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
94.2
80
95
93
98
96
February
96.1
98
97
97
96
99
March
96.8
92
97
100
100
98
April
97.2
97
99
94
99
May
98.2
98
97
99
99
June
99.8
100
100
100
99
July
99.7
100
100
99
100
August
99.3
99
98
99
99
September
94.8
90
95
94
94
October
95.1
93
94
96
92
November
94.0
91
96
95
97
December
92.8
89
93
94
94
Average
95.5
86.9
95.1
96.6
96.9
96.9
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
27.1
27.6
26.6
27.6
27.5
26.8
February
27.2
26.8
26.8
28.1
27.3
27.1
March
26.9
26.8
27.6
27.3
27.0
26.5
April
25.1
25.3
25.8
23.8
25.6
May
24.2
25.1
23.6
23.3
24.1
June
23.2
23.3
23.1
22.5
23.3
July
22.6
23.1
22.5
22.8
21.1
August
22.6
24.1
22.3
22.1
22.0
September
22.9
21.6
23.6
24.1
22.6
October
23.3
23.1
22.6
25.1
22.3
November
24.4
24.6
25.1
24.5
23.8
December
25.7
27.1
24.8
26.1
25.5
Average
24.9
27.2
24.9
24.7
24.6
24.2
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
20.0
21.1
19.5
20.1
20.3
20.6
February
20.5
22.1
20.1
21.1
20.8
20.0
March
19.5
20.6
19.3
20.3
19.0
19.1
April
16.9
17.0
16.3
16.1
17.1
May
13.6
14.6
14.4
13.0
13.1
June
10.2
10.5
11.0
8.9
10.4
July
9.0
8.5
9.6
9.9
7.5
August
11.4
12.0
11.0
10.5
10.8
September
14.1
14.5
13.9
14.8
13.9
October
15.7
15.5
15.5
18.0
14.3
November
17.5
18.6
18.3
16.8
17.0
December
19.6
21.1
19.1
20.3
19.3
Average
16.2
20.9
15.9
15.9
15.5
15.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
9.0
23
11
9
4
11
February
8.0
4
5
9
7
4
March
5.9
14
5
3
3
2
April
6.4
4
2
17
5
May
4.2
0
8
7
3
June
0.8
0
1
1
2
July
0.7
1
2
0
1
August
2.1
1
3
2
4
September
8.0
18
8
6
9
October
8.9
8
14
6
11
November
8.6
11
4
10
6
December
10.4
13
16
9
9
Average
7.3
17.0
6.8
6.6
5.9
5.7
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
9.1
9
8
9
9
9
February
8.5
8
9
8
7
8
March
8.3
8
9
9
8
8
April
7.6
8
7
7
7
May
6.8
6
7
7
7
June
6.4
7
6
6
7
July
6.9
7
7
7
7
August
8.7
9
8
8
9
September
8.9
8
9
9
10
October
9.5
9
9
9
9
November
9.0
9
8
9
10
December
8.5
8
8
9
8
Average
8.3
8.2
8.2
8.0
7.9
8.2
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
121°
081°
051°
066°
097°
February
153°
063°
088°
078°
127°
March
051°
061°
079°
059°
083°
April
095°
117°
165°
141°
May
116°
147°
158°
097°
June
081°
121°
097°
135°
July
151°
143°
116°
105°
August
089°
068°
153°
140°
September
141°
105°
116°
111°
October
131°
139°
115°
079°
November
130°
075°
089°
100°
December
107°
099°
061°
093°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.