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
78.3
70
87
88
75
88
February
82.8
87
81
84
90
82
March
87.4
85
85
96
86
April
92.9
96
90
97
96
May
91.1
81
88
97
98
June
93.5
94
99
98
86
July
94.6
98
92
99
90
August
95.8
95
95
99
95
September
93.3
91
92
98
93
October
91.8
92
92
94
88
November
83.1
76
88
82
85
December
76.3
67
77
80
67
Average
88.6
78.6
88.2
89.9
93.9
89.0
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
6.7
6.2
6.7
8.0
7.0
6.0
February
7.9
6.4
10.0
8.4
9.3
6.5
March
10.0
11.0
9.5
11.6
9.4
April
13.1
13.0
11.8
13.0
10.0
May
17.0
17.5
16.3
17.6
14.1
June
21.0
18.8
23.6
20.6
21.0
July
21.9
21.3
21.3
22.8
20.6
August
22.4
23.1
20.6
25.1
19.8
September
19.6
19.6
22.1
19.6
20.6
October
15.7
15.5
16.6
17.1
15.4
November
10.7
10.5
11.0
11.9
10.4
December
7.9
8.3
9.0
4.7
8.1
Average
13.6
6.3
14.6
14.9
15.4
13.4
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
3.4
2.9
3.0
4.5
4.2
2.7
February
4.0
2.6
6.7
4.5
5.4
2.3
March
5.3
7.0
5.0
5.5
4.7
April
7.2
8.3
7.0
7.2
4.4
May
10.6
12.3
10.0
11.4
8.9
June
14.4
13.0
15.5
14.4
14.9
July
15.9
15.8
16.0
15.5
15.9
August
16.4
17.3
15.5
17.5
15.1
September
14.1
14.1
16.1
13.9
14.6
October
11.5
11.1
12.5
12.6
11.0
November
7.2
6.7
7.4
8.1
6.7
December
4.8
5.0
6.2
1.5
5.0
Average
8.8
2.7
10.0
10.0
10.0
8.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
11.4
15
15
14
8
12
February
11.6
13
19
2
13
10
March
11.8
21
20
3
9
April
6.1
13
8
4
6
May
6.4
16
5
4
9
June
5.3
9
2
7
9
July
5.7
10
7
2
6
August
6.1
8
8
2
7
September
8.9
11
6
15
2
October
11.0
12
14
5
14
November
14.2
10
27
17
14
December
14.9
18
20
11
15
Average
9.2
13.8
13.0
10.0
6.6
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
13.5
12
15
16
11
13
February
15.1
12
16
13
20
14
March
13.5
12
15
10
13
April
11.5
15
12
13
11
May
10.6
10
11
10
13
June
10.7
11
10
10
9
July
11.1
11
15
10
10
August
11.0
11
12
9
12
September
11.1
12
10
10
10
October
13.4
11
14
12
14
November
13.2
11
17
15
11
December
14.4
15
17
9
13
Average
12.1
11.9
12.2
13.0
11.3
11.5
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
194°
225°
218°
233°
232°
February
139°
205°
251°
223°
150°
March
185°
220°
083°
259°
April
234°
346°
001°
349°
May
264°
356°
272°
242°
June
264°
359°
265°
333°
July
239°
236°
282°
262°
August
226°
250°
348°
272°
September
202°
172°
255°
210°
October
167°
203°
199°
201°
November
211°
207°
181°
234°
December
219°
212°
120°
201°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.