | 1.3 |
| 2012 | -0.1°C | -4.2°C | -8.2°C | 8.7°C | -14.4°C | 53 mm | 86% | 0.7 m/s | 1.4 |
| 2011 | -2.4°C | -5.5°C | -8.6°C | 2.1°C | -19.8°C | 78 mm | 95% | 0.8 m/s | 1.3 |
| 2010 | -1.4°C | -4.4°C | -7.3°C | 7.8°C | -15.9°C | 74 mm | 92% | 0.8 m/s | 1.3 |
| 2009 | -4.4°C | -8.3°C | -12.2°C | 6.2°C | -21.2°C | 91 mm | 89% | 0.7 m/s | 1.5 |
| 2008 | -1.6°C | -4.9°C | -8.2°C | 8.2°C | -17.7°C | 102 mm | 93% | 0.7 m/s | 1.3 |
| 2007 | -1.5°C | -5.4°C | -9.2°C | 11.4°C | -20.6°C | 114 mm | 88% | 0.8 m/s | 1.4 |
| 2006 | 1.5°C | -2.2°C | -5.8°C | 14.0°C | -10.6°C | 80 mm | 91% | 0.7 m/s | 1.2 |
| 2005 | -5.2°C | -8.6°C | -12.0°C | 8.7°C | -22.0°C | 68 mm | 91% | 0.7 m/s | 1.4 |
| 2004 | -7.1°C | -10.6°C | -14.1°C | 2.3°C | -23.9°C | 27 mm | 88% | 0.7 m/s | 1.6 |
| 2003 | -5.4°C | -9.5°C | -13.5°C | 2.3°C | -21.5°C | 48 mm | 95% | 0.7 m/s | 1.4 |
| 2002 | -2.5°C | -6.1°C | -9.6°C | 2.2°C | -17.0°C | 96 mm | 96% | 0.6 m/s | 1.2 |
| 2001 | -4.0°C | -8.0°C | -12.0°C | -0.4°C | -18.4°C | 73 mm | 99% | 0.6 m/s | 1.5 |
| 2000 | -1.3°C | -5.5°C | -9.8°C | 11.1°C | -18.1°C | 124 mm | 89% | 0.7 m/s | 1.2 |
| 1999 | -0.5°C | -4.8°C | -9.2°C | 10.9°C | -21.1°C | 76 mm | 81% | 0.6 m/s | 1.3 |
| 1998 | -2.0°C | -6.0°C | -9.9°C | 8.1°C | -19.5°C | 113 mm | 93% | 0.6 m/s | 1.3 |
| 1997 | -2.2°C | -7.0°C | -11.9°C | 9.2°C | -18.9°C | 51 mm | 84% | 0.7 m/s | 1.2 |
| 1996 | -2.5°C | -7.1°C | -11.8°C | 10.4°C | -20.7°C | 51 mm | 84% | 0.6 m/s | 1.1 |
| 1995 | -0.7°C | -4.2°C | -7.8°C | 12.1°C | -19.2°C | 65 mm | 92% | 0.5 m/s | 1.4 |
| 1994 | -4.0°C | -9.2°C | -14.4°C | 9.1°C | -22.4°C | 54 mm | 83% | 0.7 m/s | 1.2 |
| 1993 | -3.2°C | -7.6°C | -11.9°C | 10.3°C | -24.2°C | 38 mm | 85% | 0.6 m/s | 1 |
| 1992 | -3.7°C | -7.9°C | -12.0°C | 8.2°C | -21.4°C | 47 mm | 85% | 0.6 m/s | 1.4 |
| 1991 | -4.3°C | -9.0°C | -13.8°C | 3.5°C | -23.1°C | 52 mm | 87% | 0.6 m/s | 1.4 |
| 1990 | -0.1°C | -4.3°C | -8.5°C | 8.9°C | -17.5°C | 58 mm | 87% | 0.6 m/s | 1.2 |
| 1989 | -1.5°C | -6.0°C | -10.5°C | 5.6°C | -18.3°C | 25 mm | 85% | 0.6 m/s | 1.3 |
| 1988 | -1.8°C | -6.1°C | -10.4°C | 7.5°C | -22.5°C | 31 mm | 89% | 0.6 m/s | 1.3 |
| 1987 | -3.3°C | -6.9°C | -10.5°C | 5.3°C | -18.9°C | 43 mm | 89% | 0.6 m/s | 1.1 |
| 1986 | -0.8°C | -5.4°C | -9.9°C | 11.3°C | -23.9°C | 80 mm | 87% | 0.7 m/s | 1.2 |
| 1985 ❄️ | -7.2°C | -11.0°C | -14.9°C | 0.4°C | -21.7°C | 72 mm | 99% | 0.7 m/s | 1.6 |
| 1984 🌧️ | -3.3°C | -7.6°C | -11.9°C | 2.4°C | -23.3°C | 128 mm | 96% | 0.5 m/s | 1.2 |
| 1983 | -1.4°C | -4.9°C | -8.5°C | 9.8°C | -18.2°C | 93 mm | 88% | 0.6 m/s | — |
| 1982 | -5.8°C | -10.2°C | -14.5°C | 7.8°C | -28.3°C | 110 mm | 94% | 0.7 m/s | — |
| 1981 | -4.5°C | -8.9°C | -13.4°C | 6.2°C | -26.3°C | 78 mm | 93% | 0.7 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around -2.4°C with lows near -10.3°C (mean -6.4°C), based on 45 years of NASA POWER data.
January averages 70 mm of rainfall in Truro, about average for rainfall. The wettest on record was 128 mm in 1984.
The hottest January reached 14°C in 2006. The coldest dipped to -28.3°C in 1982.
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 -4.4°C to -0.6°C and overnight lows from -12.6°C to -7.8°C over the same span.
January is one of the cooler months of the year in Truro and about average for rainfall, so plan for around -2.4°C daytime highs and -10.3°C at night.
Yes — January is the coldest month of the year in Truro, averaging -6.4°C.
For January in Truro, pack warm layers and a jacket for chilly mornings, with typical highs of -2.4°C and lows of -10.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 89% — quite humid.
Average wind speed in January is 0.7 m/s. The windiest January on record averaged 0.8 m/s (2007).
The wettest January on record was 1984 with 128 mm. On average, January sees 70 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 Truro 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.
