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
81.4
75
91
82
95
91
February
88.0
80
98
99
99
88
March
95.0
95
97
94
100
99
April
96.1
97
99
95
93
May
96.4
97
96
89
99
95
June
98.7
99
97
100
100
July
98.8
99
98
100
100
August
98.6
100
97
100
99
September
96.4
94
97
95
100
October
92.4
84
97
91
91
November
77.9
74
97
73
75
December
78.9
87
85
38
82
Average
92.5
88.4
93.9
94.5
93.4
93.7
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
5.3
7.2
6.2
7.0
6.5
4.9
February
9.0
5.2
13.4
8.9
10.5
10.5
March
12.8
13.9
14.3
13.3
11.6
12.1
April
16.7
18.6
14.0
14.8
13.6
May
20.3
20.1
21.1
19.1
22.6
18.1
June
26.4
25.6
25.3
27.0
28.1
July
27.8
28.8
27.3
28.8
28.1
August
27.5
29.6
26.8
28.1
25.1
September
22.1
22.0
24.8
20.6
22.8
October
17.9
17.1
20.3
19.5
14.8
November
9.9
9.1
11.5
11.0
8.3
December
5.9
6.7
7.5
2.2
4.9
Average
16.3
11.7
17.7
17.2
17.4
16.0
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
-3.1
-1.7
-5.9
0.0
-4.5
-2.1
February
-2.8
-3.7
1.9
-3.2
-1.0
-2.5
March
1.2
3.2
4.4
1.1
-3.7
-1.6
April
4.8
5.2
4.0
4.0
2.7
May
9.9
9.0
10.5
10.3
11.3
7.9
June
14.7
15.0
14.0
16.0
14.9
July
15.3
17.1
16.0
15.5
16.5
August
15.7
17.0
15.5
16.3
13.8
September
11.0
12.0
12.8
10.4
9.5
October
7.1
9.0
9.4
7.7
4.5
November
2.4
-1.9
1.7
3.5
1.9
December
-2.4
-2.3
-2.5
-2.6
-3.7
Average
6.0
2.5
7.2
6.7
6.6
5.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.9
5
9
20
3
11
February
8.9
10
5
3
5
7
March
8.0
16
9
7
4
6
April
9.2
8
14
12
12
May
12.2
9
13
21
10
15
June
5.3
6
7
5
2
July
5.1
4
6
4
4
August
4.7
3
9
5
5
September
9.9
19
7
14
5
October
6.8
9
7
3
8
November
11.9
6
11
13
13
December
10.1
2
13
27
9
Average
8.3
10.1
7.6
10.3
7.8
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
5.2
7
5
6
4
5
February
6.0
4
6
6
8
6
March
6.3
7
6
8
6
6
April
6.3
7
6
7
6
May
5.6
4
5
5
5
7
June
5.1
5
4
5
5
July
4.6
4
5
4
6
August
4.2
4
5
4
4
September
4.6
6
5
4
4
October
5.2
5
6
4
6
November
4.6
4
5
5
4
December
4.5
5
4
3
4
Average
5.2
5.3
5.1
5.3
5.0
5.3
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
206°
178°
256°
177°
205°
February
083°
201°
188°
211°
182°
March
205°
185°
213°
102°
038°
April
205°
018°
155°
224°
May
097°
205°
021°
158°
205°
June
195°
041°
088°
157°
July
086°
185°
097°
184°
August
109°
149°
027°
154°
September
333°
163°
199°
143°
October
194°
191°
174°
203°
November
173°
192°
055°
168°
December
012°
202°
088°
208°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.