December is one of the cooler months of the year in Hanover, with average highs near -9.1°C and lows around -17.8°C (mean -13.4°C). It is one of the drier months, averaging 21 mm of rainfall and 92% relative humidity across the period.
December is one of the cooler months of the year in Hanover. Across 45 years of records, the warmest December in Hanover was 2023 — when the month averaged -5.5°C — while the coldest was 2000 at -22.6°C. Typical December days reach -9.1°C with nights near -17.8°C. The long-term trend is warming, about 0.8°C per decade.
December is one of the drier months in Hanover, averaging 21 mm of rainfall. The wettest December on record was 2004 with 42 mm, while the driest was 1983 at 8 mm.
Relative humidity in Hanover during December averages 92%. The most humid December was 1986 at 98%, and the least humid was 2011 at 85%.
December receives about 1 kWh/m²/day of solar energy in Hanover. The sunniest Decembers were 2008 and 2019 at 1.2 kWh/m²/day, and the cloudiest were 1990 and 1994 at 0.8.
Average wind speed in Hanover during December is 3.2 m/s. The windiest Decembers were 1990, 2004 and 2025 at 3.7 m/s, while the calmest were 1981, 2012 and 2015 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -15.7°C | -13.2°C | -13.3°C | -13.2°C | -11.4°C | +4.3°C |
| Avg High | -11.2°C | -8.9°C | -8.9°C | -8.9°C | -7.1°C | +4.1°C |
| Avg Low | -20.1°C | -17.5°C | -17.7°C | -17.5°C | -15.7°C | +4.4°C |
| Avg Rain | 17 mm | 22 mm | 27 mm | 17 mm | 23 mm | +6 mm |
December temperatures in Hanover have risen by about 5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -41.3°C (2013) to a record high of 6.2°C (1998).
Rainfall in December is one of the drier months, averaging 21 mm, with a wettest year of 42 mm.
A quieter season to visit Hanover
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Hanover. That said, December — with days averaging -9.1°C and nights around -17.8°C (mean -13.4°C) and low rainfall (21 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 | -10.3°C | -15.3°C | -20.3°C | 3.1°C | -30.4°C | 35 mm | 89% | 3.7 m/s | — |
| 2024 | -8.2°C | -12.2°C | -16.2°C | 1.9°C | -35.1°C | 24 mm | 93% | 3.4 m/s | 1 |
| 2023 🔥 | -1.7°C | -5.5°C | -9.2°C | 5.0°C | -17.1°C | 15 mm | 91% | 3.3 m/s | 0.9 |
| 2022 | -10.0°C | -13.9°C | -17.8°C | 0.3°C | -31.7°C | 23 mm | 91% | 3.4 m/s | 1 |
| 2021 | -8.2°C | -12.8°C | -17.3°C | 3.6°C | -37.3°C | 22 mm | 88% | 3.3 m/s | 1.1 |
| 2020 | -4.1°C | -8.7°C | -13.3°C | 3.1°C | -33.1°C | 19 mm | 89% | 3.1 m/s | 0.9 |
| 2019 | -8.7°C | -13.4°C | -18.1°C | 0.9°C | -29.2°C | 13 mm | 92% | 3.1 m/s | 1.2 |
| 2018 | -6.5°C | -10.7°C | -14.8°C | 2.1°C | -34.4°C | 20 mm | 93% | 3.1 m/s | 1.1 |
| 2017 | -10.3°C | -14.6°C | -18.8°C | 2.3°C | -37.7°C | 15 mm | 89% | 3.3 m/s | 1 |
| 2016 | -9.9°C | -14.3°C | -18.8°C | 1.2°C | -34.1°C | 36 mm | 93% | 3.5 m/s | 1 |
| 2015 | -4.6°C | -8.0°C | -11.5°C | 4.7°C | -27.2°C | 24 mm | 92% | 2.8 m/s | 1 |
| 2014 | -7.3°C | -11.4°C | -15.4°C | 0.9°C | -35.5°C | 8 mm | 92% | 3.4 m/s | 0.9 |
| 2013 | -16.0°C | -21.1°C | -26.2°C | -3.4°C | -41.3°C | 20 mm | 91% | 3.1 m/s | 1.1 |
| 2012 | -10.6°C | -15.0°C | -19.4°C | 1.4°C | -29.5°C | 16 mm | 91% | 2.8 m/s | 1 |
| 2011 | -4.2°C | -8.3°C | -12.3°C | 4.7°C | -21.7°C | 8 mm | 85% | 3.5 m/s | 0.9 |
| 2010 | -11.3°C | -15.4°C | -19.4°C | -3.8°C | -32.7°C | 14 mm | 94% | 3.1 m/s | 1.1 |
| 2009 | -10.1°C | -13.2°C | -16.3°C | -0.7°C | -26.6°C | 21 mm | 85% | 3.1 m/s | 0.9 |
| 2008 | -15.7°C | -20.9°C | -26.2°C | -1.5°C | -35.9°C | 30 mm | 95% | 3.2 m/s | 1.2 |
| 2007 | -9.3°C | -13.8°C | -18.4°C | -2.5°C | -30.4°C | 24 mm | 94% | 3 m/s | 1 |
| 2006 | -5.1°C | -9.6°C | -14.0°C | 1.6°C | -26.0°C | 27 mm | 93% | 3 m/s | 0.9 |
| 2005 | -6.2°C | -9.9°C | -13.5°C | 0.9°C | -24.5°C | 28 mm | 93% | 2.9 m/s | 1 |
| 2004 🌧️ | -9.1°C | -14.5°C | -19.8°C | 2.3°C | -37.9°C | 42 mm | 88% | 3.7 m/s | 0.9 |
| 2003 | -4.9°C | -8.8°C | -12.8°C | 1.9°C | -22.9°C | 33 mm | 92% | 3.4 m/s | 0.9 |
| 2002 | -5.5°C | -9.2°C | -12.9°C | 2.4°C | -23.6°C | 16 mm | 89% | 3.4 m/s | 1 |
| 2001 | -6.0°C | -10.6°C | -15.1°C | 2.2°C | -25.3°C | 21 mm | 93% | 3.2 m/s | 0.9 |
| 2000 ❄️ | -17.4°C | -22.6°C | -27.7°C | -1.7°C | -37.0°C | 24 mm | 95% | 2.9 m/s | 1.1 |
| 1999 | -4.0°C | -8.6°C | -13.3°C | 4.9°C | -26.2°C | 22 mm | 87% | 3.5 m/s | 0.9 |
| 1998 | -7.9°C | -12.0°C | -16.0°C | 6.2°C | -32.9°C | 21 mm | 87% | 3.3 m/s | 0.9 |
| 1997 | -3.1°C | -6.8°C | -10.5°C | 2.3°C | -25.2°C | 9 mm | 91% | 3 m/s | 0.9 |
| 1996 | -14.6°C | -18.9°C | -23.1°C | -1.8°C | -39.1°C | 40 mm | 97% | 3 m/s | 1.1 |
| 1995 | -14.0°C | -18.3°C | -22.6°C | -1.5°C | -36.4°C | 23 mm | 97% | 2.9 m/s | 1 |
| 1994 | -5.7°C | -9.3°C | -12.9°C | 4.6°C | -23.0°C | 16 mm | 93% | 3.2 m/s | 0.8 |
| 1993 | -8.8°C | -12.9°C | -17.0°C | -0.3°C | -34.1°C | 10 mm | 91% | 3.3 m/s | 1 |
| 1992 | -12.4°C | -16.9°C | -21.3°C | -0.9°C | -34.8°C | 28 mm | 96% | 3.2 m/s | 1 |
| 1991 | -7.8°C | -12.7°C | -17.6°C | 0.4°C | -33.8°C | 31 mm | 96% | 3.5 m/s | 1 |
| 1990 | -11.0°C | -15.8°C | -20.5°C | 3.2°C | -41.0°C | 22 mm | 87% | 3.7 m/s | 0.8 |
| 1989 | -15.0°C | -19.8°C | -24.7°C | 1.5°C | -39.1°C | 17 mm | 88% | 3.5 m/s | 1 |
| 1988 | -9.9°C | -14.9°C | -19.9°C | 0.6°C | -32.3°C | 27 mm | 95% | 3.2 m/s | 1 |
| 1987 | -5.3°C | -8.9°C | -12.6°C | 1.6°C | -26.4°C | 14 mm | 90% | 3.1 m/s | 0.9 |
| 1986 | -8.4°C | -12.8°C | -17.2°C | -1.5°C | -31.0°C | 10 mm | 98% | 3.4 m/s | 1 |
| 1985 | -14.7°C | -19.3°C | -23.9°C | 0.4°C | -31.7°C | 17 mm | 97% | 3.3 m/s | 0.9 |
| 1984 | -13.6°C | -19.2°C | -24.8°C | 2.0°C | -38.9°C | 27 mm | 92% | 3.5 m/s | 1 |
| 1983 | -16.9°C | -21.4°C | -25.9°C | -7.1°C | -37.0°C | 8 mm | 91% | 3.1 m/s | — |
| 1982 | -8.0°C | -11.8°C | -15.6°C | 4.7°C | -27.9°C | 23 mm | 88% | 3.5 m/s | — |
| 1981 | -9.1°C | -12.8°C | -16.5°C | 0.8°C | -31.4°C | 11 mm | 89% | 2.8 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -9.1°C with lows near -17.8°C (mean -13.4°C), based on 45 years of NASA POWER data.
December averages 21 mm of rainfall in Hanover, one of the drier months. The wettest on record was 42 mm in 2004.
The hottest December reached 6.2°C in 1998. The coldest dipped to -41.3°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 5°C. Daytime highs moved from -12.5°C to -7.7°C and overnight lows from -21.3°C to -16.2°C over the same span.
December is one of the cooler months of the year in Hanover and one of the drier months, so plan for around -9.1°C daytime highs and -17.8°C at night.
Not quite — December is the 3rd coolest month in Hanover, averaging -13.4°C.
For December in Hanover, pack warm layers and a jacket for chilly mornings, with typical highs of -9.1°C and lows of -17.8°C.
Relative humidity in December averages 92% — quite humid.
Average wind speed in December is 3.2 m/s. The windiest December on record averaged 3.7 m/s (1990).
The wettest December on record was 2004 with 42 mm. On average, December sees 21 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 Hanover 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.
