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
99.5
100
100
100
98
February
96.4
100
98
100
100
85
March
96.6
100
97
95
100
92
April
99.3
100
99
100
98
May
99.2
100
100
100
97
100
June
99.8
100
100
100
100
100
July
99.3
100
100
99
August
99.0
100
100
97
September
98.2
100
99
96
October
98.1
100
98
97
November
99.9
100
100
100
December
100.0
100
100
100
Average
99.1
100.0
99.4
99.0
99.3
96.7
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
31.7
30.8
32.0
32.7
31.3
February
34.2
33.8
35.8
34.2
32.5
34.6
March
37.3
37.0
38.2
36.5
36.2
38.6
April
37.9
40.7
39.6
36.1
35.2
May
35.2
34.2
36.3
36.7
32.8
36.2
June
33.9
33.1
33.7
34.7
34.3
33.7
July
33.1
32.5
34.3
32.3
August
33.2
33.3
33.3
33.1
September
32.2
32.3
32.6
31.8
October
32.1
32.6
31.8
32.0
November
32.0
31.8
32.2
32.2
December
31.0
31.1
31.8
30.3
Average
33.5
33.7
34.2
34.3
34.1
33.4
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
17.9
16.0
19.8
18.8
16.8
February
20.6
21.1
21.3
20.1
20.6
20.0
March
24.3
24.5
24.6
22.6
24.3
25.3
April
26.5
28.8
27.6
25.0
24.8
May
26.4
25.8
27.5
27.0
25.3
26.6
June
26.3
26.1
26.3
26.6
25.8
26.5
July
26.0
26.3
26.1
25.5
August
26.0
26.0
26.3
25.8
September
25.4
25.8
25.6
24.6
October
24.5
24.8
24.3
24.5
November
22.6
22.5
22.8
23.0
December
19.0
19.8
20.6
17.5
Average
23.1
22.7
24.4
24.5
23.3
23.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.8
0
3
0
0
February
1.1
2
0
0
4
0
March
0.4
0
0
1
1
0
April
1.3
0
0
0
5
May
4.5
8
5
2
7
2
June
4.9
8
7
2
1
7
July
9.9
12
5
12
August
9.5
9
11
9
September
13.9
15
14
13
October
7.6
9
7
7
November
0.8
1
0
2
December
0.0
0
0
0
Average
3.3
3.5
5.0
3.9
2.2
4.7
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
0.0
0
0
0
0
February
0.5
3
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
0
June
0.0
0
0
0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
0
October
0.0
0
0
0
November
0.0
0
0
0
December
0.0
0
0
0
Average
0.0
0.5
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
360°
360°
360°
360°
February
137°
360°
360°
360°
360°
March
251°
360°
360°
360°
360°
April
360°
360°
360°
360°
May
360°
360°
360°
360°
360°
June
360°
360°
360°
360°
360°
July
360°
360°
360°
August
360°
360°
360°
September
360°
360°
360°
October
360°
360°
360°
November
360°
360°
360°
December
360°
360°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.