Sudbury Temperatures: Averages by Month
The numbers here tell you how hot and cold the weather usually is in Sudbury, Ontario during each month of the year.
The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius.
Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.
To find out how often it rises over 10, 20 or 30 °C each month in Sudbury, scroll down farther. There are also monthly and yearly counts of days with frost and cold weather.
The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1981 to 2010 weather.
| High °F | Low °F | High °C | Low °C | |
|---|---|---|---|---|
| 19 | 1 | January | -7 | -17 |
| 21 | 3 | February | -6 | -16 |
| 33 | 14 | March | 1 | -10 |
| 45 | 27 | April | 7 | -3 |
| 65 | 43 | May | 18 | 6 |
| 72 | 51 | June | 22 | 10 |
| 79 | 56 | July | 26 | 13 |
| 75 | 55 | August | 24 | 13 |
| 67 | 47 | September | 19 | 9 |
| 52 | 36 | October | 11 | 2 |
| 36 | 23 | November | 2 | -5 |
| 24 | 11 | December | -4 | -12 |
| 49 | 30 | Year | 9 | -1 |
| High °F | Low °F | High °C | Low °C | |
|---|---|---|---|---|
| 18 | 0 | January | -8 | -18 |
| 22 | 3 | February | -6 | -16 |
| 33 | 14 | March | 0 | -10 |
| 49 | 29 | April | 9 | -2 |
| 63 | 41 | May | 17 | 5 |
| 72 | 51 | June | 22 | 11 |
| 77 | 56 | July | 25 | 13 |
| 74 | 54 | August | 23 | 12 |
| 64 | 46 | September | 18 | 8 |
| 51 | 35 | October | 10 | 2 |
| 37 | 24 | November | 3 | -5 |
| 24 | 9 | December | -4 | -13 |
| 49 | 30 | Year | 9 | -1 |
Days of Hot Weather in Sudbury
The hottest days at Sudbury usually have temperatures peaking in the low-thirties Celsius. The city averages six days a year with thirty-degree weather, which can show up from May to September. The temperature does climb over 35 °C (95 °F), but that's quite uncommon, happening on average just once or twice a decade.
| 10 °C 50 °F |
20 °C 68 °F |
30 °C 86 °F | |
|---|---|---|---|
| January | 0 | 0 | 0 |
| February | 0 | 0 | 0 |
| March | 2 | 0 | 0 |
| April | 13 | 2 | 0 |
| May | 27 | 9 | 0 |
| June | 30 | 20 | 2 |
| July | 31 | 28 | 3 |
| August | 31 | 25 | 1 |
| September | 28 | 11 | 0 |
| October | 15 | 1 | 0 |
| November | 3 | 0 | 0 |
| December | 0 | 0 | 0 |
| Year | 180 | 96 | 6 |
When Sudbury Has Frosty Weather
Sudbury typically has 178 days a year when the minimum temperature is at 0 °C or below. The average date for the last frost in spring is May 17. Frost normally returns here on October 1. The frost-free period extends for 136 days on average between the final spring frost and the first fall frost.
| 0 °C 32 °F | |
|---|---|
| January | 31 |
| February | 28 |
| March | 29 |
| April | 19 |
| May | 4 |
| June | 0 |
| July | 0 |
| August | 0 |
| September | 1 |
| October | 12 |
| November | 25 |
| December | 30 |
| Year | 178 |
How Often Sudbury Has Cold Temperatures
Sudbury's chilliest winter nights have lows below -30 °C (-22 °F). The city averages three nights a year, mainly in January, when the temperature gets that cold.
From October to April, Sudbury can remain below freezing all day long. The city typically has 100 days a year when the temperature never rises above 0 °C.
| -2 °C 28 °F |
-10 °C 14 °F |
-20 °C -4 °F | |
|---|---|---|---|
| January | 30 | 25 | 13 |
| February | 27 | 22 | 9 |
| March | 27 | 15 | 3 |
| April | 13 | 1 | 0 |
| May | 1 | 0 | 0 |
| June | 0 | 0 | 0 |
| July | 0 | 0 | 0 |
| August | 0 | 0 | 0 |
| September | 0 | 0 | 0 |
| October | 5 | 0 | 0 |
| November | 19 | 5 | 0 |
| December | 28 | 19 | 6 |
| Year | 151 | 88 | 32 |
References
Environment Canada. Meteorological Service of Canada. Canadian Climate Normals. 1981-2010 Climate Normals & Averages.
Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.