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
99
100
100
February
99.3
99
99
99
100
March
99.4
99
100
99
99
April
99.5
99
99
99
100
May
99.3
99
99
99
100
June
98.7
100
99
99
96
July
98.4
99
99
99
97
August
98.0
99
100
99
94
September
98.6
99
99
98
99
October
99.1
99
100
99
100
November
99.3
100
100
99
99
December
99.1
100
99
100
99
Average
99.1
100.0
99.3
99.3
99.1
98.4
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
30.6
30.8
31.0
29.8
30.8
29.8
February
31.3
32.6
31.5
32.0
30.8
March
33.0
33.1
32.7
33.7
33.1
April
34.1
35.7
33.7
33.0
33.2
May
34.8
35.6
33.8
34.1
35.7
June
33.2
33.8
32.7
33.3
32.6
July
31.9
32.3
32.2
32.6
31.3
August
31.4
32.5
31.5
31.3
32.3
September
31.6
31.3
31.8
31.5
31.8
October
31.8
32.0
31.8
32.0
31.8
November
32.0
32.5
32.5
31.8
32.6
December
31.0
30.8
32.0
31.1
30.8
Average
32.1
30.9
32.7
32.1
32.3
32.2
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
24.1
24.3
23.1
24.5
23.5
24.3
February
23.3
24.8
21.8
24.1
23.3
March
24.6
24.6
22.8
26.1
24.6
April
26.2
27.0
25.6
25.3
26.3
May
26.9
28.1
27.6
25.8
27.3
June
26.1
26.6
25.3
24.8
26.8
July
24.5
24.6
24.5
26.3
23.5
August
24.9
25.8
24.3
25.6
25.3
September
25.1
24.8
22.8
25.6
25.1
October
25.1
26.5
25.3
24.8
24.1
November
24.4
24.6
25.1
25.0
23.5
December
24.7
25.8
23.1
25.8
23.6
Average
24.9
24.3
25.5
24.4
25.2
24.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.5
3
1
9
1
10
February
3.2
0
3
3
8
March
1.1
1
2
1
3
April
1.8
0
3
5
1
May
3.7
6
2
8
0
June
8.1
6
7
5
6
July
16.2
18
14
11
29
August
12.4
7
11
15
7
September
13.5
16
14
13
15
October
10.9
10
7
13
17
November
7.3
7
4
8
5
December
10.7
14
4
13
6
Average
7.2
2.5
7.1
6.6
7.8
8.8
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
6.7
6
7
7
7
6
February
7.4
8
7
7
6
March
7.6
7
7
7
7
April
7.9
8
6
7
8
May
7.8
8
8
6
8
June
7.3
7
7
6
8
July
7.2
7
7
6
8
August
8.9
8
12
6
8
September
7.6
8
7
9
6
October
6.3
7
6
7
6
November
6.2
6
6
6
5
December
5.8
5
6
6
6
Average
7.1
5.7
7.1
7.2
6.6
6.9
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
105°
099°
079°
099°
082°
February
111°
098°
109°
089°
March
114°
120°
118°
101°
April
122°
153°
109°
195°
May
132°
252°
138°
123°
June
239°
251°
246°
265°
July
224°
239°
256°
256°
August
265°
258°
265°
256°
September
255°
262°
257°
263°
October
264°
253°
234°
232°
November
152°
089°
109°
092°
December
096°
102°
081°
082°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.