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
91.9
92
92
96
84
89
February
89.5
94
93
91
95
82
March
87.6
94
90
84
88
81
April
85.1
95
77
78
89
May
85.2
90
95
89
78
85
June
83.0
96
81
77
77
82
July
86.4
92
89
75
86
August
89.4
94
85
86
85
September
92.1
95
89
92
92
October
91.7
87
97
81
November
92.4
92
95
91
0
December
94.4
92
95
93
0
Average
89.3
93.0
91.4
89.2
84.7
85.4
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
22.2
22.5
22.6
21.8
20.8
21.1
February
22.1
22.6
22.3
22.8
21.8
20.5
March
20.6
21.3
20.8
21.1
20.1
20.0
April
17.6
17.0
18.1
16.1
18.1
May
15.2
15.0
13.5
15.6
14.3
15.9
June
13.3
12.9
13.4
14.6
12.5
14.3
July
13.1
12.5
13.5
12.1
13.8
August
13.6
13.1
14.0
13.5
13.5
September
14.5
14.0
14.1
14.5
14.1
October
16.1
16.6
16.3
15.6
November
18.5
18.1
16.8
19.3
12.0
December
20.7
20.3
19.8
21.8
14.0
Average
17.4
18.8
17.0
17.3
16.7
16.9
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
12.3
12.5
12.9
12.5
12.9
11.3
February
12.5
12.5
13.5
12.4
12.5
12.4
March
11.0
11.9
10.9
12.3
11.0
11.3
April
9.4
9.5
10.5
8.6
9.5
May
7.6
7.0
5.5
8.0
6.9
8.4
June
7.2
5.4
8.6
8.0
8.0
7.4
July
5.9
3.7
7.2
6.2
5.4
August
6.4
5.4
7.5
6.4
7.0
September
6.9
7.4
7.9
6.7
7.7
October
8.0
9.3
7.4
8.6
November
10.0
9.9
9.0
12.0
12.0
December
11.2
11.5
11.4
12.5
14.0
Average
9.1
9.8
9.0
9.5
9.2
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
1.7
1
0
0
6
3
February
0.8
1
1
0
0
1
March
2.3
1
6
3
2
2
April
7.2
5
6
17
5
May
8.5
11
8
3
9
9
June
18.1
6
26
17
27
10
July
11.3
4
10
27
4
August
10.5
10
14
14
6
September
8.7
7
19
4
10
October
6.4
5
4
11
November
3.5
4
3
2
0
December
1.1
1
1
1
0
Average
6.0
3.4
5.8
6.1
9.6
4.8
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
9.8
9
10
10
9
10
February
9.4
10
10
11
10
8
March
8.7
9
9
8
10
8
April
7.6
8
7
9
8
May
7.0
7
7
7
7
7
June
7.9
7
10
9
7
8
July
7.8
8
7
9
8
August
8.2
9
8
9
8
September
8.6
9
9
8
9
October
9.1
9
9
10
November
9.4
9
10
10
6
December
9.9
10
10
10
15
Average
8.7
8.7
8.8
8.9
8.9
8.1
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
238°
231°
232°
255°
238°
February
234°
231°
228°
254°
260°
March
246°
223°
240°
227°
256°
April
265°
250°
256°
235°
May
209°
276°
227°
210°
206°
June
195°
006°
329°
038°
247°
July
189°
325°
352°
197°
August
279°
244°
237°
333°
September
264°
285°
229°
332°
October
243°
236°
235°
November
247°
242°
264°
210°
December
239°
242°
229°
019°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.