This is the short version of Ottawa climate: monthly averages, with the monthly detail underneath. The gap between Jan and Jul is 31.9 C here: -11.3 C against 20.6 C. No month dominates: the wettest is Jun at 3.46 mm/day, the driest Feb at 1.96 mm/day. Taken together that is roughly 979 mm of rain a year for the grid cell. Every run re-reads the source and only rewrites this page when a figure actually changed. Use the table for exact numbers, or the related pages below for neighbouring locations and periods.
Annual mean temperature 5.8 C
Warmest month Jul (20.6 C)
Coldest month Jan (-11.3 C)
Wettest month Jun (3.46 mm/day)
All-time record high 36.0 C
All-time record low -39.9 C
Annual precipitation 982 mm / year
Coordinates 45.4112, -75.6981
Population 1,017,449
Average monthly temperature and rainfall in Ottawa
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
-11.3
1.98
11.2
-39.9
Feb
-10.1
1.96
10.5
-37.7
Mar
-3.7
2.08
25.3
-31.3
Apr
5.0
2.84
26.8
-14.1
May
12.6
2.75
30.8
-4.4
Jun
17.8
3.46
33.4
0.9
Jul
20.6
3.17
36.0
7.7
Aug
19.7
2.84
34.3
6.5
Sep
15.7
2.91
33.3
-1.1
Oct
8.1
3.20
27.0
-5.8
Nov
1.0
2.44
20.0
-19.0
Dec
-6.8
2.59
16.6
-35.2
What the Ottawa climate table shows
Values are multi-decadal climatological averages for the 45.4112, -75.6981 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
How much rain is 3.46 mm/day in a month?
Rain is recorded as a daily mean, so 3.46 mm/day is roughly 105 mm across a 30-day month.
Does Ottawa get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.