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
93.0
96
97
93
90
92
February
90.2
93
90
86
94
91
March
91.8
94
91
89
92
April
91.6
95
91
93
92
May
92.9
91
92
92
97
June
97.6
95
98
98
99
July
98.8
98
100
99
98
August
99.8
100
100
100
100
September
99.9
100
100
100
100
October
99.9
100
100
100
100
November
98.6
100
96
98
99
December
97.5
98
98
100
96
Average
95.8
94.4
96.5
95.3
95.7
96.4
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
30.4
31.1
23.6
25.3
31.5
32.7
February
31.4
30.3
31.3
30.5
32.5
31.8
March
31.5
31.1
30.8
30.6
31.8
April
32.1
32.1
31.3
31.5
32.2
May
32.4
31.8
31.6
31.3
31.8
June
32.1
32.1
32.1
29.0
32.7
July
33.1
32.8
32.5
32.8
33.2
August
33.7
33.8
33.7
34.2
34.2
September
34.8
34.3
34.3
35.0
35.3
October
34.9
34.2
34.6
34.7
35.6
November
34.4
34.6
35.0
33.2
34.2
December
33.1
33.0
33.7
32.2
33.0
Average
32.6
30.6
32.1
32.1
32.4
33.2
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
21.7
24.3
16.3
16.1
23.3
24.5
February
23.3
24.1
24.8
23.1
24.6
22.6
March
23.4
25.3
23.3
22.6
22.0
April
24.0
25.5
24.1
23.8
24.8
May
24.1
25.5
25.0
24.6
20.8
June
23.6
24.8
24.0
19.0
25.0
July
23.7
24.6
24.6
24.1
24.1
August
23.5
25.3
24.3
24.6
25.3
September
24.9
25.8
25.8
24.3
25.8
October
25.3
25.3
26.0
24.1
26.3
November
25.0
25.5
26.3
24.5
25.1
December
23.9
24.8
25.8
23.8
24.8
Average
23.9
24.1
24.4
24.0
23.6
24.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
10.4
12
6
12
15
8
February
16.9
22
16
17
10
17
March
14.5
14
12
20
14
April
12.4
11
7
13
10
May
9.7
10
9
13
12
June
4.3
6
4
4
5
July
1.9
2
2
2
2
August
0.5
0
1
1
1
September
0.3
0
1
0
1
October
0.1
0
0
1
0
November
1.2
0
0
3
1
December
5.5
5
5
5
4
Average
7.5
16.7
5.7
5.7
7.4
6.0
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
7
7
6
6
7
February
6.5
7
7
6
7
7
March
6.4
6
7
6
6
April
6.1
6
7
6
6
May
5.8
6
6
5
6
June
5.7
6
6
5
6
July
5.8
6
7
5
5
August
7.2
7
7
7
7
September
8.8
9
9
8
8
October
9.5
10
10
9
9
November
8.7
10
10
7
8
December
8.0
9
8
7
7
Average
7.0
6.5
7.4
7.5
6.4
6.7
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
071°
076°
055°
044°
050°
February
078°
085°
061°
057°
046°
March
079°
044°
042°
050°
April
085°
055°
049°
050°
May
099°
071°
055°
057°
June
106°
077°
076°
065°
July
109°
075°
076°
069°
August
106°
098°
073°
060°
September
106°
099°
070°
063°
October
103°
100°
073°
062°
November
086°
096°
073°
057°
December
082°
087°
068°
053°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.