Delta climate by month
What the weather is like
Delta has an oceanic climate (Köppen Cfb): rain spread through the year and no real dry season.
The warmest month is July, when afternoons average 24° and nights 13°. December is the coolest month, with highs of 7° and lows of 1°. The difference between the warmest and the coolest month is about 15°.
About 1,335 mm of precipitation falls in an average year. December is the wettest month (181 mm, 22 wet days) and August the driest (44 mm, 10 wet days). Cloud cover ranges from 24% in August to 55% in January.
The sea reaches about 16° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Ottawa, the capital, Delta is 3° cooler on a July afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 24° · July
- Coldest nights
- 1° · December
- Wettest month
- December
- Driest month
- August
- Clearest skies
- August · 24% cloud
- Warmest sea
- 16° · August
- Longest day
- 16 h 11 min
- Shortest day
- 8 h 15 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 7° | 9° | 11° | 15° | 18° | 21° | 24° | 24° | 20° | 15° | 10° | 7° |
| Average low | 1° | 1° | 3° | 5° | 8° | 11° | 13° | 13° | 10° | 6° | 3° | 1° |
| Precipitation | 185 mm | 116 mm | 122 mm | 98 mm | 76 mm | 62 mm | 40 mm | 44 mm | 64 mm | 140 mm | 207 mm | 181 mm |
| Wet days (≥1 mm) | 21.1 | 17.6 | 21.4 | 18.7 | 16.4 | 16.4 | 10.7 | 9.8 | 13.2 | 19 | 21.4 | 21.5 |
| Cloud cover | 55% | 48% | 49% | 45% | 40% | 37% | 26% | 24% | 28% | 43% | 54% | 54% |
| Sea temperature | 7° | 7° | 8° | 10° | 12° | 14° | 16° | 16° | 14° | 11° | 9° | 8° |
| Daylight | 8h 41 | 10h 11 | 11h 51 | 13h 43 | 15h 18 | 16h 11 | 15h 49 | 14h 25 | 12h 38 | 10h 50 | 9h 10 | 8h 15 |
| Month score | 15 | 18 | 24 | 43 | 63 | 64 | 75 | 77 | 69 | 43 | 15 | 15 |