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
75.0
65
82
85
79
80
February
79.2
81
78
86
80
81
March
88.4
82
93
97
91
90
April
92.0
84
93
93
99
93
May
94.1
95
90
94
96
92
June
98.1
96
98
99
99
98
July
95.6
99
92
97
97
95
August
93.2
87
97
97
97
90
September
90.4
96
81
91
88
94
October
81.1
84
87
74
76
81
November
61.6
57
54
64
72
December
72.2
80
79
75
79
Average
88.4
89.1
88.5
90.6
90.2
89.6
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
-10.3
-13
-9
-10
-12
-6
February
-8.2
-9
-7
-3
-17
-3
March
-1.2
0
0
-2
-2
2
April
6.6
7
8
7
10
5
May
13.8
10
17
12
18
15
June
19.7
22
18
20
23
18
July
23.4
24
23
25
23
25
August
19.7
20
22
24
21
18
September
13.4
18
17
11
10
14
October
5.2
6
5
6
5
6
November
-3.4
-3
-5
-1
-2
December
-8.4
-11
-9
-12
-8
Average
6.0
8.5
6.7
6.8
5.4
7.1
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
-16.3
-19
-14
-17
-18
-11
February
-15.3
-15
-14
-8
-26
-9
March
-10.4
-8
-10
-13
-11
-6
April
-3.3
-1
-3
-4
-1
-4
May
3.2
0
5
3
5
5
June
8.8
12
7
9
11
8
July
12.4
13
13
13
11
14
August
9.9
11
11
12
10
10
September
4.9
7
9
3
2
5
October
0.4
0
1
3
-1
1
November
-7.0
-7
-9
-7
-5
December
-13.4
-16
-13
-18
-14
Average
-2.0
0.0
-2.6
-2.5
-4.5
-1.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
53.2
48
45
63
43
51
February
44.8
40
48
52
29
44
March
30.4
36
27
17
31
27
April
16.6
22
11
10
9
21
May
15.0
18
11
19
11
17
June
8.4
9
7
11
4
6
July
6.9
4
8
2
6
4
August
9.1
7
9
6
6
8
September
13.3
5
8
10
19
21
October
27.0
11
35
25
27
19
November
44.1
51
39
50
41
December
49.1
40
49
60
43
Average
21.2
16.5
19.0
18.4
18.2
19.7
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
6.7
6
8
7
6
6
February
6.8
8
6
9
6
7
March
7.0
7
8
7
8
7
April
7.0
8
7
7
8
7
May
6.7
7
6
8
7
6
June
5.6
6
6
6
5
6
July
5.3
5
6
5
5
6
August
5.1
5
4
5
5
5
September
5.8
6
6
7
6
6
October
6.5
7
7
7
6
6
November
6.2
6
5
8
7
December
6.2
6
6
7
7
Average
6.2
6.2
6.3
6.3
6.3
6.0
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
204°
213°
201°
116°
217°
February
189°
210°
196°
037°
187°
March
244°
205°
256°
217°
221°
April
187°
013°
244°
189°
214°
May
320°
218°
269°
210°
096°
June
275°
312°
013°
250°
331°
July
023°
155°
173°
327°
136°
August
010°
317°
231°
202°
317°
September
236°
228°
145°
039°
203°
October
213°
223°
216°
209°
197°
November
199°
320°
198°
197°
December
161°
184°
188°
195°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.