Photo: Roncanada · CC BY 4.0More rain and snow fall on Shannon than on 87% of Canadian towns: 1,173 mm a year
High summer brings afternoon highs near 25.0°C. By January nights alone, it runs colder than 80% of Canadian towns. Temperatures cover 42°C across the year, low to high. Heating does most of its work from October to April, in months below 10°C on average.
These are not Shannon’s own readings: ECCC keeps no normals there, so the page uses Québec Jean Lesage (Airport), 14 km south-east.
A year in Shannon at a glance
Each month’s typical high and low, in °C.
What stands out about Shannon’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Shannon feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 170 frosts and 100 warm days a year
Frost comes from October to May; in January almost every night freezes. On about 27 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
About 1,173 mm of rain and snow a year
July is the wettest month and February the driest. On about 135 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
About 299 cm of snow a year
Snow falls from October to April, most of all in December (about 77 cm).
Snowfall by month
Centimetres
Snowfall: Lauzon, 33 km away (Québec Jean Lesage (Airport) records no complete year of it).
Heating a home in Shannon
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. In heating terms, homes need more heating than 64% of Canadian towns.
Living with Shannon’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Plant out after about 10 May; the first frost of autumn usually arrives near 5 October, leaving roughly 148 days without frost.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: Jun, Jul, Aug and Sep.
Parks & trails →Expect around 56 days a year when the wind chill sinks below −20.
Summer brings about 34 days when the humidex passes 30.
Ice storms, floods and heat waves are risks, not averages: they are on Shannon’s hazards page.
Flood & hazards →ECCC’s normals location: Québec Jean Lesage (Airport)
ECCC builds the Québec Jean Lesage (Airport) normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 14 km south-east |
| Station altitude | 74 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Lauzon, 33 km |
| Coldest reading, 1991–2020 | −36.7°C |
| Hottest reading, 1991–2020 | 34.2°C |
| Average wind | 13.2 km/h on average, most often from the west |
| Next-nearest location | Ste-Foy (U. Laval), 19 km |
How Shannon compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Quebec.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Shannon’s own would show the same figures). Distances here run 18–28 km: that is how far the nearest places with figures are from Shannon.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Shannon Québec Jean Lesage (Airport) | 25.0°C | −16.7°C | 1,173 mm |
| Québec 18 km · Ste-Foy (U. Laval) | 25.1°C about the same | −15.6°C 1.1°C milder | 1,173 mm |
| Sainte-Brigitte-de-Laval 27 km · Lauzon | 24.9°C about the same | −16.6°C about the same | 1,216 mm |
Shannon weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −7.1°C | −16.7°C | −11.9°C | 87 mm | 62 cm |
| February | −5.0°C | −15.7°C | −10.4°C | 66 mm | 71 cm |
| March | 0.4°C | −9.3°C | −4.5°C | 78 mm | 51 cm |
| April | 8.3°C | −1.2°C | 3.5°C | 94 mm | 12 cm |
| May | 17.5°C | 5.6°C | 11.6°C | 92 mm | 0 cm |
| June | 22.5°C | 10.8°C | 16.7°C | 115 mm | 0 cm |
| July | 25.0°C | 13.9°C | 19.5°C | 119 mm | 0 cm |
| August | 24.0°C | 12.8°C | 18.4°C | 109 mm | 0 cm |
| September | 19.1°C | 8.3°C | 13.7°C | 111 mm | 0 cm |
| October | 11.3°C | 2.4°C | 6.8°C | 116 mm | 2 cm |
| November | 3.6°C | −3.8°C | −0.1°C | 91 mm | 24 cm |
| December | −3.3°C | −11.4°C | −7.3°C | 96 mm | 77 cm |
| Year | 9.7°C | −0.4°C | 4.7°C | 1,173 mm | 299 cm |
January has run from −36.7°C to 17.7°C in thirty years
Year to year, January varies most (a standard deviation of 2.9°C around −11.9°C) and August least (0.9°C).
Where Shannon’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Québec Jean Lesage (Airport), the nearest location with a full year of temperatures.
- Other locations: where a location publishes no full year of precipitation or snowfall, the nearest one that does supplies it, named beside those figures.
- Comparisons: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- Not on this page: sunshine, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Shannon’s climate
How warm does Shannon get in summer?
The year’s warmest days come in July, with highs averaging 25.0°C.
How cold does Shannon get in winter?
Of all twelve months, January has the coldest nights, about −16.7°C.
How much rain and snow does Shannon get?
July is the wettest month at 119 mm and February the driest at 66 mm, for 1,173 mm over the year.
Are these figures for Shannon itself?
No: Shannon has no normals location, so the figures come from Québec Jean Lesage (Airport), the nearest with 1991–2020 normals.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Shannon →
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).