Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
77.1
75
81
83
82
70
February
75.0
78
82
79
76
84
March
80.5
85
77
93
81
79
April
85.8
84
92
85
83
87
May
93.0
95
95
99
88
86
June
95.4
91
94
94
100
100
July
94.7
98
91
93
98
92
August
95.3
90
93
94
97
99
September
95.4
96
94
91
99
October
87.6
94
92
72
88
November
80.3
89
72
90
78
December
75.2
86
62
58
77
Average
89.1
89.6
90.4
90.6
88.4
89.5
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km 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
-17.5
-15
-17
-18
-20
-16
February
-16.8
-16
-20
-17
-19
-23
March
-12.8
-16
-12
-10
-15
-8
April
-7.9
-7
-10
-3
-7
-9
May
3.1
1
3
7
4
3
June
13.4
11
13
13
13
16
July
16.1
17
17
14
15
16
August
14.1
12
14
15
14
15
September
8.6
8
8
6
9
October
-1.2
2
-2
-5
1
November
-7.7
-4
-7
-13
-3
December
-16.9
-18
-4
-14
-13
Average
-2.4
-2.4
-3.9
-1.7
-4.5
-1.1
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
-24.6
-23
-23
-27
-27
-22
February
-23.6
-24
-27
-24
-27
-29
March
-20.8
-23
-21
-18
-24
-16
April
-14.9
-14
-18
-9
-14
-16
May
-4.6
-5
-6
-1
-3
-3
June
4.6
2
4
5
4
5
July
8.6
9
9
7
8
9
August
6.4
4
7
7
5
7
September
2.2
2
2
-1
2
October
-7.6
-3
-9
-11
-4
November
-14.5
-11
-15
-20
-10
December
-23.8
-24
-14
-24
-19
Average
-9.3
-10.8
-10.8
-8.3
-12.9
-9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
44.3
46
45
36
45
52
February
44.1
65
34
40
42
29
March
45.1
48
56
30
51
35
April
24.6
36
25
35
34
23
May
10.4
17
6
3
17
7
June
7.9
16
8
12
5
6
July
13.8
8
15
17
24
18
August
14.0
22
17
13
10
12
September
17.7
21
30
21
12
October
26.3
30
12
46
27
November
33.5
33
40
38
42
December
44.6
30
68
69
43
Average
22.3
25.7
22.2
21.7
27.0
19.9
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
11.0
10
13
8
10
12
February
12.4
13
10
12
13
9
March
12.2
10
14
9
12
13
April
10.6
11
9
12
10
9
May
9.0
10
8
9
10
10
June
10.1
10
11
11
9
9
July
10.2
13
9
10
9
9
August
9.4
11
10
10
10
9
September
9.3
10
10
9
9
October
9.8
9
8
9
9
November
12.0
12
12
9
12
December
12.7
12
19
14
11
Average
10.4
10.9
10.2
10.1
10.1
9.8
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
003°
045°
029°
016°
058°
February
015°
011°
029°
038°
004°
March
006°
346°
046°
001°
094°
April
012°
013°
071°
032°
345°
May
021°
327°
188°
084°
091°
June
128°
133°
135°
143°
171°
July
101°
128°
120°
097°
128°
August
008°
081°
149°
111°
142°
September
002°
004°
352°
044°
October
065°
335°
017°
027°
November
056°
071°
035°
059°
December
353°
079°
016°
034°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.