Climate averages 1991–2020
Lethbridge weather
in May.
A mild, moderately wet month: the 5th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Lethbridge: daytime highs average 17.1°C and nights cool to about 5.4°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 59 mm of rain on roughly 9 days, which makes May a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 21 min on an average May day.
The nearest other city in this atlas is Calgary (175 km away). In May its highs average 15.7°C, 1.5°C cooler than Lethbridge, with 72 mm of rain.
Among the 86 cities listed in Canada, Lethbridge ranks joint 45th of 86 for the warmest May highs and 9th of 86 for the driest May (rainfall, lowest first). The mean May high of those 86 cities is 17.0°C; Lethbridge is 0.2°C warmer than that mean.
From May to June, average highs rise by 3.7°C to 20.9°C, and monthly rainfall rises from 59 mm to 92 mm.
The annual picture
May in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Lethbridge climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.9°C-9.7°C | -9.7°C | 14 | 4.4 | 8.69 h |
| February | 1.5°C-8.2°C | -8.2°C | 13 | 4.0 | 10.110 h |
| March | 6.1°C-4.9°C | -4.9°C | 22 | 6.0 | 11.912 h |
| April | 11.6°C0.2°C | 0.2°C | 40 | 7.9 | 13.714 h |
| May, selected | 17.1°C5.4°C | 5.4°C | 59 | 9.1 | 15.315 h |
| June | 20.9°C9.9°C | 9.9°C | 92 | 10.9 | 16.216 h |
| July | 25.6°C13.3°C | 13.3°C | 35 | 6.8 | 15.916 h |
| August | 25.2°C12.8°C | 12.8°C | 35 | 5.8 | 14.414 h |
| September | 19.7°C8.3°C | 8.3°C | 37 | 5.8 | 12.713 h |
| October | 11.9°C2.1°C | 2.1°C | 28 | 5.8 | 10.811 h |
| November | 4.1°C-3.8°C | -3.8°C | 22 | 5.3 | 9.19 h |
| December | -0.6°C-8.4°C | -8.4°C | 16 | 4.4 | 8.28 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Calgary in MayCanada · 175 kmHigh 15.7°C · Low 3.0°C · 72 mm rain
- Airdrie in MayCanada · 198 kmHigh 15.0°C · Low 3.2°C · 75 mm rain
- Red Deer in MayCanada · 294 kmHigh 15.5°C · Low 4.1°C · 63 mm rain
- Missoula in MayUnited States · 326 kmHigh 17.9°C · Low 6.3°C · 56 mm rain
- Spokane Valley in MayUnited States · 395 kmHigh 19.2°C · Low 7.0°C · 51 mm rain
- Spokane in MayUnited States · 407 kmHigh 19.9°C · Low 7.8°C · 46 mm rain
- Sherwood Park in MayCanada · 426 kmHigh 15.5°C · Low 4.7°C · 53 mm rain
- Edmonton in MayCanada · 430 kmHigh 16.2°C · Low 5.2°C · 53 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Lethbridge) is explained once on the Lethbridge year overview and on the Sources, method and limits page.