May is one of the warmer months of the year in L’Assomption, with average highs near 18°C and lows around 6.6°C (mean 12.3°C). It is about average for rainfall, averaging 84 mm of rainfall and 78% relative humidity across the period.
May is one of the warmer months of the year in L’Assomption. Across 45 years of records, the warmest May in L’Assomption was 1998 — when the month averaged 15.4°C — while the coldest was 1997 at 9.3°C. Typical May days reach 18°C with nights near 6.6°C. The long-term trend is warming, about 0.3°C per decade.
May is about average for rainfall in L’Assomption, averaging 84 mm of rainfall. The wettest May on record was 1983 with 185 mm, while the driest was 2021 at 23 mm.
Relative humidity in L’Assomption during May averages 78%. The most humid May was 2011 at 85%, and the least humid was 2023 at 71%.
May receives about 5.3 kWh/m²/day of solar energy in L’Assomption. The sunniest May was 2023 at 6.3 kWh/m²/day, and the cloudiest was 1984 at 4.
Average wind speed in L’Assomption during May is 2.5 m/s. The windiest May was 1997 at 3 m/s, while the calmest were 1982, 2003 and 2012 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.0°C | 12.1°C | 11.6°C | 12.9°C | 13.2°C | +1.2°C |
| Avg High | 17.5°C | 17.9°C | 17.2°C | 18.5°C | 19.1°C | +1.6°C |
| Avg Low | 6.4°C | 6.3°C | 6.1°C | 7.3°C | 7.3°C | +0.9°C |
| Avg Rain | 95 mm | 71 mm | 98 mm | 93 mm | 49 mm | -46 mm |
May temperatures in L’Assomption have risen by about 2.2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -3.9°C (1995) to a record high of 30.9°C (2010).
Rainfall in May is about average for rainfall, averaging 84 mm, with a wettest year of 185 mm.
A good time to visit L’Assomption
May is a good time to visit L’Assomption, with days averaging 18°C and nights around 6.6°C (mean 12.3°C, warmer than L’Assomption's yearly average) and higher 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 | 18.9°C | 13.4°C | 8.0°C | 26.3°C | -0.6°C | 77 mm | 76% | 2.4 m/s | 4.5 |
| 2024 | 20.3°C | 15.1°C | 9.9°C | 27.8°C | 2.5°C | 51 mm | 77% | 2.3 m/s | 5.2 |
| 2023 | 18.7°C | 12.2°C | 5.7°C | 28.1°C | -2.2°C | 47 mm | 71% | 2.7 m/s | 6.3 |
| 2022 | 20.7°C | 14.4°C | 8.0°C | 28.5°C | -1.3°C | 66 mm | 75% | 2.3 m/s | 5.9 |
| 2021 | 18.9°C | 13.0°C | 7.1°C | 29.3°C | -0.9°C | 23 mm | 72% | 2.3 m/s | 5.7 |
| 2020 | 17.0°C | 11.1°C | 5.2°C | 30.5°C | -3.9°C | 32 mm | 75% | 2.6 m/s | 6.2 |
| 2019 | 15.8°C | 10.5°C | 5.2°C | 23.0°C | -2.2°C | 109 mm | 80% | 2.3 m/s | 4.7 |
| 2018 | 19.4°C | 12.9°C | 6.4°C | 27.4°C | 0.1°C | 50 mm | 78% | 2.5 m/s | 5.9 |
| 2017 | 16.5°C | 11.8°C | 7.1°C | 27.7°C | 0.5°C | 139 mm | 83% | 2.7 m/s | 4.5 |
| 2016 | 18.3°C | 12.5°C | 6.6°C | 27.0°C | -1.1°C | 77 mm | 79% | 2.2 m/s | 5.5 |
| 2015 | 20.7°C | 14.4°C | 8.0°C | 27.0°C | -0.6°C | 92 mm | 77% | 2.6 m/s | 5.7 |
| 2014 | 18.1°C | 12.6°C | 7.2°C | 26.3°C | -0.6°C | 93 mm | 81% | 2.4 m/s | 5.2 |
| 2013 | 19.5°C | 13.8°C | 8.1°C | 27.0°C | -0.8°C | 103 mm | 77% | 2.4 m/s | 5.4 |
| 2012 | 19.8°C | 14.2°C | 8.7°C | 28.0°C | 1.9°C | 98 mm | 79% | 2.1 m/s | 5.4 |
| 2011 | 17.3°C | 12.5°C | 7.7°C | 24.6°C | 2.0°C | 133 mm | 85% | 2.6 m/s | 4.6 |
| 2010 | 20.0°C | 13.9°C | 7.8°C | 30.9°C | -1.1°C | 36 mm | 76% | 2.3 m/s | 5.9 |
| 2009 | 16.6°C | 11.1°C | 5.6°C | 25.4°C | 0.2°C | 105 mm | 78% | 2.7 m/s | 5 |
| 2008 | 16.3°C | 10.8°C | 5.2°C | 22.6°C | -1.7°C | 65 mm | 77% | 2.4 m/s | 5.6 |
| 2007 | 18.1°C | 11.9°C | 5.6°C | 27.8°C | -0.6°C | 61 mm | 77% | 2.4 m/s | 5.8 |
| 2006 | 18.2°C | 13.3°C | 8.5°C | 27.8°C | -1.3°C | 149 mm | 84% | 2.4 m/s | 4.6 |
| 2005 | 15.1°C | 10.1°C | 5.1°C | 24.1°C | -2.7°C | 52 mm | 80% | 2.4 m/s | 5 |
| 2004 | 17.8°C | 12.0°C | 6.2°C | 24.8°C | -3.0°C | 95 mm | 80% | 2.6 m/s | 5 |
| 2003 | 17.4°C | 11.8°C | 6.1°C | 25.2°C | -1.9°C | 108 mm | 78% | 2.1 m/s | 5.1 |
| 2002 | 15.5°C | 10.0°C | 4.5°C | 24.6°C | -1.5°C | 139 mm | 77% | 2.9 m/s | 4.8 |
| 2001 | 19.6°C | 13.7°C | 7.9°C | 26.8°C | 2.0°C | 64 mm | 78% | 2.3 m/s | 5.3 |
| 2000 | 16.9°C | 11.3°C | 5.8°C | 25.1°C | -1.3°C | 138 mm | 81% | 2.5 m/s | 4.8 |
| 1999 | 21.1°C | 14.9°C | 8.8°C | 29.2°C | 0.0°C | 58 mm | 74% | 2.3 m/s | 5.9 |
| 1998 🔥 | 21.3°C | 15.4°C | 9.4°C | 26.9°C | 4.4°C | 70 mm | 75% | 2.4 m/s | 5.7 |
| 1997 ❄️ | 14.8°C | 9.3°C | 3.9°C | 22.2°C | -2.4°C | 65 mm | 76% | 3 m/s | 4.6 |
| 1996 | 16.8°C | 10.9°C | 4.9°C | 26.5°C | 0.0°C | 52 mm | 73% | 2.4 m/s | 5.8 |
| 1995 | 18.1°C | 12.0°C | 5.9°C | 26.1°C | -3.9°C | 69 mm | 74% | 2.4 m/s | 5.1 |
| 1994 | 16.9°C | 10.9°C | 4.8°C | 26.9°C | -3.0°C | 92 mm | 77% | 2.7 m/s | 5.2 |
| 1993 | 17.7°C | 12.3°C | 6.9°C | 23.8°C | 2.2°C | 69 mm | 78% | 2.5 m/s | 4.7 |
| 1992 | 17.7°C | 11.4°C | 5.0°C | 26.7°C | -2.2°C | 53 mm | 76% | 2.4 m/s | 6.1 |
| 1991 | 19.2°C | 13.6°C | 8.0°C | 26.3°C | 1.7°C | 96 mm | 79% | 2.5 m/s | 5.3 |
| 1990 | 15.8°C | 10.6°C | 5.3°C | 22.9°C | -0.1°C | 83 mm | 77% | 2.5 m/s | 4.9 |
| 1989 | 18.1°C | 13.1°C | 8.0°C | 28.2°C | 1.5°C | 105 mm | 82% | 2.3 m/s | 4.5 |
| 1988 | 18.8°C | 13.1°C | 7.3°C | 24.0°C | 0.7°C | 54 mm | 78% | 2.4 m/s | 5.1 |
| 1987 | 17.6°C | 11.6°C | 5.7°C | 28.4°C | -3.3°C | 87 mm | 76% | 2.6 m/s | 5.4 |
| 1986 | 18.4°C | 13.0°C | 7.6°C | 27.1°C | -3.2°C | 124 mm | 80% | 2.5 m/s | 5.1 |
| 1985 | 16.9°C | 11.1°C | 5.3°C | 25.2°C | -1.7°C | 53 mm | 76% | 2.5 m/s | 5.6 |
| 1984 | 15.0°C | 10.3°C | 5.5°C | 23.4°C | -1.0°C | 111 mm | 80% | 2.8 m/s | 4 |
| 1983 🌧️ | 15.3°C | 10.1°C | 5.0°C | 21.0°C | -1.8°C | 185 mm | 84% | 2.3 m/s | — |
| 1982 | 19.1°C | 13.1°C | 7.0°C | 26.4°C | 1.5°C | 30 mm | 79% | 2.1 m/s | — |
| 1981 | 18.0°C | 12.2°C | 6.3°C | 23.5°C | -2.3°C | 106 mm | 79% | 2.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18°C with lows near 6.6°C (mean 12.3°C), based on 45 years of NASA POWER data.
May averages 84 mm of rainfall in L’Assomption, about average for rainfall. The wettest on record was 185 mm in 1983.
The hottest May reached 30.9°C in 2010. The coldest dipped to -3.9°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.2°C. Daytime highs moved from 16.9°C to 19.5°C and overnight lows from 5.8°C to 7.7°C over the same span.
May is one of the warmer months of the year in L’Assomption and about average for rainfall, so plan for around 18°C daytime highs and 6.6°C at night.
Not quite — May is the 8th coolest month in L’Assomption, averaging 12.3°C.
For May in L’Assomption, pack warm layers and a jacket for chilly mornings, with typical highs of 18°C and lows of 6.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 78% — quite humid.
Average wind speed in May is 2.5 m/s. The windiest May on record averaged 3 m/s (1997).
The wettest May on record was 1983 with 185 mm. On average, May sees 84 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 L’Assomption 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.
