Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
80.7
78
25
100
71
83
February
90.4
92
70
94
92
98
March
90.5
87
83
91
89
93
April
87.6
73
83
91
93
88
May
88.7
99
64
100
97
97
June
0
0
0
0
0
July
0
0
0
0
0
August
92.3
86
94
93
87
97
September
91.0
81
84
89
95
97
October
86.1
81
77
90
94
86
November
82.5
70
74
84
95
December
0
0
0
0
Average
90.0
82.3
81.6
90.7
91.4
93.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-27.2
-25
-30
-28
-19
-32
February
-30.0
-25
-34
-30
-26
-32
March
-26.6
-23
-25
-24
-26
-26
April
-16.4
-12
-17
-16
-13
-15
May
-5.6
-5
-5
-7
-3
-3
June
5.2
4
3
5
7
6
July
10.3
10
10
12
8
13
August
9.1
9
10
9
7
9
September
2.2
6
3
3
1
1
October
-5.8
0
-4
-6
0
-3
November
-17.9
-9
-21
-14
-17
December
-20.0
-20
-14
-20
-17
Average
-10.7
-7.6
-10.3
-10.5
-8.0
-10.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-33.9
-30
-35
-33
-26
-37
February
-35.2
-30
-38
-35
-32
-36
March
-31.3
-29
-30
-29
-31
-32
April
-22.7
-17
-23
-22
-19
-21
May
-10.8
-10
-10
-12
-8
-9
June
0.8
0
-1
1
2
1
July
3.8
3
3
5
3
5
August
4.0
4
4
4
3
4
September
-2.3
2
-2
-1
-3
-3
October
-9.7
-4
-9
-11
-3
-7
November
-22.6
-15
-26
-19
-22
December
-27.9
-25
-23
-25
-25
Average
-15.7
-12.9
-15.1
-15.3
-14.9
-16.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
26.3
11
75
0
43
33
February
14.3
20
25
5
22
13
March
20.9
24
20
22
23
19
April
28.6
60
24
31
15
23
May
20.7
27
56
1
0
10
June
0
0
0
0
0
July
0
0
0
0
0
August
13.2
21
19
11
18
10
September
17.7
33
20
24
10
9
October
33.7
38
34
39
27
38
November
41.3
67
73
26
38
December
0
0
0
0
Average
21.3
34.8
25.7
23.7
17.6
18.1
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
4.8
6
5
6
7
5
February
4.9
5
5
5
5
5
March
5.0
4
4
6
6
6
April
4.8
6
4
5
5
4
May
4.5
5
5
4
3
5
June
0
0
0
0
0
July
0
0
0
0
0
August
6.3
8
7
7
8
7
September
6.2
5
6
7
6
7
October
7.2
8
8
7
6
8
November
7.9
8
9
9
10
December
0
0
0
0
Average
5.7
5.8
5.4
6.0
6.0
6.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
163°
186°
192°
192°
186°
February
162°
180°
176°
178°
187°
March
186°
188°
161°
187°
172°
April
202°
202°
202°
174°
195°
May
201°
198°
194°
186°
207°
June
360°
360°
360°
360°
360°
July
360°
360°
360°
360°
360°
August
237°
059°
134°
058°
227°
September
129°
178°
060°
233°
211°
October
099°
165°
162°
126°
121°
November
138°
192°
152°
204°
December
360°
360°
360°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.