Climate averages 1991–2020
Thunder Bay weather
in March.
A freezing month with light precipitation: the 9th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a freezing month in Thunder Bay: daytime highs average -1.7°C and nights cool to about -8.7°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 31 mm of precipitation on roughly 7 days, which makes March a month with light precipitation (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 52 min on an average March day.
The nearest other city in this atlas is Duluth (278 km away). In March its highs average 0.5°C, 2.2°C warmer than Thunder Bay, with 49 mm of precipitation.
Among the 86 cities listed in Canada, Thunder Bay ranks 86th of 86 for the warmest March highs and 12th of 86 for the driest March (precipitation, lowest first). The mean March high of those 86 cities is 3.8°C; Thunder Bay is 5.5°C cooler than that mean.
From March to April, average highs rise by 6.8°C to 5.1°C, and monthly precipitation rises from 31 mm to 54 mm.
The annual picture
March in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Thunder Bay climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -9.6°C-16.6°C | -16.6°C | 29 | 6.5 | 8.89 h |
| February | -8.0°C-15.0°C | -15.0°C | 22 | 4.9 | 10.210 h |
| March, selected | -1.7°C-8.7°C | -8.7°C | 31 | 6.8 | 11.912 h |
| April | 5.1°C-2.2°C | -2.2°C | 54 | 8.3 | 13.614 h |
| May | 12.5°C4.2°C | 4.2°C | 66 | 10.1 | 15.215 h |
| June | 18.3°C10.7°C | 10.7°C | 65 | 10.5 | 16.016 h |
| July | 22.3°C15.3°C | 15.3°C | 76 | 10.6 | 15.716 h |
| August | 22.3°C15.6°C | 15.6°C | 67 | 9.1 | 14.314 h |
| September | 17.8°C11.7°C | 11.7°C | 84 | 10.5 | 12.613 h |
| October | 9.9°C4.8°C | 4.8°C | 72 | 10.4 | 10.911 h |
| November | 2.3°C-2.8°C | -2.8°C | 49 | 7.8 | 9.39 h |
| December | -4.8°C-11.3°C | -11.3°C | 38 | 7.4 | 8.48 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
March in nearby cities
- Duluth in MarchUnited States · 278 kmHigh 0.5°C · Low -6.1°C · 49 mm precipitation
- Sault Ste. Marie in MarchCanada · 424 kmHigh -0.5°C · Low -7.6°C · 46 mm precipitation
- Green Bay in MarchUnited States · 440 kmHigh 4.2°C · Low -5.1°C · 56 mm rain
- Appleton in MarchUnited States · 463 kmHigh 4.2°C · Low -5.2°C · 59 mm rain
- Brooklyn Park in MarchUnited States · 481 kmHigh 4.8°C · Low -4.9°C · 51 mm rain
- Saint Paul in MarchUnited States · 482 kmHigh 5.0°C · Low -4.6°C · 52 mm rain
- Minneapolis in MarchUnited States · 487 kmHigh 4.9°C · Low -4.8°C · 51 mm rain
- Plymouth, United States in MarchUnited States · 493 kmHigh 4.6°C · Low -4.8°C · 51 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Thunder Bay) is explained once on the Thunder Bay year overview and on the Sources, method and limits page.