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
66.5
69
62
70
53
77
February
74.9
69
82
81
71
87
March
88.6
91
78
95
87
91
April
92.6
86
95
92
92
98
May
96.4
99
99
97
91
98
June
98.0
98
99
99
100
95
July
95.4
92
97
98
100
98
August
95.6
88
98
96
94
97
September
92.8
93
97
88
95
97
October
84.7
79
87
87
91
80
November
68.0
62
67
58
65
80
December
59.5
54
63
67
57
Average
88.8
87.3
89.2
90.0
88.1
91.2
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
-3.7
-7
-1
-2
-4
3
February
-2.2
-2
-1
0
-7
2
March
2.8
6
2
3
2
5
April
9.1
10
12
8
9
7
May
15.9
18
17
14
16
14
June
21.8
23
22
21
25
23
July
22.9
25
22
24
27
21
August
21.9
22
24
25
20
21
September
16.4
21
20
13
13
17
October
9.3
11
8
10
10
11
November
3.3
4
2
2
4
6
December
-2.5
-4
-3
-5
0
Average
10.1
11.9
10.1
10.0
9.2
10.8
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
-8.9
-13
-5
-8
-7
-1
February
-7.2
-7
-6
-4
-14
-2
March
-5.8
-1
-5
-5
-6
-2
April
0.2
2
1
-1
1
0
May
5.5
7
5
5
7
3
June
11.5
12
10
11
15
13
July
13.6
15
13
14
16
13
August
12.8
13
14
14
12
12
September
8.6
11
10
6
7
9
October
3.6
4
2
5
4
5
November
-1.5
0
-2
-2
0
1
December
-6.8
-7
-8
-12
-3
Average
2.8
3.8
2.5
2.6
1.9
4.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
36.0
40
45
38
36
15
February
32.6
24
34
31
48
21
March
18.3
10
33
11
18
14
April
14.2
18
8
15
15
14
May
7.7
4
4
6
17
9
June
6.4
9
4
8
2
5
July
9.0
15
8
7
3
10
August
9.4
12
6
8
13
10
September
10.0
6
4
17
14
5
October
15.8
17
18
15
7
16
November
24.2
30
40
32
29
15
December
38.6
54
46
47
25
Average
14.9
14.4
16.1
14.8
16.3
11.7
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
8.8
8
10
9
6
12
February
9.2
9
9
10
8
12
March
9.3
8
9
9
10
10
April
8.8
10
8
9
9
10
May
8.1
7
9
10
8
8
June
7.8
8
7
7
7
7
July
7.5
7
9
7
8
8
August
7.4
6
8
7
9
6
September
8.3
7
8
7
10
9
October
8.7
8
10
9
10
6
November
8.8
9
7
9
10
8
December
8.5
8
8
9
8
Average
8.3
7.7
8.5
8.2
8.5
8.4
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
224°
201°
266°
108°
250°
February
173°
244°
219°
294°
238°
March
211°
250°
285°
252°
252°
April
277°
036°
332°
276°
290°
May
344°
295°
298°
160°
326°
June
288°
311°
293°
276°
068°
July
223°
272°
264°
276°
257°
August
254°
134°
174°
187°
286°
September
165°
219°
334°
318°
243°
October
259°
258°
247°
218°
161°
November
243°
113°
128°
255°
216°
December
132°
140°
261°
151°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.