December is one of the cooler months of the year in Stamford, with average highs near 4.7°C and lows around -2.8°C (mean 1°C). It is about average for rainfall, averaging 105 mm of rainfall and 86% relative humidity across the period.
December is one of the cooler months of the year in Stamford. Across 45 years of records, the warmest December in Stamford was 2015 — when the month averaged 7.6°C — while the coldest was 1989 at -5.9°C. Typical December days reach 4.7°C with nights near -2.8°C. The long-term trend is warming, about 0.4°C per decade.
December is about average for rainfall in Stamford, averaging 105 mm of rainfall. The wettest December on record was 2023 with 220 mm, while the driest was 1989 at 27 mm.
Relative humidity in Stamford during December averages 86%. The most humid December was 1996 at 92%, and the least humid was 1998 at 77%.
December receives about 1.5 kWh/m²/day of solar energy in Stamford. The sunniest Decembers were 1989 and 2001 at 1.8 kWh/m²/day, and the cloudiest were 2013, 2014 and 2019, among others at 1.3.
Average wind speed in Stamford during December is 1.7 m/s. The windiest Decembers were 2003 and 2010 at 2.1 m/s, while the calmest were 2021 and 2023 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -0.3°C | 1.3°C | 0.7°C | 1.7°C | 1.7°C | +2°C |
| Avg High | 3.5°C | 5.2°C | 4.5°C | 5.3°C | 5.5°C | +2°C |
| Avg Low | -4.0°C | -2.5°C | -3.1°C | -1.9°C | -2.1°C | +1.9°C |
| Avg Rain | 80 mm | 100 mm | 110 mm | 120 mm | 119 mm | +39 mm |
December temperatures in Stamford have risen by about 1.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -17.1°C (1989) to a record high of 21.6°C (1998).
Rainfall in December is about average for rainfall, averaging 105 mm, with a wettest year of 220 mm.
A quieter season to visit Stamford
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Stamford. That said, December — with days averaging 4.7°C and nights around -2.8°C (mean 1°C) and higher rainfall (105 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 | 2.4°C | -1.4°C | -5.3°C | 12.4°C | -11.2°C | 84 mm | 82% | 1.8 m/s | — |
| 2024 | 4.9°C | 1.1°C | -2.7°C | 15.1°C | -13.3°C | 128 mm | 83% | 1.6 m/s | 1.7 |
| 2023 🌧️ | 7.8°C | 4.1°C | 0.4°C | 16.0°C | -4.8°C | 220 mm | 90% | 1.4 m/s | 1.4 |
| 2022 | 5.1°C | 1.1°C | -2.9°C | 13.9°C | -13.5°C | 120 mm | 85% | 1.9 m/s | 1.6 |
| 2021 | 7.6°C | 3.9°C | 0.2°C | 14.7°C | -5.5°C | 42 mm | 85% | 1.4 m/s | 1.5 |
| 2020 | 5.1°C | 1.3°C | -2.6°C | 15.4°C | -13.2°C | 117 mm | 88% | 1.8 m/s | 1.5 |
| 2019 | 4.1°C | 0.6°C | -2.8°C | 13.6°C | -10.9°C | 183 mm | 90% | 1.7 m/s | 1.3 |
| 2018 | 5.1°C | 1.7°C | -1.7°C | 14.0°C | -7.0°C | 179 mm | 89% | 1.6 m/s | 1.6 |
| 2017 | 2.7°C | -0.8°C | -4.2°C | 13.2°C | -16.0°C | 55 mm | 81% | 1.6 m/s | 1.4 |
| 2016 | 4.3°C | 0.6°C | -3.0°C | 14.5°C | -10.8°C | 85 mm | 85% | 1.7 m/s | 1.6 |
| 2015 🔥 | 11.3°C | 7.6°C | 4.0°C | 19.8°C | -2.5°C | 132 mm | 88% | 1.5 m/s | 1.4 |
| 2014 | 5.3°C | 2.0°C | -1.4°C | 13.7°C | -6.1°C | 121 mm | 88% | 1.6 m/s | 1.3 |
| 2013 | 4.1°C | 0.4°C | -3.3°C | 16.4°C | -10.8°C | 104 mm | 88% | 1.6 m/s | 1.3 |
| 2012 | 6.7°C | 3.2°C | -0.4°C | 14.7°C | -6.0°C | 138 mm | 88% | 1.8 m/s | 1.3 |
| 2011 | 7.4°C | 3.4°C | -0.7°C | 14.6°C | -5.7°C | 108 mm | 87% | 1.6 m/s | 1.7 |
| 2010 | 1.5°C | -1.9°C | -5.3°C | 15.3°C | -9.9°C | 92 mm | 83% | 2.1 m/s | 1.6 |
| 2009 | 3.6°C | -0.1°C | -3.8°C | 16.9°C | -11.1°C | 162 mm | 84% | 2 m/s | 1.6 |
| 2008 | 4.7°C | 0.6°C | -3.5°C | 15.2°C | -14.2°C | 161 mm | 88% | 1.9 m/s | 1.4 |
| 2007 | 3.3°C | 0.1°C | -3.2°C | 12.4°C | -9.4°C | 132 mm | 88% | 1.7 m/s | 1.4 |
| 2006 | 8.0°C | 3.8°C | -0.3°C | 17.5°C | -7.8°C | 52 mm | 86% | 1.6 m/s | 1.6 |
| 2005 | 2.9°C | -0.8°C | -4.5°C | 10.8°C | -14.8°C | 97 mm | 89% | 1.7 m/s | 1.6 |
| 2004 | 4.9°C | 0.9°C | -3.1°C | 13.3°C | -13.5°C | 87 mm | 87% | 1.9 m/s | 1.5 |
| 2003 | 4.5°C | 0.8°C | -2.9°C | 12.5°C | -8.2°C | 139 mm | 88% | 2.1 m/s | 1.6 |
| 2002 | 2.8°C | -0.8°C | -4.3°C | 12.8°C | -10.8°C | 117 mm | 88% | 1.8 m/s | 1.5 |
| 2001 | 8.9°C | 4.5°C | 0.1°C | 20.6°C | -7.8°C | 56 mm | 77% | 1.6 m/s | 1.8 |
| 2000 | 1.7°C | -2.0°C | -5.8°C | 15.5°C | -11.5°C | 97 mm | 79% | 1.9 m/s | 1.7 |
| 1999 | 6.0°C | 2.0°C | -1.9°C | 14.2°C | -9.4°C | 64 mm | 82% | 1.8 m/s | 1.6 |
| 1998 | 7.6°C | 3.3°C | -1.0°C | 21.6°C | -10.7°C | 31 mm | 77% | 1.5 m/s | 1.5 |
| 1997 | 4.5°C | 0.8°C | -3.0°C | 10.2°C | -10.8°C | 95 mm | 87% | 1.7 m/s | 1.7 |
| 1996 | 5.4°C | 2.4°C | -0.6°C | 12.8°C | -9.1°C | 193 mm | 92% | 1.7 m/s | 1.4 |
| 1995 | 0.9°C | -2.8°C | -6.5°C | 8.9°C | -10.8°C | 56 mm | 89% | 1.9 m/s | 1.7 |
| 1994 | 6.4°C | 2.2°C | -2.0°C | 15.0°C | -8.7°C | 82 mm | 85% | 1.7 m/s | 1.5 |
| 1993 | 4.1°C | 0.2°C | -3.6°C | 12.5°C | -14.0°C | 109 mm | 84% | 1.8 m/s | 1.4 |
| 1992 | 4.2°C | 0.7°C | -2.7°C | 10.9°C | -10.3°C | 126 mm | 86% | 1.9 m/s | 1.3 |
| 1991 | 5.7°C | 1.7°C | -2.3°C | 14.1°C | -11.5°C | 93 mm | 83% | 1.7 m/s | 1.6 |
| 1990 | 6.9°C | 2.8°C | -1.3°C | 16.3°C | -7.3°C | 149 mm | 86% | 1.9 m/s | 1.4 |
| 1989 ❄️ | -1.9°C | -5.9°C | -9.9°C | 5.1°C | -17.1°C | 27 mm | 83% | 1.8 m/s | 1.8 |
| 1988 | 3.5°C | -0.4°C | -4.2°C | 11.7°C | -15.4°C | 33 mm | 82% | 1.7 m/s | 1.5 |
| 1987 | 5.0°C | 1.3°C | -2.3°C | 11.8°C | -13.9°C | 55 mm | 86% | 1.8 m/s | 1.4 |
| 1986 | 4.9°C | 1.2°C | -2.4°C | 13.2°C | -7.8°C | 132 mm | 87% | 1.7 m/s | 1.5 |
| 1985 | 2.1°C | -1.6°C | -5.3°C | 9.6°C | -11.3°C | 38 mm | 84% | 1.7 m/s | 1.5 |
| 1984 | 7.3°C | 3.2°C | -0.9°C | 15.4°C | -7.2°C | 80 mm | 87% | 1.6 m/s | 1.3 |
| 1983 | 2.0°C | -1.4°C | -4.9°C | 13.6°C | -16.3°C | 196 mm | 87% | 1.9 m/s | — |
| 1982 | 6.7°C | 2.9°C | -0.8°C | 19.6°C | -10.1°C | 46 mm | 85% | 1.6 m/s | — |
| 1981 | 1.5°C | -2.1°C | -5.7°C | 10.3°C | -15.5°C | 110 mm | 90% | 1.7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 4.7°C with lows near -2.8°C (mean 1°C), based on 45 years of NASA POWER data.
December averages 105 mm of rainfall in Stamford, about average for rainfall. The wettest on record was 220 mm in 2023.
The hottest December reached 21.6°C in 1998. The coldest dipped to -17.1°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.6°C. Daytime highs moved from 3.9°C to 5.6°C and overnight lows from -3.5°C to -2.1°C over the same span.
December is one of the cooler months of the year in Stamford and about average for rainfall, so plan for around 4.7°C daytime highs and -2.8°C at night.
Not quite — December is the 3rd coolest month in Stamford, averaging 1°C.
For December in Stamford, pack warm layers and a jacket for chilly mornings, with typical highs of 4.7°C and lows of -2.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 86% — quite humid.
Average wind speed in December is 1.7 m/s. The windiest December on record averaged 2.1 m/s (2003).
The wettest December on record was 2023 with 220 mm. On average, December sees 105 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 Stamford 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.
