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
95.3
97
84
99
99
97
February
91.7
61
99
99
98
March
85.5
45
67
98
91
April
93.5
73
98
97
100
May
99.4
100
99
100
100
June
98.2
85
100
98
100
July
94.0
71
85
100
97
August
90.1
64
58
98
99
September
97.7
85
96
98
98
October
98.7
99
99
99
100
November
96.6
93
99
98
98
December
96.0
93
94
98
99
Average
95.0
97.3
78.9
91.5
98.6
98.5
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
25.2
25.8
24.8
22.8
25.1
27.1
February
26.0
26.3
25.6
24.6
27.1
March
24.3
26.5
7.2
24.8
24.6
April
25.6
26.1
25.1
24.3
25.1
May
26.0
26.5
26.8
25.0
24.8
June
25.0
25.3
25.6
23.6
25.5
July
25.3
26.8
25.5
23.8
24.6
August
27.6
28.3
28.3
24.3
27.3
September
29.1
28.8
29.8
28.0
29.6
October
28.1
29.1
28.1
27.1
28.3
November
25.6
24.8
24.6
25.8
25.6
December
25.1
24.6
24.5
24.6
25.1
Average
26.1
25.9
26.4
25.1
25.1
26.5
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
16.5
15.5
16.5
18.0
18.3
18.3
February
16.7
12.6
19.5
18.6
18.1
March
15.5
17.0
3.7
18.0
17.0
April
16.3
15.5
14.5
17.1
18.6
May
14.3
11.4
14.3
15.5
15.9
June
11.7
11.1
11.3
13.5
13.6
July
11.9
11.4
11.4
15.8
12.5
August
14.1
12.5
12.8
17.1
16.6
September
16.5
13.0
15.5
18.8
18.6
October
16.9
14.6
16.6
18.8
18.8
November
16.1
8.1
15.9
19.1
18.0
December
16.5
12.0
16.6
18.3
17.6
Average
15.3
15.4
13.0
14.4
17.4
17.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
5.9
3
1
10
5
0
February
4.1
2
2
6
0
March
4.4
2
0
4
4
April
3.6
3
1
3
2
May
0.5
0
1
0
4
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.5
0
2
0
2
October
3.7
2
1
3
1
November
6.3
3
7
4
5
December
8.7
7
4
5
6
Average
3.0
2.6
1.7
2.3
2.3
1.7
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
5.0
6
5
5
5
5
February
4.8
5
4
5
5
March
4.8
5
5
4
3
April
5.6
6
7
5
6
May
5.1
6
5
4
5
June
5.1
6
5
5
3
July
5.5
5
6
3
6
August
5.9
7
6
5
4
September
5.4
5
6
6
5
October
5.7
7
6
4
6
November
4.9
5
5
5
4
December
4.9
5
5
6
4
Average
5.2
5.5
5.4
5.4
4.7
4.7
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
274°
248°
254°
211°
254°
February
059°
168°
185°
245°
March
102°
355°
095°
181°
April
093°
092°
080°
067°
May
092°
052°
091°
080°
June
073°
071°
069°
077°
July
117°
098°
080°
080°
August
102°
090°
082°
105°
September
127°
096°
069°
101°
October
102°
054°
076°
113°
November
219°
004°
133°
142°
December
008°
282°
225°
089°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.