Markham, Ontario, Canada weather records
Record high and low temperatures for Markham, Ontario, Canada, by month, by season, and all-time, with the dates they occurred, across 1981–2026 of daily climate history. Its hottest day on record reached 37°C on 1988-07-07; its coldest fell to -29°C on 2015-02-16.
Records by month
The warmest (▲) and coldest (▼) both the daytime high and the overnight low have ever been in each calendar month, so each column shows its record high and its record low. Tap a month for its full averages and typical range.
| Month | Daytime high | Overnight low |
|---|---|---|
| January | 12°C2008-01-08
-20°C1981-01-11
|
8°C2008-01-08
-27°C1982-01-22
|
| February | 13°C2023-02-15
-19°C2015-02-15
|
5°C1981-02-19
-29°C2015-02-16
|
| March | 24°C2012-03-22
-15°C2003-03-03
|
12°C1998-03-31
-28°C2003-03-03
|
| April | 27°C1990-04-27
-6°C1982-04-06
|
14°C1991-04-08
-14°C2003-04-06
|
| May | 32°C2012-05-28
4°C2020-05-08
|
20°C2006-05-31
-3°C2020-05-12
|
| June | 36°C1995-06-19
11°C1992-06-21
|
22°C2025-06-22
2°C1983-06-08
|
| July | 37°C1988-07-07
15°C1984-07-07
|
24°C2013-07-19
8°C1982-07-01
|
| August | 36°C2006-08-01
14°C1986-08-28
|
25°C2006-08-01
4°C1982-08-29
|
| September | 34°C2023-09-04
9°C1993-09-29
|
22°C2015-09-08
0°C1989-09-27
|
| October | 30°C2023-10-03
2°C2008-10-29
|
17°C2007-10-06
-4°C1988-10-30
|
| November | 21°C2022-11-05
-8°C1987-11-21
|
13°C2024-11-05
-13°C2018-11-22
|
| December | 17°C1982-12-03
-15°C1983-12-26
|
11°C1982-12-03
-26°C1983-12-20
|
Records by season
The warmest (▲) and coldest (▼) both the daytime high and the overnight low have reached in each meteorological season (Northern Hemisphere, each a three-month span).
| Season | Daytime high | Overnight low |
|---|---|---|
| Winter (Dec–Feb) | 17°C1982-12-03
-20°C1981-01-11
|
11°C1982-12-03
-29°C2015-02-16
|
| Spring (Mar–May) | 32°C2012-05-28
-15°C2003-03-03
|
20°C2006-05-31
-28°C2003-03-03
|
| Summer (Jun–Aug) | 37°C1988-07-07
11°C1992-06-21
|
25°C2006-08-01
2°C1983-06-08
|
| Autumn (Sep–Nov) | 34°C2023-09-04
-8°C1987-11-21
|
22°C2015-09-08
-13°C2018-11-22
|
All-time records
The most extreme value Markham has recorded for each metric across its entire history.
High
Low
Feels-like
Humidity
Wind
Precip
For rainfall, the “driest” figure is the longest run of consecutive days without measurable rain, dated to when that dry spell began.