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Observed at: Toronto Buttonville Municipal Airport
Date: Thursday January 21, 2021 at 02:00 EST
Temp.: -2.1 °C
Wind Chill: -9
Wind: WSW 26 gust 39 km/h
Humidity: 71 %
Dew point: -6.7 °C
Pressure: 100.6 kPa
Tendency:
Sunrise: 07:44
Sunset: 17:12
Normals:
Max -3°C Min -11°C
Yesterday
  Max: °C
  Min: °C
  Rainfall: mm
 Extended Forecast - Environment Canada
  Thursday
Chance of flurries (40%)
Chance of flurries
Max: 1°C
 Friday
Chance of flurries (40%)
Chance of flurries
Max: -4°C
 Saturday
Sunny
Sunny
Max: -7°C
 Sunday
Cloudy
Cloudy
Max: -6°C
 Monday
Periods of snow
Periods of snow
Max: -4°C
 Tuesday
A mix of sun and cloud
A mix of sun and cloud
Max: -6°C
Wednesday night
Chance of flurries (30%)
Chance of flurries
Min: -6°C *
 Thursday night
Flurries
Flurries
Min: -1°C
 Friday night
Chance of flurries (30%)
Chance of flurries
Min: -13°C
 Saturday night
Cloudy periods
Cloudy periods
Min: -12°C
 Sunday night
Periods of snow
Periods of snow
Min: -7°C
 Monday night
Cloudy periods
Cloudy periods
Min: -9°C

* - Denotes an abnormal temperature trend.

Forecast

Markham, ON (Issued: Wednesday January 20, 2021 at 15:30 EST)

Tonight
Mainly cloudy. 30 percent chance of flurries early this evening. Periods of snow and local blowing snow beginning after midnight. Amount 2 cm. Wind becoming southwest 20 km/h gusting to 40 after midnight. Low minus 6 with temperature rising to minus 1 by morning. Wind chill minus 12 this evening.
Thursday
Periods of snow and local blowing snow ending in the morning then cloudy with 40 percent chance of flurries. Wind west 30 km/h gusting to 50. Temperature steady near plus 1. Wind chill minus 7 in the morning. UV index 1 or low.
Thursday night
Cloudy. 40 percent chance of flurries early in the evening. A few flurries beginning in the evening. Local blowing snow overnight. Local amount 2 to 4 cm. Wind west 30 km/h gusting to 50. Temperature steady near minus 1. Wind chill minus 9 overnight.
Friday
A mix of sun and cloud with 40 percent chance of flurries. High minus 4.
Friday night
Cloudy periods with 30 percent chance of flurries. Low minus 13.
Saturday
Sunny. High minus 7.
Saturday night
Cloudy periods. Low minus 12.
Sunday
Cloudy. High minus 6.
Sunday night
Periods of snow. Low minus 7.
Monday
Periods of snow. High minus 4.
Monday night
Cloudy periods. Low minus 9.
Tuesday
A mix of sun and cloud. High minus 6.
Averages and extremes
Highest temperature(1987-2015)3.9 °C1999
Lowest temperature(1987-2015)-25.2 °C2005
Average highn/a 
Average lown/a 
Averagen/a 
Greatest rainfall(1987-2015)12.0 mm1993
Greatest snowfall(1987-2015)4.2 cm2006
Greatest precipitation(1987-2015)12.0 mm1993
Most snow on the ground(1987-2015)40.0 cm2009
Monthly frequency of precipitation54.0 % 

24 Hour Forecast - Markham, ON

Date/Time
(EST)		 Temp.
(°C)
Weather Conditions
LOP †		 Wind
(km/h)		 Wind
Chill
21 January 2021
03:00 -3 Periods of snow (100%)  Periods of snow High SW 20 gust 40 -9
04:00 -3 Periods of snow (100%)  Periods of snow High SW 20 gust 40 -9
05:00 -2 Periods of snow (100%)  Periods of snow High SW 20 gust 40 -8
06:00 -2 Periods of snow (100%)  Periods of snow High SW 20 gust 40 -7
07:00 -1 Periods of snow (100%)  Periods of snow High SW 20 gust 40 -7
08:00 -1 Chance of flurries (40%)  Chance of flurries Low SW 20 gust 40 -6
09:00 0 Chance of flurries (40%)  Chance of flurries Low SW 20 gust 40 ‡
10:00 0 Chance of flurries (40%)  Chance of flurries Low SW 20 gust 40 ‡
11:00 1 Chance of flurries (40%)  Chance of flurries Low SW 20 gust 40 ‡
12:00 1 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
13:00 2 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
14:00 2 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
15:00 2 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
16:00 2 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
17:00 2 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
18:00 1 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
19:00 1 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
20:00 1 Chance of flurries (40%)  Chance of flurries Low W 30 gust 50 ‡
21:00 0 A few flurries (80%)  A few flurries High W 30 gust 50 ‡
22:00 0 A few flurries (80%)  A few flurries High W 30 gust 50 ‡
23:00 0 A few flurries (80%)  A few flurries High W 30 gust 50 ‡
22 January 2021
00:00 -1 A few flurries (80%)  A few flurries High NW 30 gust 50 -7
01:00 -1 A few flurries (80%)  A few flurries High NW 30 gust 50 -8
02:00 -1 A few flurries (80%)  A few flurries High NW 30 gust 50 -8
 
† Likelihood of Precipitation (LOP) as described in the public forecast as a chance of measurable precipitation for a period of time.
  Nil: 0%
  Low: 40% or below
  Medium: 60% or 70%
  High: Above 70%
‡ Value not significant

Environment Canada