January is one of the cooler months of the year in Fairfield, with average highs near 2.5°C and lows around -3.1°C (mean -0.3°C). It is about average for rainfall, averaging 91 mm of rainfall and 84% relative humidity across the period.
January is one of the cooler months of the year in Fairfield. Across 45 years of records, the warmest January in Fairfield was 2023 — when the month averaged 4.1°C — while the coldest were 1981 and 1982 at -4.6°C. Typical January days reach 2.5°C with nights near -3.1°C. The long-term trend is warming, about 0.5°C per decade.
January is about average for rainfall in Fairfield, averaging 91 mm of rainfall. The wettest January on record was 1999 with 186 mm, while the driest was 1981 at 20 mm.
Relative humidity in Fairfield during January averages 84%. The most humid January was 1996 at 90%, and the least humid was 2025 at 76%.
January receives about 1.8 kWh/m²/day of solar energy in Fairfield. 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 Fairfield during January is 3.6 m/s. The windiest Januarys were 1997, 2000 and 2004 at 4.2 m/s, while the calmest were 1990 and 2023 at 3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -1.8°C | 0.2°C | -0.3°C | -0.4°C | 1.1°C | +2.9°C |
| Avg High | 1.0°C | 3.2°C | 2.4°C | 2.4°C | 3.8°C | +2.8°C |
| Avg Low | -4.7°C | -2.7°C | -3.1°C | -3.2°C | -1.6°C | +3.1°C |
| Avg Rain | 84 mm | 113 mm | 73 mm | 90 mm | 92 mm | +8 mm |
January temperatures in Fairfield have risen by about 3.6°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -15.9°C (1994) to a record high of 15.7°C (2007).
Rainfall in January is about average for rainfall, averaging 91 mm, with a wettest year of 186 mm.
A quieter season to visit Fairfield
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Fairfield. That said, January — with days averaging 2.5°C and nights around -3.1°C (mean -0.3°C) and higher rainfall (91 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 | 1.5°C | -0.8°C | -3.1°C | 8.9°C | -9.5°C | 27 mm | 76% | 4 m/s | 2 |
| 2024 | 4.1°C | 1.5°C | -1.0°C | 13.5°C | -8.0°C | 181 mm | 85% | 3.5 m/s | 1.5 |
| 2023 🔥 | 6.7°C | 4.1°C | 1.5°C | 12.4°C | -2.0°C | 141 mm | 86% | 3 m/s | 1.5 |
| 2022 | 2.0°C | -1.1°C | -4.3°C | 10.7°C | -11.3°C | 89 mm | 79% | 3.8 m/s | 2 |
| 2021 | 3.1°C | 0.5°C | -2.1°C | 8.0°C | -10.1°C | 56 mm | 84% | 3.6 m/s | 1.7 |
| 2020 | 5.2°C | 2.4°C | -0.4°C | 13.8°C | -7.0°C | 59 mm | 83% | 3.2 m/s | 1.8 |
| 2019 | 2.5°C | -0.6°C | -3.7°C | 11.9°C | -14.3°C | 131 mm | 82% | 3.9 m/s | 1.8 |
| 2018 | 1.5°C | -1.5°C | -4.5°C | 11.4°C | -15.4°C | 111 mm | 85% | 3.7 m/s | 1.8 |
| 2017 | 4.3°C | 2.1°C | -0.1°C | 11.4°C | -8.8°C | 108 mm | 84% | 3.4 m/s | 1.5 |
| 2016 | 3.6°C | 0.8°C | -2.0°C | 12.8°C | -9.3°C | 75 mm | 79% | 3.8 m/s | 2 |
| 2015 | 0.6°C | -2.4°C | -5.3°C | 9.3°C | -12.3°C | 122 mm | 83% | 4 m/s | 1.8 |
| 2014 | 0.8°C | -2.3°C | -5.4°C | 10.0°C | -12.7°C | 73 mm | 84% | 3.6 m/s | 1.8 |
| 2013 | 3.3°C | 0.7°C | -1.8°C | 13.2°C | -9.8°C | 57 mm | 83% | 3.4 m/s | 1.9 |
| 2012 | 5.2°C | 2.0°C | -1.1°C | 10.9°C | -8.9°C | 71 mm | 83% | 3.7 m/s | 2 |
| 2011 | 0.3°C | -2.3°C | -4.8°C | 8.1°C | -14.5°C | 95 mm | 86% | 3.3 m/s | 1.8 |
| 2010 | 2.0°C | -0.7°C | -3.4°C | 11.8°C | -10.0°C | 58 mm | 83% | 3.6 m/s | 1.8 |
| 2009 | 0.1°C | -2.5°C | -5.2°C | 5.8°C | -12.5°C | 71 mm | 83% | 3.5 m/s | 2 |
| 2008 | 4.0°C | 1.2°C | -1.6°C | 13.0°C | -10.2°C | 57 mm | 81% | 3.5 m/s | 2 |
| 2007 | 4.8°C | 2.0°C | -0.7°C | 15.7°C | -12.0°C | 94 mm | 82% | 3.6 m/s | 1.8 |
| 2006 | 5.6°C | 2.8°C | -0.1°C | 13.3°C | -9.6°C | 123 mm | 89% | 3.6 m/s | 1.7 |
| 2005 | 1.8°C | -1.2°C | -4.1°C | 12.0°C | -13.4°C | 95 mm | 87% | 3.6 m/s | 1.7 |
| 2004 | -1.5°C | -4.1°C | -6.8°C | 9.0°C | -14.7°C | 43 mm | 86% | 4.2 m/s | 1.8 |
| 2003 | -0.2°C | -2.8°C | -5.4°C | 6.3°C | -12.8°C | 54 mm | 84% | 4.1 m/s | 1.9 |
| 2002 | 5.8°C | 3.2°C | 0.6°C | 14.6°C | -4.6°C | 58 mm | 80% | 3.4 m/s | 1.7 |
| 2001 | 1.9°C | -0.8°C | -3.4°C | 7.2°C | -7.8°C | 68 mm | 87% | 3.1 m/s | 1.9 |
| 2000 | 1.9°C | -1.2°C | -4.2°C | 13.0°C | -13.5°C | 70 mm | 83% | 4.2 m/s | 1.8 |
| 1999 🌧️ | 4.0°C | 0.6°C | -2.8°C | 12.0°C | -10.3°C | 186 mm | 83% | 3.7 m/s | 1.8 |
| 1998 | 5.5°C | 2.9°C | 0.3°C | 13.1°C | -8.6°C | 139 mm | 86% | 3.4 m/s | 1.6 |
| 1997 | 2.7°C | -0.5°C | -3.6°C | 9.8°C | -12.9°C | 92 mm | 83% | 4.2 m/s | 1.7 |
| 1996 | 1.1°C | -2.0°C | -5.1°C | 11.3°C | -14.8°C | 141 mm | 90% | 3.8 m/s | 1.6 |
| 1995 | 4.5°C | 2.1°C | -0.3°C | 12.2°C | -7.8°C | 84 mm | 84% | 3.6 m/s | 1.8 |
| 1994 | -0.7°C | -4.2°C | -7.7°C | 9.0°C | -15.9°C | 140 mm | 90% | 3.9 m/s | 1.7 |
| 1993 | 3.6°C | 1.0°C | -1.7°C | 12.2°C | -5.8°C | 66 mm | 83% | 3.5 m/s | 1.7 |
| 1992 | 3.6°C | 0.5°C | -2.6°C | 11.8°C | -9.5°C | 61 mm | 80% | 3.7 m/s | 1.8 |
| 1991 | 3.0°C | 0.1°C | -2.8°C | 9.1°C | -11.9°C | 95 mm | 83% | 3.5 m/s | 1.8 |
| 1990 | 4.2°C | 1.7°C | -0.8°C | 9.9°C | -4.3°C | 124 mm | 88% | 3 m/s | 1.6 |
| 1989 | 3.9°C | 1.0°C | -1.9°C | 8.9°C | -11.5°C | 50 mm | 82% | 3.4 m/s | 1.7 |
| 1988 | 0.8°C | -1.8°C | -4.3°C | 6.6°C | -14.3°C | 86 mm | 84% | 3.5 m/s | 1.8 |
| 1987 | 1.4°C | -1.3°C | -3.9°C | 8.8°C | -12.5°C | 151 mm | 88% | 3.9 m/s | 1.6 |
| 1986 | 2.5°C | -0.5°C | -3.6°C | 9.1°C | -12.9°C | 108 mm | 82% | 3.7 m/s | 1.9 |
| 1985 | 0.3°C | -2.4°C | -5.2°C | 10.4°C | -14.8°C | 30 mm | 81% | 4 m/s | 1.9 |
| 1984 | 0.1°C | -2.6°C | -5.2°C | 6.2°C | -13.2°C | 56 mm | 89% | 3.1 m/s | 1.7 |
| 1983 | 3.0°C | 0.2°C | -2.6°C | 11.7°C | -12.1°C | 112 mm | 81% | 3.5 m/s | — |
| 1982 | -1.3°C | -4.6°C | -7.8°C | 12.8°C | -15.3°C | 145 mm | 87% | 4.1 m/s | — |
| 1981 ❄️ | -1.5°C | -4.6°C | -7.7°C | 5.4°C | -15.3°C | 20 mm | 84% | 3.5 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 2.5°C with lows near -3.1°C (mean -0.3°C), based on 45 years of NASA POWER data.
January averages 91 mm of rainfall in Fairfield, about average for rainfall. The wettest on record was 186 mm in 1999.
The hottest January reached 15.7°C in 2007. The coldest dipped to -15.9°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 3.6°C. Daytime highs moved from 0.1°C to 3.5°C and overnight lows from -5.7°C to -1.8°C over the same span.
January is one of the cooler months of the year in Fairfield and about average for rainfall, so plan for around 2.5°C daytime highs and -3.1°C at night.
Yes — January is the coldest month of the year in Fairfield, averaging -0.3°C.
For January in Fairfield, pack warm layers and a jacket for chilly mornings, with typical highs of 2.5°C and lows of -3.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 84% — quite humid.
Average wind speed in January is 3.6 m/s. The windiest January on record averaged 4.2 m/s (1997).
The wettest January on record was 1999 with 186 mm. On average, January sees 91 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 Fairfield 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.
