Few Canadian towns have colder winter nights than Sioux Lookout
In July the day’s top temperature is typically 24.3°C. Precipitation follows the seasons: June brings about 5.1 times as much as February. Summers stay cool: July afternoons here are cooler than in 68% of Canadian towns. An umbrella or a shovel earns its place on about 112 days a year with 1 mm or more.
Figures: ECCC’s 1991–2020 normals at Sioux Lookout (3.1 km north-east).
A year in Sioux Lookout at a glance
Each month’s typical high and low, in °C.
What stands out about Sioux Lookout’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Sioux Lookout feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 194 days, 20°C on 92
Frost comes from September to May; in January almost every night freezes. On about 56 nights a year the air falls below −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
796 mm of precipitation in a typical year
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 213 cm of snow a year
Expect snow from September to May, with about 41 cm in November, the snowiest month.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Sioux Lookout
90% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Each day the mean sits under 18°C adds its shortfall; a year’s total is its heating degree days. Over a year, a home here needs more heating than 97% of Canadian towns.
Living with Sioux Lookout’s climate
What the normals mean for a garden, a day outside and the depth of winter.
The frost-free stretch runs from about 17 May to about 28 September, some 133 days in a normal year.
Afternoons of 17–27°C and nights of at least 8°C arrive in Jun, Jul and Aug.
Parks & trails →Winter brings about 82 days with a wind chill below −20.
About 20 days a year turn sultry, with the humidex past 30.
For blizzards, floods and wildfire, turn to Sioux Lookout’s hazards page.
Flood & hazards →ECCC’s normals location: Sioux Lookout
Sioux Lookout is a composite: ECCC joins 3 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 3.1 km north-east |
| Station altitude | 383 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −43.9°C |
| Hottest reading, 1991–2020 | 37.8°C |
| Average wind | 11.5 km/h on average, most often from the south |
| Next-nearest location | Atikokan, 146 km |
How Sioux Lookout compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Ontario.
Nearby towns’ climate
Places around Sioux Lookout whose figures come from another normals location. Sioux Lookout has few close neighbours with figures, so the list reaches 78–101 km out.
Sioux Lookout weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −12.0°C | −22.3°C | −17.2°C | 36 mm | 37 cm |
| February | −7.8°C | −19.8°C | −13.9°C | 22 mm | 23 cm |
| March | −0.1°C | −12.5°C | −6.3°C | 33 mm | 24 cm |
| April | 8.3°C | −3.8°C | 2.3°C | 43 mm | 23 cm |
| May | 16.3°C | 3.8°C | 10.1°C | 91 mm | 7 cm |
| June | 22.1°C | 10.3°C | 16.2°C | 113 mm | 0 cm |
| July | 24.3°C | 13.1°C | 18.8°C | 102 mm | 0 cm |
| August | 23.1°C | 12.1°C | 17.7°C | 95 mm | 0 cm |
| September | 17.1°C | 7.2°C | 12.2°C | 96 mm | 1 cm |
| October | 8.1°C | 0.4°C | 4.3°C | 78 mm | 20 cm |
| November | −1.2°C | −8.2°C | −4.7°C | 53 mm | 41 cm |
| December | −8.5°C | −17.0°C | −12.8°C | 37 mm | 38 cm |
| Year | 7.5°C | −3.1°C | 2.2°C | 796 mm | 213 cm |
From −35.3°C to 23.4°C: March’s coldest and warmest days since 1991
The month to count on least is February: one year in three its average strays more than 3.7°C from −13.9°C. August moves least, typically by 1.5°C.
Where Sioux Lookout’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Sioux Lookout, 1991–2020, chosen as the nearest location with a full temperature record.
- Comparisons: every Canadian town and neighbourhood of 2,500 or more, each read from its own nearest location; city totals and reserves are left out.
- Not on this page: sunshine, which none of ECCC’s 450 locations publishes for 1991–2020, and the town’s own height above sea level, so no figure is adjusted for altitude.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Sioux Lookout’s climate
How warm does Sioux Lookout get in summer?
In July, the warmest month, the typical high is 24.3°C.
How cold does Sioux Lookout get in winter?
On a normal January night the air drops to −22.3°C, the coldest of the year.
How much rain and snow does Sioux Lookout get?
Around 796 mm a year in all, from 113 mm in June down to 22 mm in February.
How long does snow stay on the ground?
In a normal winter there are about 160 days with at least 1 cm of snow lying.
Are these figures for Sioux Lookout itself?
They are: the normals station that gives them stands in Sioux Lookout.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Sioux Lookout →
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).