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
83.8
78
82
64
96
86
February
81.5
94
88
69
76
85
March
81.1
89
82
75
71
87
April
86.4
85
96
86
86
May
84.1
57
83
81
91
99
June
83.5
40
88
86
89
93
July
90.9
90
87
93
94
August
90.7
92
87
91
89
September
86.9
81
85
86
90
October
87.2
83
80
92
90
November
82.1
75
82
83
85
December
82.0
79
71
95
90
Average
83.5
66.6
83.6
79.1
87.0
89.1
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
27.3
27.5
26.8
29.0
27.0
26.5
February
27.1
26.6
28.1
27.3
27.1
26.3
March
26.4
26.8
29.8
27.5
26.3
21.5
April
23.4
24.6
23.1
20.8
25.6
May
23.2
24.6
27.1
21.6
21.8
23.1
June
21.1
20.6
21.6
20.3
20.8
20.3
July
21.6
21.0
20.6
21.3
20.6
August
22.0
25.1
24.3
20.6
21.0
September
23.5
21.3
24.1
22.8
22.8
October
24.4
24.1
23.0
23.6
23.8
November
24.7
24.1
27.3
23.1
23.6
December
25.3
26.5
24.1
26.5
24.1
Average
24.2
24.9
25.0
24.3
23.4
23.2
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
15.9
16.1
16.5
16.6
14.8
16.1
February
16.1
18.3
16.3
15.5
16.3
15.8
March
15.2
18.0
16.3
15.5
14.8
12.0
April
11.5
12.9
8.9
8.8
12.5
May
8.5
8.1
10.4
7.4
8.1
8.6
June
5.7
4.5
7.4
6.2
5.0
7.0
July
4.7
3.7
4.5
5.0
3.6
August
6.0
5.0
5.0
6.7
5.4
September
8.9
8.9
8.1
8.0
9.5
October
10.5
10.9
9.3
10.1
9.0
November
12.6
13.9
13.5
11.0
11.4
December
14.8
14.9
14.5
15.8
13.9
Average
10.9
12.0
11.4
10.4
10.2
10.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
9.7
13
11
12
6
12
February
8.4
3
3
13
7
7
March
7.0
11
4
6
8
3
April
7.5
6
0
18
9
May
2.7
1
1
10
5
1
June
1.4
2
2
3
1
5
July
0.4
0
0
2
0
August
1.9
0
0
4
2
September
6.5
12
7
11
9
October
8.6
10
15
8
4
November
9.5
11
5
15
9
December
10.7
9
16
9
12
Average
6.5
6.4
6.0
7.9
7.7
6.4
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
6.6
7
6
6
6
6
February
5.9
7
6
6
5
6
March
5.4
5
6
6
5
5
April
4.4
6
5
5
5
May
4.1
4
4
4
4
4
June
4.7
4
5
6
4
5
July
5.2
7
6
4
5
August
6.0
6
6
6
5
September
6.3
6
7
5
6
October
7.2
7
7
6
7
November
7.2
7
7
7
7
December
6.8
6
6
7
7
Average
5.8
5.2
6.2
5.9
5.3
5.8
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
154°
153°
151°
117°
114°
February
162°
152°
163°
114°
122°
March
127°
145°
151°
133°
108°
April
200°
172°
186°
138°
May
274°
100°
221°
209°
259°
June
289°
262°
299°
281°
261°
July
287°
267°
339°
246°
August
286°
199°
216°
188°
September
178°
186°
120°
124°
October
181°
177°
149°
135°
November
181°
162°
141°
117°
December
159°
154°
131°
124°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.