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Climate guideThirty-year normals for Hamilton
Hamilton climate by month
Hot-summer humid continental · DfaBest May–Jun · Sep
Annual mean9°day and night
Seasonal swing27°warmest vs coolest
Precipitation971 mm162 wet days a year
43.25° N, 79.85° WElevation 95 mUTC−4 · Eastern Daylight Time
When to goHamilton · weather score
Best timeMay–Jun · Sep
October: high / low16° / 6°
iSummary
What the weather is like
Hamilton has a hot-summer humid continental climate (Köppen Dfa): warm summers, cold winters and precipitation in every season.
The warmest month is July, when afternoons average 29° and nights 16°. January is the coolest month, with highs of 0° and lows of -8°. The difference between the warmest and the coolest month is about 27°, a large swing typical of continental interiors.
About 971 mm of precipitation falls in an average year. October is the wettest month (77 mm, 16 wet days) and February the driest (67 mm, 11 wet days). Cloud cover ranges from 28% in July to 53% in January.
Compared with Ottawa, the capital, Hamilton is 2.1° warmer on a July afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 29° · July
- Coldest nights
- -8° · January
- Wettest month
- October
- Driest month
- February
- Clearest skies
- July · 28% cloud
- Longest day
- 15 h 22 min
- Shortest day
- 9 h 00 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 0° | 2° | 7° | 14° | 21° | 26° | 29° | 28° | 24° | 16° | 9° | 3° |
| Average low | -8° | -8° | -3° | 2° | 8° | 14° | 16° | 16° | 12° | 6° | 0° | -4° |
| Precipitation | 69 mm | 67 mm | 70 mm | 82 mm | 86 mm | 84 mm | 96 mm | 87 mm | 92 mm | 77 mm | 89 mm | 72 mm |
| Wet days (≥1 mm) | 14.2 | 10.5 | 11.2 | 12.5 | 12.3 | 14.7 | 14.7 | 15.2 | 10.8 | 15.7 | 14.2 | 15.7 |
| Cloud cover | 53% | 47% | 43% | 42% | 38% | 33% | 28% | 29% | 34% | 39% | 48% | 53% |
| Daylight | 9h 20 | 10h 32 | 11h 53 | 13h 24 | 14h 40 | 15h 22 | 15h 05 | 13h 59 | 12h 32 | 11h 04 | 9h 43 | 9h 00 |
| Month score | 15 | 26 | 26 | 46 | 68 | 60 | 51 | 55 | 73 | 53 | 18 | 15 |
ivMonth by month
Hamilton in every month
January15
0° / -8°
69 mm · 14.2 wet days
February26
2° / -8°
67 mm · 10.5 wet days
March26
7° / -3°
70 mm · 11.2 wet days
April46
14° / 2°
82 mm · 12.5 wet days
May68
21° / 8°
86 mm · 12.3 wet days
June60
26° / 14°
84 mm · 14.7 wet days
July51
29° / 16°
96 mm · 14.7 wet days
August55
28° / 16°
87 mm · 15.2 wet days
September73
24° / 12°
92 mm · 10.8 wet days
October53
16° / 6°
77 mm · 15.7 wet days
November18
9° / 0°
89 mm · 14.2 wet days
December15
3° / -4°
72 mm · 15.7 wet days