Yellowknife, Canada Climate
The warmest month is July, with an average high of 21°C; the coldest is January, with an average low of -34°C. A normal year brings 407 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 25
- Normal high
- 7°C
- Normal low
- 1°C
- Reanalysis high
- 20°Cin 1995
- Reanalysis low
- -5°Cin 2000
- Chance of a wet day
- 30%
- Daylight
- 11 h 57 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | -26°C | -34°C | 0°C (2000) | -56°C (1996) | 19 mm | 6.2 |
| February | -22°C | -31°C | 0°C (2012) | -53°C (2008) | 14 mm | 5.7 |
| March | -13°C | -23°C | 1°C (1993) | -49°C (1991) | 22 mm | 6.2 |
| April | -2°C | -10°C | 17°C (2010) | -36°C (1995) | 21 mm | 6.0 |
| May | 10°C | 2°C | 25°C (1998) | -19°C (2002) | 43 mm | 9.3 |
| June | 18°C | 10°C | 29°C (1995) | 0°C (2011) | 54 mm | 9.0 |
| July | 21°C | 13°C | 31°C (1996) | 4°C (1991) | 56 mm | 12.4 |
| August | 18°C | 11°C | 30°C (1994) | 0°C (1997) | 53 mm | 9.3 |
| September | 10°C | 4°C | 23°C (2013) | -8°C (2005) | 48 mm | 9.0 |
| October | -2°C | -8°C | 13°C (2008) | -33°C (1996) | 34 mm | 9.3 |
| November | -17°C | -24°C | 2°C (2002) | -46°C (1991) | 24 mm | 6.0 |
| December | -24°C | -31°C | -1°C (1999) | -53°C (2009) | 19 mm | 6.2 |
| Year | -3°C | -10°C | 407 mm | 95 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
407 mm in a normal year, most in July.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Yellowknife.
Days with a mean dew point of 18°C or more are rare here in every month.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | -31°C | 95% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | -27°C | 96% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | -19°C | 95% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | -8°C | 90% | 100% | 0% | 0% | 0% | 0% | 0% |
| May | 2°C | 75% | 99% | 1% | 0% | 0% | 0% | 0% |
| June | 8°C | 67% | 89% | 10% | 1% | 0% | 0% | 0% |
| July | 10°C | 64% | 76% | 21% | 3% | 0% | 0% | 0% |
| August | 9°C | 69% | 88% | 12% | 1% | 0% | 0% | 0% |
| September | 3°C | 78% | 100% | 0% | 0% | 0% | 0% | 0% |
| October | -6°C | 90% | 100% | 0% | 0% | 0% | 0% | 0% |
| November | -21°C | 95% | 100% | 0% | 0% | 0% | 0% | 0% |
| December | -28°C | 96% | 100% | 0% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is March, with the sky 52 percent covered on average; the cloudiest is October, at 75 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is May, averaging 19.1 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 19, with 20 h 00 min of daylight; the shortest is Dec 20, with 4 h 57 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Yellowknife in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.