Alberta climate

World Climates covers 4 places in Alberta. By annual mean temperature, the warmest is Lethbridge (7 °C44 °F) and the coolest is Edmonton (4 °C39 °F). The wettest is Calgary with 546 mm21 in of precipitation per year, the driest Lethbridge with 492 mm19 in.

The most common climate types (Köppen classification computed from these averages) are warm-summer humid continental (Dfb, 4 places).

The highest monthly average high is in Lethbridge (28 °C82 °F in July); the lowest monthly average low is in Edmonton (−14 °C7 °F in January).

Across the places in Alberta, the months that most often rank as the most comfortable are July, August and September (4, 4 and 2 of 4 places respectively).

Temperature and rainfall across Alberta

Annual mean temperatures in Alberta range from 4 °C39 °F to 7 °C44 °F. The typical place (the median of all 4) has a year average of 5 °C40 °F. Annual precipitation ranges from 492 mm19 in to 546 mm21 in. The median place receives about 525 mm21 in in an average year.

In 4 places of 4, the coldest month has an average low below 0 °C (32 °F). In 0 places, the warmest month has an average high above 30 °C (86 °F). No place here gets less than 250 mm (10 in) of precipitation a year. None gets more than 2,000 mm (79 in) a year.

Averaged over all 4 places, July is the warmest month, with a mean of 19 °C66 °F. January is the coldest, with −7 °C19 °F. The wettest month on average is June (97 mm3.8 in). The driest is February (20 mm0.8 in). Single places can differ a lot from this average, so check the page of each city.

The table below lists the places sorted by population. The largest ones covered here are Calgary, Edmonton and Lethbridge. Each city page has a chart and a table for every month. It also shows the best time to visit and what to pack. The figures are 25-year averages for 2001–2025 from NASA POWER. They describe grid cells of roughly 50–70 km, not single weather stations.

Climate of each place in Alberta

Calgary has a warm-summer humid continental climate (Köppen Dfb). Its year average is 5 °C41 °F. The warmest month is July, with an average high of 25 °C77 °F. The coldest is December, with an average low of −10 °C13 °F. About 546 mm21 in of precipitation falls in a year. June is the wettest month and January the driest. By our comfort score, the best months to visit are July–September.

Edmonton has a warm-summer humid continental climate (Köppen Dfb). Its year average is 4 °C39 °F. The warmest month is July, with an average high of 24 °C75 °F. The coldest is January, with an average low of −14 °C7 °F. About 520 mm20 in of precipitation falls in a year. July is the wettest month and February the driest. By our comfort score, the best months to visit are June–August.

Lethbridge has a warm-summer humid continental climate (Köppen Dfb). Its year average is 7 °C44 °F. The warmest month is July, with an average high of 28 °C82 °F. The coldest is December, with an average low of −9 °C16 °F. About 492 mm19 in of precipitation falls in a year. June is the wettest month and February the driest. By our comfort score, the best months to visit are June–September.

Red Deer has a warm-summer humid continental climate (Köppen Dfb). Its year average is 4 °C39 °F. The warmest month is July, with an average high of 24 °C74 °F. The coldest is January, with an average low of −13 °C9 °F. About 531 mm21 in of precipitation falls in a year. June is the wettest month and December the driest. By our comfort score, the best months to visit are July and August.

Frequently asked questions

Which is the warmest place in Alberta?

By annual mean temperature, the warmest place in Alberta is Lethbridge at 7 °C44 °F. The coolest is Edmonton at 4 °C39 °F.

Where does it rain the most in Alberta?

Calgary gets the most precipitation, 546 mm21 in in an average year. The driest place is Lethbridge with 492 mm19 in.

How many places in Alberta does this site cover?

World Climates has climate data for 4 places in Alberta. Each one has a page with monthly averages for temperature, rainfall, humidity and daylight.

When is the best time to visit Alberta?

It depends on the place. Across Alberta, the months that most often rank as the most comfortable are July, August and September. Check the page of each city for its own best months.