Longueuil climate
Longueuil is warmest in July, with average highs of 26 °C, and coldest in January, when nights average -14 °C. October is the wettest month (112 mm) and February the driest (60 mm). Figures are 1991–2020 climate normals.
Across a full year Longueuil averages 1,097 mm of rain, 52 days above 25 °C and 140 days below freezing.
Canada · population 229,330 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month July 26 °C
- Coldest month January -14 °C
- Driest month February 60 mm
- Wettest month October 112 mm
- Least cloud August 54 % cloud
- Hottest on record July 35 °C
- Coldest on record January -35 °C
What to expectLongueuil through the year
Longueuil has a clear annual cycle: average daily highs run from -4.8 °C in January to 26 °C in July, a swing of 31 °C in mean temperature across the year.
Counted across a normal year, 52 days a year reach 25 °C, 7 of them reach 30 °C, 140 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in July.
Rain is spread fairly evenly through the year, from 60 mm in February to 112 mm in October. There is no dry season to aim for.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | -4.8 °C | 73 mm | 68 % |
| February | -3.0 °C | 60 mm | 64 % |
| March | 2.8 °C | 74 mm | 64 % |
| April | 11.0 °C | 101 mm | 65 % |
| May | 18.8 °C | 98 mm | 62 % |
| June | 23.7 °C | 106 mm | 61 % |
| July | 25.9 °C | 101 mm | 55 % |
| August | 24.8 °C | 101 mm | 54 % |
| September | 20.7 °C | 98 mm | 55 % |
| October | 13.2 °C | 112 mm | 63 % |
| November | 5.9 °C | 87 mm | 70 % |
| December | -1.0 °C | 85 mm | 71 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | -4.8 °C | -13.6 °C | -9.5 °C | 12.4 °C | -34.7 °C | 0 | 0 | 30 |
| February | -3.0 °C | -12.2 °C | -8.0 °C | 15.7 °C | -34.4 °C | 0 | 0 | 27 |
| March | 2.8 °C | -6.4 °C | -2.3 °C | 24.1 °C | -27.1 °C | 0 | 0 | 26 |
| April | 11.0 °C | 1.0 °C | 5.6 °C | 27.5 °C | -13.7 °C | 0 | 0 | 12 |
| May | 18.8 °C | 8.5 °C | 13.4 °C | 35.1 °C | -1.4 °C | 3 | 0 | 0 |
| June | 23.7 °C | 14.5 °C | 18.9 °C | 33.9 °C | 4.4 °C | 11 | 2 | 0 |
| July | 25.9 °C | 17.4 °C | 21.5 °C | 35.4 °C | 9.6 °C | 18 | 3 | 0 |
| August | 24.8 °C | 16.7 °C | 20.5 °C | 34.6 °C | 9.2 °C | 15 | 1 | 0 |
| September | 20.7 °C | 12.6 °C | 16.4 °C | 32.2 °C | 0.9 °C | 5 | 1 | 0 |
| October | 13.2 °C | 6.2 °C | 9.3 °C | 25.8 °C | -4.2 °C | 0 | 0 | 2 |
| November | 5.9 °C | -0.3 °C | 2.5 °C | 19.5 °C | -17.7 °C | 0 | 0 | 16 |
| December | -1.0 °C | -8.1 °C | -4.7 °C | 15.1 °C | -32.0 °C | 0 | 0 | 28 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 73 mm | 11 | 9.1 h/day | 68 % | 75 % | 20 km/h |
| February | 60 mm | 9 | 10 h/day | 64 % | 74 % | 20 km/h |
| March | 74 mm | 11 | 12 h/day | 64 % | 71 % | 20 km/h |
| April | 101 mm | 11 | 14 h/day | 65 % | 66 % | 20 km/h |
| May | 98 mm | 12 | 15 h/day | 62 % | 66 % | 19 km/h |
| June | 106 mm | 12 | 16 h/day | 61 % | 70 % | 18 km/h |
| July | 101 mm | 12 | 15 h/day | 55 % | 72 % | 17 km/h |
| August | 101 mm | 12 | 14 h/day | 54 % | 74 % | 16 km/h |
| September | 98 mm | 10 | 13 h/day | 55 % | 74 % | 17 km/h |
| October | 112 mm | 12 | 11 h/day | 63 % | 75 % | 19 km/h |
| November | 87 mm | 12 | 9.5 h/day | 70 % | 76 % | 20 km/h |
| December | 85 mm | 12 | 8.7 h/day | 71 % | 77 % | 20 km/h |
Where Longueuil ranks
| Ranking | Position | Value |
|---|---|---|
| The coolest places in North America in February | 11th of 50 | -3.0 °C |
| The coolest places in North America in January | 11th of 50 | -4.8 °C |
| The coolest places in North America in March | 12th of 50 | 2.8 °C |
| The coolest places in North America in December | 13th of 50 | -1.0 °C |
| The coolest places in North America in November | 14th of 50 | 5.9 °C |
| The coolest places in North America year-round | 14th of 50 | 11 °C |
Planning a trip? See the best time to visit Longueuil.
QuestionsCommon questions about Longueuil’s climate
When is the best time to visit Longueuil?
That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and February the driest. The month-by-month table above has the full picture.
How hot does Longueuil get?
In July, the warmest month, daily highs average 26 °C. About 7 days a year pass 30 °C. The highest value in the 1991–2020 record is 35 °C.
How cold does it get in winter?
Nights average -14 °C in January, the coldest month. A normal year has 140 nights below freezing.
Which month is wettest in Longueuil?
October, averaging 112 mm over 12 days with rain. The driest month is February with 60 mm. The year as a whole averages 1,097 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Longueuil rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Data point
- 45.515°, -73.468° (the coordinates the reanalysis values are taken for)
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.