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
96.5
97
99
98
90
99
February
96.0
94
90
98
95
94
March
95.0
98
92
96
95
96
April
92.4
83
94
96
92
May
90.6
89
81
92
94
95
June
83.7
85
84
86
86
July
86.0
80
95
78
96
August
84.6
79
92
88
74
September
86.4
88
86
96
70
October
91.8
89
92
91
92
November
93.6
89
97
94
87
December
96.7
98
92
100
99
Average
91.9
94.6
88.2
93.1
91.9
90.3
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
27.6
27.5
26.6
28.8
28.6
27.1
February
27.5
29.6
28.0
28.8
25.8
26.0
March
25.5
26.3
24.6
28.5
23.8
25.0
April
22.3
21.1
22.0
21.6
23.6
May
18.5
19.8
15.5
19.6
17.0
17.8
June
16.0
16.6
16.8
13.5
15.1
July
15.1
13.5
16.8
15.5
16.0
August
16.6
15.1
18.3
16.1
16.3
September
18.3
20.0
17.6
18.0
18.1
October
20.4
22.3
20.3
19.6
21.5
November
24.0
24.8
23.3
24.6
23.5
December
25.7
24.3
24.6
27.3
25.8
Average
21.8
25.7
21.0
22.1
20.7
21.3
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
18.5
18.6
18.1
18.8
19.5
17.0
February
18.3
19.8
19.1
18.8
18.1
16.8
March
17.0
18.1
17.3
20.0
15.0
17.3
April
14.3
14.3
13.5
12.6
14.8
May
10.6
11.4
9.0
11.8
8.9
8.5
June
8.0
9.9
7.7
5.2
7.7
July
7.1
4.4
9.0
7.2
5.9
August
7.7
8.3
7.5
7.2
5.9
September
10.1
10.5
10.3
8.5
11.5
October
11.7
12.9
11.0
11.1
12.0
November
14.4
16.1
14.0
14.5
14.9
December
16.4
15.6
16.8
17.3
17.3
Average
13.2
16.9
12.9
13.2
11.9
12.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.2
7
3
4
10
12
February
10.2
6
8
9
18
22
March
10.1
14
8
7
15
10
April
12.3
21
9
6
10
May
12.1
10
13
12
11
14
June
12.5
12
6
8
17
July
9.4
4
5
10
8
August
9.0
15
3
2
8
September
10.2
4
13
3
17
October
10.8
9
11
17
6
November
7.9
12
7
5
10
December
8.3
13
14
5
1
Average
9.8
8.9
10.0
8.3
9.2
10.8
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
9.4
10
9
9
10
9
February
9.2
9
10
9
10
10
March
8.8
8
8
8
9
9
April
8.3
8
6
7
8
May
7.8
7
7
6
9
9
June
7.8
7
6
7
9
July
8.4
5
9
9
9
August
8.6
9
9
8
7
September
9.3
9
11
8
10
October
9.4
8
10
10
8
November
9.6
10
10
9
10
December
9.5
9
9
9
10
Average
8.9
8.4
8.4
8.6
8.9
9.0
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
130°
117°
135°
121°
137°
February
108°
124°
144°
172°
151°
March
133°
109°
130°
249°
139°
April
120°
136°
047°
083°
May
104°
190°
244°
199°
263°
June
080°
262°
248°
245°
July
207°
099°
105°
289°
August
158°
281°
157°
141°
September
111°
138°
134°
134°
October
123°
140°
152°
145°
November
119°
118°
118°
148°
December
160°
133°
135°
121°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.