Hornby Island, Canada Climate
The warmest month is August, with an average high of 21°C; the coldest is February, with an average low of 4°C. A normal year brings 1110 mm of precipitation.
Temperature through the year
The normal daily high and low and the record for every date at Sisters Island, since 1992. The line marks today.
- Normal low
- Normal high
- Record high
- Record low
Normals for Sep 28
- Normal high
- 17°C
- Normal low
- 12°C
- Record high
- 22°Cin 2017
- Record low
- 9°Cin 2019
- Chance of a wet day
- 34%
- Daylight
- 11 h 49 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 | Record high | Record low | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 7°C | 4°C | 16°C (2024) | -8°C (2024) | 159 mm | 18.5 |
| February | 8°C | 4°C | 14°C (2023) | -4°C (2019) | 98 mm | 14.4 |
| March | 9°C | 6°C | 19°C (2004) | -3°C (2002) | 108 mm | 16.8 |
| April | 12°C | 8°C | 22°C (1998) | 1°C (2020) | 74 mm | 13.5 |
| May | 16°C | 11°C | 29°C (2023) | 3°C (2002) | 49 mm | 10.6 |
| June | 18°C | 14°C | 32°C (2021) | 7°C (1999) | 47 mm | 10.4 |
| July | 21°C | 16°C | 31°C (2009) | 11°C (1999) | 32 mm | 7.5 |
| August | 21°C | 16°C | 30°C (2022) | 11°C (2008) | 38 mm | 7.2 |
| September | 18°C | 14°C | 29°C (2022) | 8°C (2009) | 56 mm | 9.7 |
| October | 13°C | 10°C | 25°C (2022) | 4°C (2023) | 120 mm | 15.7 |
| November | 10°C | 7°C | 18°C (2020) | -5°C (2010) | 172 mm | 19.1 |
| December | 7°C | 4°C | 16°C (2021) | -7°C (2021) | 157 mm | 19.3 |
| Year | 13°C | 9°C | 1110 mm | 163 |
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.
1110 mm in a normal year, most in November.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Hornby Island.
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 | 2°C | 85% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | 2°C | 82% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | 3°C | 81% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | 5°C | 77% | 100% | 0% | 0% | 0% | 0% | 0% |
| May | 8°C | 75% | 97% | 3% | 0% | 0% | 0% | 0% |
| June | 11°C | 76% | 81% | 18% | 1% | 0% | 0% | 0% |
| July | 14°C | 76% | 36% | 53% | 11% | 0% | 0% | 0% |
| August | 14°C | 76% | 34% | 53% | 13% | 0% | 0% | 0% |
| September | 11°C | 78% | 77% | 22% | 2% | 0% | 0% | 0% |
| October | 8°C | 83% | 99% | 1% | 0% | 0% | 0% | 0% |
| November | 4°C | 85% | 100% | 0% | 0% | 0% | 0% | 0% |
| December | 2°C | 86% | 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 July, with the sky 51 percent covered on average; the cloudiest is December, at 77 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 December, averaging 11.9 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 18, with 16 h 18 min of daylight; the shortest is Dec 17, with 8 h 09 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 Hornby Island 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.
A record is the highest or lowest value on the date in every year the station has reported, back to 1992. It rests on one station, so a neighbor a few miles away can hold different ones.
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
Nearby
Sources
Records: NOAA GHCN-Daily, station CA001027403, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: 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 2026-09-29. Sun and moon: computed with the NOAA solar equations and Meeus.