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
2025
2024
2023
2022
2021
January
58.3
69
62
55
69
64
February
76.9
73
91
77
84
84
March
86.2
92
85
88
90
April
91.8
94
88
94
92
May
92.9
94
85
97
96
June
92.6
94
90
98
97
July
95.7
98
96
97
97
August
92.6
99
94
91
91
September
92.1
95
91
88
96
October
78.8
72
93
75
67
November
66.3
59
87
60
54
December
62.0
59
69
66
63
Average
82.8
71.1
86.3
85.6
86.4
85.1
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
2025
2024
2023
2022
2021
January
5.6
7.5
7.4
8.1
5.7
6.5
February
10.2
7.2
15.5
9.3
11.0
12.5
March
13.6
17.3
14.8
11.5
11.0
April
18.1
20.8
14.9
17.1
14.6
May
21.9
23.1
21.1
24.3
21.5
June
27.1
28.1
25.0
28.6
28.6
July
29.2
30.6
30.1
30.3
30.3
August
29.7
33.2
29.6
28.1
28.5
September
24.4
25.0
27.0
22.3
24.6
October
20.0
19.8
23.0
21.0
15.6
November
12.2
9.4
13.5
12.6
11.6
December
7.4
5.5
10.1
7.2
7.0
Average
17.1
7.3
19.6
18.9
18.7
17.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
-4.0
-2.1
-5.5
-1.8
-5.4
-3.7
February
-2.3
-3.2
1.1
-3.2
-2.3
-2.0
March
0.6
3.5
0.8
-3.2
-2.9
April
4.2
4.4
3.6
2.2
1.9
May
9.5
10.5
9.4
8.5
7.2
June
13.4
14.5
13.1
13.5
11.8
July
14.5
16.0
15.4
12.8
15.5
August
14.3
14.8
13.8
14.5
12.5
September
9.8
10.1
11.4
10.1
8.5
October
5.4
7.0
7.2
5.9
3.6
November
2.1
-1.5
1.3
2.6
2.3
December
-1.0
-2.8
-1.0
0.6
-1.5
Average
4.7
-3.6
6.3
6.0
5.3
4.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
19.0
9
13
29
12
26
February
14.0
15
7
14
11
8
March
12.2
7
9
9
17
April
11.1
5
16
6
16
May
8.5
6
15
4
8
June
6.7
6
9
2
2
July
3.4
2
2
2
3
August
3.4
1
3
6
7
September
6.0
15
3
9
2
October
7.8
8
4
2
21
November
14.6
9
18
17
18
December
17.5
18
10
22
17
Average
9.8
11.9
7.3
10.1
7.3
11.0
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
2025
2024
2023
2022
2021
January
3.2
3
4
4
4
4
February
3.9
3
4
4
4
4
March
4.6
5
5
4
4
April
4.7
5
4
5
4
May
4.4
4
5
4
5
June
4.0
4
3
4
4
July
4.0
4
4
5
4
August
3.8
4
4
4
4
September
4.0
5
4
3
4
October
3.3
3
3
3
4
November
3.4
3
4
3
3
December
3.6
3
4
3
4
Average
3.8
2.9
4.0
3.9
3.9
3.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
197°
282°
268°
294°
160°
February
128°
257°
304°
308°
310°
March
216°
290°
001°
296°
April
002°
303°
297°
307°
May
086°
081°
055°
309°
June
242°
312°
342°
332°
July
009°
353°
332°
061°
August
024°
087°
310°
022°
September
302°
068°
287°
015°
October
252°
233°
012°
081°
November
120°
281°
031°
243°
December
288°
197°
267°
275°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.