Climate guideThirty-year normals for Waterloo
Waterloo climate by month
Warm-summer humid continental · DfbBest May–Jun · Sep
Annual mean8°day and night
Seasonal swing27°warmest vs coolest
Precipitation907 mm130 wet days a year
43.47° N, 80.52° WElevation 325 mUTC−4 · Eastern Daylight Time
When to goWaterloo · weather score
Best timeMay–Jun · Sep
October: high / low14° / 4°
iSummary
What the weather is like
Waterloo has a warm-summer humid continental climate (Köppen Dfb): warm summers, cold winters and precipitation in every season.
The warmest month is July, when afternoons average 27° and nights 14°. January is the coolest month, with highs of -2° and lows of -10°. The difference between the warmest and the coolest month is about 27°, a large swing typical of continental interiors.
About 907 mm of precipitation falls in an average year. June is the wettest month (79 mm, 13 wet days) and February the driest (65 mm, 8 wet days). Cloud cover ranges from 29% in July to 58% in December.
Compared with Ottawa, the capital, Waterloo is 0.1° cooler on a July afternoon and receives less precipitation over the year.
Year in figures
- Hottest afternoons
- 27° · July
- Coldest nights
- -10° · January
- Wettest month
- June
- Driest month
- February
- Clearest skies
- July · 29% cloud
- Longest day
- 15 h 24 min
- Shortest day
- 8 h 58 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 | -2° | -1° | 5° | 13° | 20° | 25° | 27° | 26° | 22° | 14° | 7° | 1° |
| Average low | -10° | -10° | -5° | 1° | 7° | 12° | 14° | 13° | 9° | 4° | -1° | -7° |
| Precipitation | 74 mm | 65 mm | 58 mm | 71 mm | 85 mm | 79 mm | 89 mm | 77 mm | 82 mm | 74 mm | 84 mm | 69 mm |
| Wet days (≥1 mm) | 8.3 | 7.7 | 9.5 | 11.7 | 10.5 | 13 | 12.3 | 12.8 | 8.7 | 12.7 | 10.8 | 12.3 |
| Cloud cover | 57% | 49% | 45% | 43% | 39% | 34% | 29% | 30% | 35% | 41% | 52% | 58% |
| Daylight | 9h 19 | 10h 31 | 11h 53 | 13h 25 | 14h 42 | 15h 24 | 15h 06 | 13h 59 | 12h 32 | 11h 04 | 9h 42 | 8h 58 |
| Month score | 27 | 32 | 29 | 39 | 72 | 68 | 64 | 67 | 77 | 46 | 23 | 17 |
ivMonth by month
Waterloo in every month
January27
-2° / -10°
74 mm · 8.3 wet days
February32
-1° / -10°
65 mm · 7.7 wet days
March29
5° / -5°
58 mm · 9.5 wet days
April39
13° / 1°
71 mm · 11.7 wet days
May72
20° / 7°
85 mm · 10.5 wet days
June68
25° / 12°
79 mm · 13 wet days
July64
27° / 14°
89 mm · 12.3 wet days
August67
26° / 13°
77 mm · 12.8 wet days
September77
22° / 9°
82 mm · 8.7 wet days
October46
14° / 4°
74 mm · 12.7 wet days
November23
7° / -1°
84 mm · 10.8 wet days
December17
1° / -7°
69 mm · 12.3 wet days