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
95.5
97
92
87
92
100
February
97.2
100
97
98
97
98
March
96.6
97
92
99
99
100
April
96.6
98
93
95
99
May
94.8
98
95
92
98
93
June
93.6
97
95
96
85
97
July
93.6
89
97
92
94
August
92.0
97
83
95
93
September
93.7
96
98
89
96
October
94.8
94
94
98
88
November
94.6
93
97
94
94
December
95.9
94
97
97
97
Average
95.2
97.9
94.2
94.2
94.2
95.8
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
32.1
31.8
31.0
30.8
31.1
33.0
February
31.7
35.0
31.8
33.1
30.3
30.3
March
31.1
31.6
30.6
32.0
33.2
31.8
April
28.8
30.6
28.1
28.8
28.0
May
27.4
27.5
30.3
26.6
26.8
26.8
June
26.8
27.1
29.3
26.8
24.6
25.5
July
26.4
25.8
26.5
28.1
24.3
August
26.4
28.1
27.5
25.8
26.6
September
28.6
30.6
30.5
25.6
27.8
October
28.4
28.8
28.6
28.3
25.8
November
28.7
29.5
31.3
27.3
27.3
December
30.4
30.6
31.6
29.6
29.3
Average
29.0
30.5
29.7
29.4
28.3
28.0
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
23.8
23.8
23.6
22.8
23.8
24.1
February
23.5
24.8
24.3
23.8
23.3
23.3
March
23.0
24.1
23.6
23.3
23.6
23.6
April
21.3
22.0
21.1
21.5
20.5
May
19.4
19.3
21.3
18.8
18.6
19.1
June
18.0
17.1
18.0
17.1
16.8
17.8
July
17.1
18.1
16.8
17.5
15.0
August
17.5
16.8
18.6
17.1
17.1
September
19.8
20.3
20.5
17.3
20.0
October
20.9
21.1
21.6
20.5
20.1
November
21.2
21.3
23.0
20.1
19.8
December
22.6
23.0
23.5
21.8
21.8
Average
20.8
21.8
21.1
20.9
20.1
20.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.3
5
11
13
10
1
February
4.0
1
3
2
4
3
March
4.1
4
9
1
2
1
April
4.0
0
8
6
4
May
4.0
2
7
7
3
3
June
2.8
3
3
0
7
2
July
2.5
6
2
1
2
August
6.2
3
13
6
4
September
4.8
1
1
13
0
October
7.3
8
9
4
14
November
8.0
12
4
8
10
December
7.5
10
3
9
12
Average
5.0
3.0
6.3
5.3
6.0
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
7.0
7
7
7
7
7
February
6.9
7
8
7
7
7
March
6.8
8
7
7
7
7
April
6.4
7
6
7
7
May
5.7
6
6
5
6
6
June
5.2
6
5
5
5
6
July
5.7
5
6
5
6
August
6.3
6
6
7
6
September
6.9
7
7
7
7
October
7.3
8
7
7
8
November
7.5
7
7
8
8
December
7.5
7
8
8
8
Average
6.6
6.7
6.7
6.6
6.8
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
109°
128°
110°
107°
112°
February
104°
116°
101°
114°
109°
March
120°
135°
104°
109°
125°
April
108°
133°
124°
183°
May
079°
041°
098°
197°
101°
June
271°
059°
041°
182°
169°
July
194°
061°
085°
173°
August
078°
105°
160°
118°
September
127°
105°
155°
134°
October
131°
131°
132°
126°
November
129°
149°
144°
131°
December
114°
126°
116°
130°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.