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
97.0
98
85
100
99
98
February
95.2
97
93
99
99
98
March
98.0
99
97
95
98
99
April
94.3
72
98
97
97
May
97.0
90
98
98
97
99
June
98.1
99
97
99
99
July
97.9
98
97
98
98
August
95.8
84
96
98
99
September
89.5
48
98
96
98
October
91.0
59
96
90
92
November
95.6
96
98
97
99
December
97.4
98
98
99
96
Average
95.6
95.5
85.3
97.3
97.2
97.6
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
28.5
29.3
28.8
28.1
28.6
28.6
February
28.4
28.8
29.0
27.8
28.3
28.3
March
28.9
29.8
29.6
28.8
28.6
28.8
April
29.4
30.3
29.5
29.3
29.3
May
30.2
30.1
31.1
30.5
29.8
30.3
June
30.8
31.6
31.3
30.6
30.6
July
31.0
31.6
31.3
30.5
31.0
August
31.3
31.8
32.0
31.0
31.3
September
31.3
31.5
32.5
30.6
31.3
October
30.8
31.8
31.1
30.3
30.6
November
30.0
30.8
30.6
29.6
30.1
December
29.1
29.6
29.5
28.6
29.0
Average
29.9
29.5
30.6
30.2
29.7
29.9
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
21.0
21.6
22.3
20.8
20.3
20.3
February
21.1
21.8
22.0
20.6
20.6
20.3
March
21.6
22.1
22.5
20.8
22.1
21.3
April
22.3
23.3
22.1
21.1
22.3
May
23.9
24.3
25.0
23.8
23.0
23.5
June
24.5
25.6
25.1
24.5
24.5
July
24.5
24.8
24.5
24.5
24.6
August
24.6
25.1
24.6
24.5
24.0
September
24.0
24.0
23.1
23.3
24.1
October
24.0
24.3
25.0
23.6
24.0
November
23.1
24.0
23.8
23.1
22.5
December
21.9
22.5
21.5
20.3
22.1
Average
23.0
22.5
23.8
23.0
22.7
22.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
43.0
49
40
44
20
50
February
47.0
56
44
39
51
49
March
41.1
41
40
29
48
31
April
36.3
33
46
32
31
May
36.9
43
45
36
29
26
June
35.8
51
41
20
39
July
44.2
55
44
39
32
August
42.7
55
51
32
32
September
42.6
25
48
43
35
October
44.2
32
47
51
32
November
47.9
48
47
40
40
December
44.6
40
50
20
57
Average
42.3
46.5
42.4
43.4
35.7
37.2
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
9.0
8
10
9
9
9
February
10.0
10
9
10
9
11
March
10.1
9
9
9
12
10
April
9.6
9
9
10
9
May
10.3
9
10
10
10
11
June
10.5
10
10
11
11
July
10.3
10
9
10
11
August
8.9
9
8
8
9
September
7.6
7
7
8
7
October
7.8
7
8
8
9
November
8.1
7
9
9
7
December
8.5
8
8
7
10
Average
9.3
9.1
8.5
9.0
9.4
9.6
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
088°
095°
093°
094°
092°
February
094°
118°
084°
089°
092°
March
117°
103°
095°
093°
097°
April
108°
112°
102°
114°
May
106°
126°
124°
108°
112°
June
115°
114°
105°
103°
July
100°
091°
096°
099°
August
105°
101°
096°
094°
September
114°
118°
116°
120°
October
116°
131°
111°
114°
November
121°
110°
104°
099°
December
096°
082°
049°
088°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.