May is one of the warmer months of the year in Hanover, with average highs near 19.1°C and lows around 5.8°C (mean 12.5°C). It is a relatively wet time of year, averaging 73 mm of rainfall and 65% relative humidity across the period.
May is one of the warmer months of the year in Hanover. Across 45 years of records, the warmest May in Hanover was 2023 — when the month averaged 16.6°C — while the coldest was 2004 at 8.2°C. Typical May days reach 19.1°C with nights near 5.8°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Hanover, averaging 73 mm of rainfall. The wettest May on record was 2004 with 196 mm, while the driest was 2020 at 21 mm.
Relative humidity in Hanover during May averages 65%. The most humid May was 2022 at 74%, and the least humid was 2025 at 56%.
May receives about 5.6 kWh/m²/day of solar energy in Hanover. The sunniest May was 2025 at 6.5 kWh/m²/day, and the cloudiest was 2022 at 4.8.
Average wind speed in Hanover during May is 3.2 m/s. The windiest May was 1999 at 3.9 m/s, while the calmest were 1981 and 1995 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.1°C | 12.3°C | 11.3°C | 12.6°C | 13.3°C | +0.2°C |
| Avg High | 20.1°C | 19.1°C | 17.7°C | 19.0°C | 20.0°C | -0.1°C |
| Avg Low | 6.2°C | 5.4°C | 4.9°C | 6.2°C | 6.6°C | +0.4°C |
| Avg Rain | 58 mm | 68 mm | 87 mm | 83 mm | 65 mm | +7 mm |
May temperatures in Hanover have risen by about 1.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -6.2°C (2004) to a record high of 35.3°C (2025).
Rainfall in May is a relatively wet time of year, averaging 73 mm, with a wettest year of 196 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
A good time to visit Hanover
May is a good time to visit Hanover, with days averaging 19.1°C and nights around 5.8°C (mean 12.5°C, warmer than Hanover's yearly average) and moderate rainfall. July and August are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.3°C | 15.5°C | 7.7°C | 35.3°C | -1.6°C | 31 mm | 56% | 3.3 m/s | 6.5 |
| 2024 | 18.0°C | 12.2°C | 6.5°C | 26.7°C | 2.0°C | 114 mm | 71% | 3.1 m/s | 4.9 |
| 2023 🔥 | 23.6°C | 16.6°C | 9.6°C | 31.7°C | -0.3°C | 21 mm | 63% | 3.2 m/s | 5.9 |
| 2022 | 17.4°C | 11.4°C | 5.5°C | 24.8°C | -3.2°C | 164 mm | 74% | 3.5 m/s | 4.8 |
| 2021 | 19.8°C | 12.4°C | 5.0°C | 30.9°C | -2.2°C | 42 mm | 59% | 3.3 m/s | 6 |
| 2020 | 17.8°C | 11.6°C | 5.3°C | 27.0°C | -4.6°C | 21 mm | 64% | 3.3 m/s | 6.2 |
| 2019 | 17.3°C | 10.7°C | 4.2°C | 29.4°C | -3.2°C | 38 mm | 60% | 3 m/s | 6.1 |
| 2018 | 23.6°C | 16.0°C | 8.3°C | 31.1°C | -2.5°C | 48 mm | 60% | 2.9 m/s | 6.2 |
| 2017 | 18.7°C | 12.2°C | 5.8°C | 23.9°C | 0.4°C | 24 mm | 64% | 3.3 m/s | 5.8 |
| 2016 | 20.8°C | 14.2°C | 7.6°C | 33.1°C | -3.6°C | 69 mm | 62% | 3.1 m/s | 5.7 |
| 2015 | 18.4°C | 11.6°C | 4.9°C | 28.6°C | -2.1°C | 88 mm | 66% | 3.2 m/s | 5.6 |
| 2014 | 17.7°C | 11.8°C | 6.0°C | 30.2°C | -3.4°C | 83 mm | 71% | 2.9 m/s | 5.1 |
| 2013 | 18.0°C | 11.5°C | 5.1°C | 25.8°C | -5.8°C | 132 mm | 68% | 3.5 m/s | 5.3 |
| 2012 | 19.8°C | 13.5°C | 7.3°C | 29.4°C | 3.3°C | 85 mm | 65% | 3.3 m/s | 5.5 |
| 2011 | 16.9°C | 11.2°C | 5.5°C | 25.3°C | -5.0°C | 92 mm | 72% | 3.3 m/s | 5.1 |
| 2010 | 18.6°C | 12.9°C | 7.2°C | 27.7°C | -2.0°C | 171 mm | 69% | 3.1 m/s | 5.1 |
| 2009 | 15.3°C | 8.9°C | 2.5°C | 22.1°C | -3.3°C | 85 mm | 69% | 3.5 m/s | 5.6 |
| 2008 | 16.6°C | 9.9°C | 3.2°C | 24.2°C | -3.6°C | 49 mm | 63% | 3.1 m/s | 6.2 |
| 2007 | 19.9°C | 13.4°C | 6.8°C | 29.3°C | 0.5°C | 111 mm | 69% | 3.8 m/s | 5 |
| 2006 | 19.4°C | 13.3°C | 7.2°C | 30.5°C | -1.6°C | 61 mm | 69% | 3.1 m/s | 5.3 |
| 2005 | 17.1°C | 11.4°C | 5.7°C | 27.4°C | -3.9°C | 77 mm | 70% | 3.4 m/s | 4.9 |
| 2004 ❄️ 🌧️ | 14.0°C | 8.2°C | 2.4°C | 23.5°C | -6.2°C | 196 mm | 70% | 3.4 m/s | 4.9 |
| 2003 | 20.6°C | 13.6°C | 6.6°C | 26.7°C | -1.1°C | 88 mm | 60% | 3.2 m/s | 5.7 |
| 2002 | 15.6°C | 8.8°C | 2.0°C | 28.9°C | -4.2°C | 55 mm | 61% | 3.5 m/s | 6.1 |
| 2001 | 19.0°C | 13.0°C | 7.0°C | 25.4°C | 1.3°C | 104 mm | 71% | 3.5 m/s | 5.4 |
| 2000 | 19.2°C | 12.4°C | 5.6°C | 29.7°C | -1.5°C | 47 mm | 63% | 3 m/s | 5.4 |
| 1999 | 18.2°C | 12.4°C | 6.6°C | 28.1°C | -0.5°C | 136 mm | 69% | 3.9 m/s | 5 |
| 1998 | 21.4°C | 14.5°C | 7.7°C | 27.0°C | 1.6°C | 98 mm | 64% | 3 m/s | 6.1 |
| 1997 | 16.2°C | 9.4°C | 2.5°C | 27.5°C | -3.5°C | 43 mm | 65% | 3.2 m/s | 6 |
| 1996 | 17.1°C | 10.4°C | 3.8°C | 24.8°C | -4.3°C | 90 mm | 66% | 2.8 m/s | 5.7 |
| 1995 | 17.9°C | 11.1°C | 4.4°C | 30.5°C | -1.4°C | 48 mm | 67% | 2.7 m/s | 5.6 |
| 1994 | 20.7°C | 13.4°C | 6.2°C | 30.4°C | -2.1°C | 47 mm | 62% | 3.4 m/s | 6.1 |
| 1993 | 19.3°C | 12.3°C | 5.2°C | 28.7°C | -0.7°C | 42 mm | 61% | 3.1 m/s | 5.5 |
| 1992 | 19.8°C | 12.6°C | 5.3°C | 30.0°C | -2.9°C | 58 mm | 66% | 3.4 m/s | 5.8 |
| 1991 | 21.5°C | 15.1°C | 8.7°C | 30.7°C | -3.1°C | 80 mm | 66% | 3.1 m/s | 5.3 |
| 1990 | 18.5°C | 11.3°C | 4.0°C | 27.5°C | -6.0°C | 34 mm | 61% | 2.9 m/s | 6.2 |
| 1989 | 21.2°C | 13.7°C | 6.2°C | 30.3°C | -5.7°C | 56 mm | 59% | 3.2 m/s | 6 |
| 1988 | 22.7°C | 15.5°C | 8.4°C | 30.9°C | -1.2°C | 66 mm | 60% | 3.6 m/s | 5.7 |
| 1987 | 22.6°C | 15.3°C | 8.0°C | 33.2°C | -0.1°C | 61 mm | 61% | 3.4 m/s | 5.9 |
| 1986 | 20.7°C | 13.8°C | 6.8°C | 31.8°C | -5.2°C | 51 mm | 68% | 3.1 m/s | 6 |
| 1985 | 21.1°C | 14.2°C | 7.4°C | 29.7°C | 1.9°C | 104 mm | 65% | 3.2 m/s | 5.6 |
| 1984 | 17.6°C | 10.6°C | 3.6°C | 31.4°C | -3.6°C | 33 mm | 62% | 3.4 m/s | 5.9 |
| 1983 | 16.2°C | 9.3°C | 2.4°C | 22.6°C | -5.5°C | 47 mm | 63% | 3.6 m/s | — |
| 1982 | 19.6°C | 13.5°C | 7.4°C | 28.6°C | -3.2°C | 51 mm | 70% | 3.2 m/s | — |
| 1981 | 19.6°C | 12.4°C | 5.2°C | 28.3°C | -5.3°C | 57 mm | 60% | 2.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 19.1°C with lows near 5.8°C (mean 12.5°C), based on 45 years of NASA POWER data.
May averages 73 mm of rainfall in Hanover, a relatively wet time of year. The wettest on record was 196 mm in 2004.
The hottest May reached 35.3°C in 2025. The coldest dipped to -6.2°C in 2004.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.6°C. Daytime highs moved from 18.8°C to 20.4°C and overnight lows from 5.2°C to 6.9°C over the same span.
May is one of the warmer months of the year in Hanover and a relatively wet time of year, so plan for around 19.1°C daytime highs and 5.8°C at night.
Not quite — May is the 8th coolest month in Hanover, averaging 12.5°C.
For May in Hanover, pack warm layers and a jacket for chilly mornings, with typical highs of 19.1°C and lows of 5.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 65% — moderately humid.
Average wind speed in May is 3.2 m/s. The windiest May on record averaged 3.9 m/s (1999).
The wettest May on record was 2004 with 196 mm. On average, May sees 73 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 May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
