December is one of the cooler months of the year in West Haven, with average highs near 3.7°C and lows around -4.2°C (mean -0.2°C). It is about average for rainfall, averaging 104 mm of rainfall and 86% relative humidity across the period.
December is one of the cooler months of the year in West Haven. Across 45 years of records, the warmest December in West Haven was 2015 — when the month averaged 6.4°C — while the coldest was 1989 at -7.7°C. Typical December days reach 3.7°C with nights near -4.2°C. The long-term trend is warming, about 0.5°C per decade.
December is about average for rainfall in West Haven, averaging 104 mm of rainfall. The wettest December on record was 2023 with 223 mm, while the driest was 1998 at 32 mm.
Relative humidity in West Haven during December averages 86%. The most humid December was 1996 at 93%, and the least humid was 2000 at 78%.
December receives about 1.6 kWh/m²/day of solar energy in West Haven. The sunniest Decembers were 1989, 2000 and 2024 at 1.8 kWh/m²/day, and the cloudiest were 1984 and 2014 at 1.3.
Average wind speed in West Haven during December is 0.3 m/s. The windiest Decembers were 2020, 2022 and 2025, among others at 0.4 m/s, while the calmest were 2021, 2023 and 2024, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -1.7°C | 0.1°C | -0.5°C | 0.4°C | 0.6°C | +2.3°C |
| Avg High | 2.2°C | 4.0°C | 3.5°C | 4.2°C | 4.6°C | +2.4°C |
| Avg Low | -5.7°C | -3.9°C | -4.6°C | -3.4°C | -3.4°C | +2.3°C |
| Avg Rain | 82 mm | 103 mm | 105 mm | 114 mm | 122 mm | +40 mm |
December temperatures in West Haven have risen by about 1.9°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -19.9°C (1989) to a record high of 20.7°C (1998).
Rainfall in December is about average for rainfall, averaging 104 mm, with a wettest year of 223 mm.
A quieter season to visit West Haven
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting West Haven. That said, December — with days averaging 3.7°C and nights around -4.2°C (mean -0.2°C) and higher rainfall (104 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 | 1.4°C | -2.7°C | -6.9°C | 13.0°C | -13.4°C | 87 mm | 83% | 0.4 m/s | — |
| 2024 | 4.0°C | -0.1°C | -4.1°C | 15.8°C | -14.4°C | 130 mm | 83% | 0.3 m/s | 1.8 |
| 2023 🌧️ | 7.4°C | 3.4°C | -0.5°C | 16.5°C | -6.1°C | 223 mm | 89% | 0.3 m/s | 1.4 |
| 2022 | 4.5°C | 0.3°C | -4.0°C | 13.4°C | -14.7°C | 111 mm | 84% | 0.4 m/s | 1.7 |
| 2021 | 6.3°C | 2.6°C | -1.1°C | 14.7°C | -6.1°C | 50 mm | 83% | 0.3 m/s | 1.5 |
| 2020 | 4.1°C | 0.2°C | -3.7°C | 15.4°C | -16.5°C | 129 mm | 88% | 0.4 m/s | 1.5 |
| 2019 | 3.0°C | -0.6°C | -4.2°C | 13.1°C | -12.8°C | 174 mm | 91% | 0.3 m/s | 1.4 |
| 2018 | 4.1°C | 0.3°C | -3.5°C | 13.8°C | -9.5°C | 146 mm | 90% | 0.3 m/s | 1.7 |
| 2017 | 1.4°C | -2.3°C | -5.9°C | 12.9°C | -16.3°C | 52 mm | 81% | 0.4 m/s | 1.5 |
| 2016 | 3.4°C | -0.4°C | -4.3°C | 14.3°C | -13.2°C | 78 mm | 84% | 0.3 m/s | 1.6 |
| 2015 🔥 | 10.3°C | 6.4°C | 2.5°C | 19.8°C | -3.1°C | 107 mm | 87% | 0.3 m/s | 1.4 |
| 2014 | 4.3°C | 0.9°C | -2.6°C | 12.9°C | -8.8°C | 126 mm | 88% | 0.3 m/s | 1.3 |
| 2013 | 2.5°C | -1.5°C | -5.4°C | 14.1°C | -16.2°C | 98 mm | 89% | 0.3 m/s | 1.4 |
| 2012 | 5.5°C | 1.7°C | -2.1°C | 14.1°C | -9.4°C | 131 mm | 87% | 0.4 m/s | 1.4 |
| 2011 | 6.5°C | 2.3°C | -2.0°C | 13.7°C | -8.3°C | 112 mm | 89% | 0.3 m/s | 1.7 |
| 2010 | 0.8°C | -2.8°C | -6.4°C | 14.4°C | -12.3°C | 114 mm | 84% | 0.4 m/s | 1.7 |
| 2009 | 2.3°C | -1.5°C | -5.4°C | 16.4°C | -13.4°C | 135 mm | 84% | 0.4 m/s | 1.6 |
| 2008 | 3.8°C | -0.4°C | -4.6°C | 14.3°C | -14.6°C | 167 mm | 89% | 0.4 m/s | 1.4 |
| 2007 | 2.0°C | -1.5°C | -5.1°C | 11.7°C | -13.9°C | 127 mm | 89% | 0.3 m/s | 1.4 |
| 2006 | 7.0°C | 2.8°C | -1.5°C | 17.4°C | -8.8°C | 54 mm | 87% | 0.3 m/s | 1.6 |
| 2005 | 2.0°C | -1.9°C | -5.9°C | 11.4°C | -17.9°C | 101 mm | 90% | 0.4 m/s | 1.7 |
| 2004 | 3.6°C | -0.7°C | -5.0°C | 13.0°C | -16.2°C | 97 mm | 87% | 0.3 m/s | 1.5 |
| 2003 | 3.6°C | -0.2°C | -4.0°C | 11.8°C | -9.3°C | 122 mm | 87% | 0.4 m/s | 1.7 |
| 2002 | 1.9°C | -1.8°C | -5.5°C | 13.1°C | -12.7°C | 104 mm | 88% | 0.4 m/s | 1.6 |
| 2001 | 7.6°C | 3.1°C | -1.4°C | 19.7°C | -8.4°C | 52 mm | 79% | 0.3 m/s | 1.7 |
| 2000 | 0.9°C | -3.3°C | -7.5°C | 15.7°C | -12.7°C | 96 mm | 78% | 0.4 m/s | 1.8 |
| 1999 | 5.0°C | 0.9°C | -3.2°C | 14.0°C | -11.9°C | 60 mm | 82% | 0.3 m/s | 1.6 |
| 1998 | 6.7°C | 2.2°C | -2.3°C | 20.7°C | -12.2°C | 32 mm | 79% | 0.3 m/s | 1.5 |
| 1997 | 3.4°C | -0.6°C | -4.5°C | 9.9°C | -13.4°C | 79 mm | 87% | 0.3 m/s | 1.7 |
| 1996 | 4.3°C | 1.1°C | -2.2°C | 13.0°C | -13.6°C | 182 mm | 93% | 0.3 m/s | 1.4 |
| 1995 | -0.6°C | -4.2°C | -7.7°C | 6.9°C | -12.7°C | 57 mm | 90% | 0.4 m/s | 1.7 |
| 1994 | 5.3°C | 0.9°C | -3.4°C | 14.6°C | -13.0°C | 110 mm | 84% | 0.3 m/s | 1.5 |
| 1993 | 3.2°C | -0.9°C | -4.9°C | 12.0°C | -15.0°C | 127 mm | 85% | 0.4 m/s | 1.5 |
| 1992 | 2.9°C | -0.7°C | -4.3°C | 8.7°C | -12.0°C | 138 mm | 88% | 0.4 m/s | 1.4 |
| 1991 | 4.4°C | 0.2°C | -4.0°C | 13.1°C | -12.6°C | 93 mm | 84% | 0.3 m/s | 1.6 |
| 1990 | 5.8°C | 1.6°C | -2.6°C | 15.8°C | -10.7°C | 146 mm | 86% | 0.3 m/s | 1.4 |
| 1989 ❄️ | -3.3°C | -7.7°C | -12.0°C | 4.6°C | -19.9°C | 34 mm | 83% | 0.4 m/s | 1.8 |
| 1988 | 2.2°C | -1.7°C | -5.6°C | 10.7°C | -16.8°C | 41 mm | 82% | 0.3 m/s | 1.6 |
| 1987 | 3.6°C | 0.0°C | -3.7°C | 10.6°C | -16.1°C | 53 mm | 85% | 0.3 m/s | 1.5 |
| 1986 | 3.6°C | -0.3°C | -4.2°C | 12.7°C | -11.7°C | 145 mm | 87% | 0.3 m/s | 1.5 |
| 1985 | 0.9°C | -3.1°C | -7.1°C | 8.4°C | -13.0°C | 43 mm | 85% | 0.3 m/s | 1.7 |
| 1984 | 6.0°C | 1.7°C | -2.6°C | 14.7°C | -9.5°C | 74 mm | 86% | 0.3 m/s | 1.3 |
| 1983 | 1.0°C | -2.7°C | -6.5°C | 13.9°C | -17.9°C | 179 mm | 88% | 0.4 m/s | — |
| 1982 | 5.8°C | 1.7°C | -2.3°C | 19.5°C | -13.6°C | 46 mm | 83% | 0.3 m/s | — |
| 1981 | 0.2°C | -3.4°C | -6.9°C | 9.8°C | -17.8°C | 120 mm | 92% | 0.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 3.7°C with lows near -4.2°C (mean -0.2°C), based on 45 years of NASA POWER data.
December averages 104 mm of rainfall in West Haven, about average for rainfall. The wettest on record was 223 mm in 2023.
The hottest December reached 20.7°C in 1998. The coldest dipped to -19.9°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.9°C. Daytime highs moved from 2.8°C to 4.7°C and overnight lows from -5.1°C to -3.3°C over the same span.
December is one of the cooler months of the year in West Haven and about average for rainfall, so plan for around 3.7°C daytime highs and -4.2°C at night.
Not quite — December is the 3rd coolest month in West Haven, averaging -0.2°C.
For December in West Haven, pack warm layers and a jacket for chilly mornings, with typical highs of 3.7°C and lows of -4.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 86% — quite humid.
Average wind speed in December is 0.3 m/s. The windiest December on record averaged 0.4 m/s (1983).
The wettest December on record was 2023 with 223 mm. On average, December sees 104 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 West Haven behaves each December, 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 December specifically, along with year-by-year records and how the month has changed over the decades.
