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
71.1
66
86
75
82
80
February
85.6
85
96
91
84
86
March
93.7
95
99
96
93
92
April
96.2
95
96
97
97
May
95.7
98
95
94
98
98
June
93.8
96
88
95
98
July
97.3
99
96
100
98
August
95.0
100
93
94
96
September
94.8
96
91
90
97
October
85.1
87
91
82
85
November
78.0
74
86
76
76
December
77.9
83
88
77
77
Average
89.9
87.9
93.0
90.9
90.8
91.3
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
5.1
6.5
6.7
7.7
5.9
6.7
February
9.8
6.4
15.3
9.0
10.4
12.0
March
14.0
16.5
16.8
14.4
11.5
11.1
April
18.4
20.8
14.9
18.0
15.9
May
22.4
21.5
22.5
20.8
25.3
23.1
June
27.6
29.8
24.8
29.0
28.8
July
29.9
32.2
30.3
31.5
31.5
August
30.4
33.5
29.3
30.0
29.5
September
25.1
25.6
26.6
22.8
25.1
October
20.2
20.1
22.6
20.1
16.6
November
12.2
10.6
12.5
12.8
12.1
December
7.5
6.5
10.0
8.5
7.0
Average
18.0
12.9
20.0
18.6
19.1
18.3
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
-5.8
-3.9
-4.7
0.2
-6.9
-2.8
February
-2.3
-4.0
0.6
-3.6
-1.1
-2.1
March
0.9
3.2
3.7
0.9
-3.5
-2.8
April
4.2
4.9
3.3
3.7
3.0
May
9.2
7.9
10.5
9.6
8.6
9.3
June
14.3
15.0
14.3
14.8
12.5
July
15.5
16.1
16.6
14.8
17.1
August
15.1
15.5
14.9
17.1
13.6
September
10.7
10.9
12.3
11.6
9.5
October
5.5
5.5
7.0
6.0
3.7
November
2.1
-1.0
2.1
3.3
2.2
December
-1.5
-1.5
-1.5
1.1
0.2
Average
5.5
1.4
6.5
6.5
6.2
5.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
15.3
5
13
22
16
16
February
11.7
13
4
9
17
7
March
10.2
8
6
12
9
16
April
8.7
6
14
7
10
May
6.2
4
7
11
3
6
June
4.7
3
10
1
2
July
2.5
2
2
1
2
August
2.0
1
1
4
2
September
4.7
9
3
9
4
October
4.4
4
0
1
10
November
10.9
12
18
10
9
December
12.6
14
6
10
21
Average
7.3
7.3
6.1
8.5
6.5
7.8
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
3.1
2
3
4
3
4
February
4.2
4
4
4
4
4
March
4.5
4
5
4
4
5
April
4.4
4
5
5
4
May
4.1
3
5
5
3
4
June
3.4
3
3
4
4
July
3.4
3
3
4
4
August
3.1
3
3
3
4
September
3.3
3
3
3
3
October
3.0
3
3
2
4
November
3.8
2
4
3
5
December
3.9
3
3
5
4
Average
3.7
3.5
3.5
3.4
3.7
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
299°
309°
206°
304°
161°
February
154°
160°
307°
312°
300°
March
252°
151°
317°
324°
308°
April
026°
317°
303°
320°
May
332°
116°
113°
043°
263°
June
139°
310°
010°
319°
July
001°
329°
316°
062°
August
002°
071°
325°
357°
September
137°
081°
209°
029°
October
144°
243°
277°
127°
November
135°
210°
164°
139°
December
291°
228°
143°
299°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.