Lethbridge climate
Lethbridge (Alberta, Canada) has a warm-summer humid continental climate (Köppen Dfb). The average temperature over the year is 7 °C44 °F, and about 492 mm19 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Lethbridge climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −130 | −915 | −523 | 271.1 | 30 |
| Feb | 032 | −1015 | −523 | 251.0 | 28 |
| Mar | 642 | −523 | 033 | 291.1 | 28 |
| Apr | 1253 | 031 | 642 | 451.8 | 19 |
| May | 1864 | 542 | 1253 | 642.5 | 4 |
| Jun | 2272 | 1050 | 1661 | 903.5 | 0 |
| Jul | 2882 | 1457 | 2169 | 331.3 | 0 |
| Aug | 2780 | 1254 | 1967 | 391.5 | 0 |
| Sep | 2069 | 745 | 1457 | 441.7 | 1 |
| Oct | 1253 | 134 | 644 | 351.4 | 13 |
| Nov | 439 | −425 | 032 | 341.3 | 24 |
| Dec | −129 | −916 | −523 | 271.1 | 30 |
| Year | 2882 | −1015 | 744 | 49219 | 178 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 84% | 71% | 1.3 | 8:34 |
| Feb | 81% | 69% | 2.5 | 10:02 |
| Mar | 73% | 69% | 3.6 | 11:44 |
| Apr | 65% | 68% | 4.8 | 13:41 |
| May | 61% | 65% | 5.8 | 15:21 |
| Jun | 62% | 60% | 6.5 | 16:17 |
| Jul | 53% | 42% | 7.1 | 15:54 |
| Aug | 53% | 51% | 5.6 | 14:26 |
| Sep | 59% | 56% | 4.0 | 12:31 |
| Oct | 68% | 65% | 2.5 | 10:39 |
| Nov | 76% | 69% | 1.4 | 8:59 |
| Dec | 83% | 69% | 1.0 | 8:08 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Lethbridge is like
The warmest month is July, with an average high of 28 °C82 °F and a low of 14 °C57 °F. The coldest is December, when highs average −1 °C29 °F and lows −9 °C16 °F. Seasons are strongly marked: the warmest month is on average 26.1 °C46.9 °F warmer than the coldest.
Annual precipitation is moderate at about 492 mm19 in. The wettest three-month stretch is April–June, which brings 40% of the annual total. The wettest month is June (90 mm3.5 in), the driest is February (25 mm1.0 in).
Relative humidity ranges from 53% in August to 84% in January. The clearest skies (lowest average cloud amount, 42%) are typical of July. Average wind speed near the ground ranges from 7 km/h (4 mph) in August to 13 km/h (8 mph) in January. Daylight lasts from about 8.1 hours in December to 16.3 hours in June.
A lasting snow cover is typical in November–March, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 17 cm).
Best time to visit Lethbridge
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–September: average highs of 20 °C69 °F to 28 °C82 °F with 33 mm1.3 in to 90 mm3.5 in of precipitation per month.
The most challenging month is December, which is cold, with average highs of −1 °C29 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Lethbridge
- Winter (December–February) — highs −129 to 0 °C32 °F, lows −1015 to −9 °C16 °F, about 26 mm1.0 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 642 to 18 °C64 °F, lows −523 to 5 °C42 °F, about 46 mm1.8 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 2272 to 28 °C82 °F, lows 1050 to 14 °C57 °F, about 54 mm2.1 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 439 to 20 °C69 °F, lows −425 to 7 °C45 °F, about 38 mm1.5 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
How Lethbridge compares
Compared with Calgary, about 175 km to the northwest, Lethbridge is on average 1.5 °C2.6 °F warmer and receives 10% less precipitation (492 mm19 in vs 546 mm21 in). The difference is largest in July (2.5 °C4.4 °F warmer).
Of the 40 places in Canada covered by World Climates, Lethbridge is the 25th warmest by annual mean temperature and the 36th wettest by annual precipitation. See all of them on the Canada climate page.
Places in other countries with the most similar temperature and rainfall pattern: Baranovichi (Belarus, Dfb), Zhytomyr (Ukraine, Dfb) and Gyumri (Armenia, Dfb).
Nearby places
- Calgary 175 km · 5 °C41 °F · 546 mm21 in
- Red Deer 294 km · 4 °C39 °F · 531 mm21 in
- Spokane 407 km · 9 °C49 °F · 552 mm22 in
- Edmonton 430 km · 4 °C39 °F · 520 mm20 in
- Kelowna 479 km · 9 °C49 °F · 451 mm18 in
- Saskatoon 509 km · 4 °C39 °F · 455 mm18 in
- Billings 542 km · 10 °C50 °F · 428 mm17 in
- Kamloops 545 km · 9 °C48 °F · 446 mm18 in
Frequently asked questions
What is the warmest month in Lethbridge?
July is the warmest month in Lethbridge, with an average high of 28 °C (82 °F) and an average low of 14 °C (57 °F).
What is the coldest month in Lethbridge?
December is the coldest month, with an average high of -1 °C (29 °F) and an average low of -9 °C (16 °F).
When does it rain the most in Lethbridge?
June is the wettest month with about 90 mm (3.5 in) of precipitation; February is the driest with about 25 mm (1.0 in).
What is the best time to visit Lethbridge?
Judging by long-term averages, the most comfortable months are June–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 1,054 m, while Lethbridge lies at about 907 m. Temperatures on this page were therefore adjusted by +1 °C1.7 °F using the standard lapse rate of 6.5 °C per 1,000 m.