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
99.6
100
100
100
99
100
February
99.8
100
100
100
99
100
March
99.4
99
100
98
99
100
April
97.7
100
99
96
96
May
94.4
97
98
93
97
June
93.9
91
94
89
96
July
96.7
92
98
97
98
August
95.1
96
96
94
95
September
91.6
90
94
91
92
October
90.8
92
89
91
93
November
92.6
81
93
92
99
December
99.3
99
99
100
100
Average
96.3
99.4
94.6
96.3
94.7
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
25.5
25.6
26.8
25.1
25.6
25.1
February
26.2
26.1
27.0
25.1
25.5
26.5
March
27.2
29.0
28.8
26.6
26.6
26.1
April
27.6
28.6
27.1
27.0
26.6
May
27.2
28.1
28.1
26.3
26.1
June
26.5
26.3
27.5
25.1
26.5
July
26.4
26.8
27.1
25.8
26.1
August
26.5
27.1
27.1
26.3
26.1
September
26.5
26.3
27.6
25.8
26.3
October
25.8
26.1
26.3
25.8
26.3
November
25.5
24.6
26.6
24.8
25.6
December
25.3
25.1
26.5
24.6
25.5
Average
26.4
26.9
26.8
26.7
25.8
26.0
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
18.6
19.5
19.5
18.5
18.0
18.0
February
18.5
19.3
18.8
18.5
17.8
18.3
March
18.7
19.0
19.6
18.5
18.1
18.3
April
19.6
20.3
19.1
19.3
19.3
May
20.0
20.3
20.6
19.3
19.8
June
19.4
19.5
19.8
18.5
19.3
July
19.8
20.1
20.6
19.3
19.6
August
19.6
20.1
20.3
19.1
18.8
September
19.0
19.6
20.1
18.3
19.0
October
18.9
19.3
19.6
18.5
19.1
November
19.3
18.8
20.0
18.8
19.1
December
19.2
19.8
20.0
18.8
19.3
Average
19.2
19.2
19.7
19.6
18.6
19.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.5
9
0
3
0
3
February
0.8
3
1
0
0
1
March
2.0
2
1
6
3
3
April
7.4
7
2
10
13
May
14.6
12
7
15
15
June
15.1
20
14
21
16
July
12.7
17
7
16
15
August
13.0
11
11
16
21
September
15.5
18
14
19
13
October
17.1
19
19
18
14
November
16.5
31
13
20
10
December
4.3
10
2
1
3
Average
9.6
4.5
12.3
8.3
12.1
10.4
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
13.1
12
13
13
13
14
February
13.9
13
13
16
14
13
March
13.3
12
11
11
13
14
April
10.5
11
11
9
10
May
7.8
7
10
6
9
June
7.1
6
7
6
7
July
8.8
7
9
8
8
August
8.0
8
8
8
7
September
6.5
6
8
6
7
October
6.2
7
6
7
7
November
7.9
7
7
7
10
December
11.6
11
12
12
13
Average
9.9
12.4
8.8
9.8
8.9
9.9
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
090°
088°
090°
090°
090°
February
088°
090°
088°
088°
091°
March
093°
090°
090°
088°
089°
April
089°
089°
091°
092°
May
081°
086°
315°
096°
June
301°
081°
309°
075°
July
082°
090°
091°
091°
August
082°
083°
069°
046°
September
305°
084°
301°
080°
October
075°
303°
070°
004°
November
313°
085°
080°
093°
December
094°
092°
092°
093°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.