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
99.2
98
98
100
100
100
February
98.4
98
99
96
99
100
March
98.2
99
98
97
99
98
April
98.2
97
96
99
96
May
94.6
89
97
95
83
June
94.0
93
94
90
99
July
94.8
94
98
86
94
August
93.1
97
88
96
88
September
94.7
88
97
95
96
October
95.9
98
95
96
92
November
98.1
97
97
100
97
December
99.1
98
100
98
100
Average
97.1
98.2
95.9
96.5
96.7
95.9
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
13.6
15.5
14.0
15.0
11.8
13.9
February
14.0
11.8
15.0
13.5
13.1
15.5
March
12.1
12.0
11.0
10.5
13.0
12.5
April
9.7
8.9
8.5
10.5
12.0
May
7.5
5.5
9.3
9.0
6.7
June
4.2
1.3
4.7
5.9
5.5
July
4.6
5.2
4.5
3.7
5.2
August
5.6
6.0
4.7
6.5
6.2
September
7.4
6.9
6.4
9.0
9.3
October
9.7
10.6
9.3
10.1
10.5
November
12.2
12.0
10.5
14.5
12.0
December
13.0
13.3
12.4
13.1
14.1
Average
9.9
13.1
9.1
9.1
9.9
10.2
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
6.7
7.7
6.5
7.5
5.7
7.0
February
6.9
5.9
7.2
6.5
6.4
7.2
March
5.4
5.5
4.7
3.3
5.2
5.5
April
3.9
3.2
3.5
3.2
4.7
May
2.7
1.7
3.0
3.2
2.7
June
0.3
-3.3
0.1
1.1
1.6
July
0.4
0.4
0.1
-1.7
1.0
August
1.0
1.5
0.1
1.1
1.3
September
1.7
0.6
1.1
2.3
2.9
October
3.3
4.0
3.2
3.7
3.1
November
4.8
5.0
3.2
6.0
4.5
December
6.0
6.4
5.5
6.0
6.5
Average
3.9
6.4
3.2
3.0
3.5
4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
18.6
16
21
19
24
15
February
17.4
20
13
20
14
16
March
16.6
12
20
25
23
14
April
15.6
20
21
16
12
May
14.8
19
15
18
26
June
15.2
11
15
21
8
July
16.2
24
11
27
23
August
19.0
14
25
17
28
September
16.4
26
16
14
13
October
17.5
18
20
22
20
November
16.9
16
19
11
23
December
15.7
17
14
15
17
Average
16.7
15.8
18.3
18.4
18.3
17.8
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
13.7
12
14
12
17
11
February
13.1
15
12
12
15
14
March
11.4
12
12
12
11
14
April
11.2
11
11
11
9
May
10.5
11
10
12
11
June
9.4
7
9
12
9
July
9.4
10
9
10
9
August
10.8
9
10
8
10
September
11.4
13
11
11
10
October
14.1
13
15
13
15
November
13.2
12
12
12
14
December
14.2
12
16
13
15
Average
12.3
13.0
11.5
12.0
12.2
12.2
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
244°
242°
238°
225°
233°
February
243°
250°
243°
237°
234°
March
251°
245°
249°
236°
235°
April
248°
254°
232°
252°
May
248°
269°
239°
247°
June
256°
261°
260°
275°
July
247°
262°
262°
270°
August
258°
254°
255°
238°
September
259°
246°
264°
266°
October
242°
244°
242°
248°
November
243°
245°
250°
245°
December
244°
239°
244°
233°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.