Jefferson has colder winter nights than 95% of Canadian towns
Midsummer highs settle at about 25.8°C. By precipitation alone, it ranks drier than 72% of Canadian towns. July is the wettest month, February the driest. Plan for rain or snow on about 80 days a year, the days with 1 mm or more.
1991–2020 normals from ECCC’s Winnipeg Richardson (Airport) location, 7.6 km west.
A year in Jefferson at a glance
Each month’s typical high and low, in °C.
What stands out about Jefferson’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Manitoba beside it.
What a year in Jefferson feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
193 frost days and 110 days above 20°C a year
From September to May frost is routine, and in January it comes on almost every night. Deep cold, under −20°C, comes on about 52 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 519 mm of rain and snow a year
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 126 cm of snow a year
From October to May snow is likely; December is the peak, at about 27 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Jefferson
91% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year. Over a year, a home here needs more heating than 89% of Canadian towns.
Living with Jefferson’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Seedlings can go out once the average last frost, around 23 May, has passed; autumn’s first, near 22 September, ends a season of about 122 days.
Afternoons of 17–27°C and nights of at least 8°C arrive in Jun, Jul and Aug.
Parks & trails →The wind chill passes −20 on about 86 days in a normal year.
About 37 days a year turn sultry, with the humidex past 30.
For the weather that does damage, from ice storms to floods, see Jefferson’s hazards page.
Flood & hazards →ECCC’s normals location: Winnipeg Richardson (Airport)
Winnipeg Richardson (Airport) is a composite: ECCC joins 4 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 7.6 km west |
| Station altitude | 239 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −41.8°C |
| Hottest reading, 1991–2020 | 37.8°C |
| Average wind | 17.5 km/h on average, most often from the south |
| Next-nearest location | Gimli, 77 km |
How Jefferson compares
Against the 2,611 Canadian towns and neighbourhoods of 2,500 or more, each read from its own normals location; the dots are the other locations those towns use in Manitoba.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Jefferson’s own would show the same figures). Distances here run 37–46 km: that is how far the nearest places with figures are from Jefferson.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Jefferson Winnipeg Richardson (Airport) | 25.8°C | −21.2°C | 519 mm |
| Brokenhead 37 km · Pinawa | 25.2°C 0.6°C cooler | −21.7°C 0.5°C colder | 571 mm |
| Cartier 46 km · Portage Southport | 25.4°C about the same | −19.1°C 2.1°C milder | 493 mm |
Jefferson weather by month
Average daily high and low, mean temperature, rain and snow (as water) and snowfall by month, 1991–2020.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −11.4°C | −21.2°C | −16.3°C | 18 mm | 25 cm |
| February | −8.8°C | −19.3°C | −14.1°C | 13 mm | 12 cm |
| March | −0.9°C | −11.2°C | −6.1°C | 26 mm | 19 cm |
| April | 10.0°C | −2.5°C | 3.8°C | 33 mm | 14 cm |
| May | 18.1°C | 4.2°C | 11.1°C | 70 mm | 4 cm |
| June | 23.3°C | 10.9°C | 17.1°C | 74 mm | 0 cm |
| July | 25.8°C | 13.2°C | 19.5°C | 77 mm | 0 cm |
| August | 25.4°C | 11.9°C | 18.7°C | 74 mm | 0 cm |
| September | 19.6°C | 6.9°C | 13.3°C | 53 mm | 0 cm |
| October | 10.4°C | −0.2°C | 5.1°C | 38 mm | 4 cm |
| November | 0.1°C | −8.8°C | −4.4°C | 25 mm | 21 cm |
| December | −8.2°C | −17.3°C | −12.7°C | 19 mm | 27 cm |
| Year | 8.6°C | −2.8°C | 2.9°C | 519 mm | 126 cm |
December varies most from one year to the next (4.1°C), July least
Records from 1991 to 2020: no month spans more than March, between −37.4°C (2003) and 23.7°C (2012).
Where Jefferson’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Winnipeg Richardson (Airport), the nearest location with a full year of temperatures.
- Comparisons: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- Not on this page: a sunshine figure (ECCC published none for 1991–2020) and any lapse-rate correction for height, as the town has no elevation here.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Jefferson’s climate
How warm does Jefferson get in summer?
On a normal day in July the thermometer climbs to 25.8°C, the warmest of the year.
How cold does Jefferson get in winter?
Deep winter means January, when nights average −21.2°C.
How much rain and snow does Jefferson get?
Some 519 mm falls in a year. Most of it comes in July (77 mm), the least in February (13 mm).
Are these figures for Jefferson itself?
Nearly: Winnipeg Richardson (Airport), the location behind them, sits just beyond Jefferson’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Jefferson →
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).