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
74.8
61
83
77
73
82
February
81.7
76
75
85
80
March
86.6
82
80
95
89
April
91.7
94
84
93
95
May
89.6
79
86
93
96
June
94.2
94
97
95
89
July
92.9
92
85
96
91
August
91.0
89
84
91
91
September
90.1
86
85
91
90
October
87.9
84
81
88
91
November
78.5
65
81
83
80
December
68.2
54
68
74
59
Average
84.9
61.0
82.9
82.4
89.4
87.9
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
6.6
6.0
6.7
7.9
7.2
6.0
February
8.9
11.0
9.0
10.0
8.1
March
11.4
12.5
10.9
13.5
10.8
April
14.6
14.9
12.8
14.5
11.1
May
18.7
19.0
18.3
19.8
15.8
June
22.6
20.0
25.3
22.1
22.8
July
23.1
22.3
22.6
24.1
21.8
August
23.6
24.3
22.0
26.1
20.8
September
20.2
20.1
22.8
19.3
21.3
October
16.1
15.9
16.6
17.8
15.5
November
10.4
9.9
9.9
12.0
10.0
December
7.7
8.0
8.5
3.7
8.0
Average
14.3
6.0
15.4
15.6
16.3
14.4
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
1.6
1.0
1.0
3.2
1.8
1.1
February
2.4
6.0
2.0
3.5
1.1
March
3.0
5.0
3.7
1.3
2.0
April
4.3
6.7
3.7
4.2
1.3
May
7.7
10.3
8.0
8.0
6.0
June
12.0
10.5
13.0
11.6
12.0
July
12.9
13.3
13.9
11.5
13.5
August
13.4
15.0
13.0
13.5
12.9
September
10.4
11.4
12.4
9.6
10.8
October
8.6
7.9
9.9
9.0
8.1
November
4.2
3.7
5.0
6.0
3.2
December
2.9
3.9
4.5
-3.6
3.2
Average
6.3
1.0
7.9
7.7
6.7
6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
20.2
25
26
32
10
13
February
19.4
38
5
31
11
March
19.7
29
40
3
7
April
14.6
30
24
16
8
May
12.8
31
15
8
14
June
10.3
19
10
16
8
July
12.8
25
25
5
9
August
10.8
10
23
8
10
September
15.5
24
15
32
3
October
17.9
18
31
15
18
November
21.7
25
38
21
13
December
20.8
22
33
12
16
Average
15.3
25.3
24.8
24.1
14.5
10.4
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
8.3
7
9
10
8
8
February
9.7
9
8
13
8
March
8.8
7
9
7
9
April
8.6
10
9
10
8
May
7.3
6
7
8
9
June
7.2
7
7
7
6
July
7.5
8
9
7
7
August
7.2
7
8
7
7
September
6.8
7
6
6
7
October
7.4
6
8
7
7
November
7.1
6
9
7
6
December
8.1
9
10
5
7
Average
7.6
6.5
7.6
8.4
7.4
7.4
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
212°
232°
227°
248°
235°
February
220°
261°
240°
138°
March
224°
238°
076°
263°
April
251°
305°
014°
356°
May
266°
010°
272°
248°
June
271°
026°
263°
324°
July
257°
241°
283°
270°
August
233°
263°
002°
274°
September
229°
203°
258°
224°
October
199°
217°
220°
221°
November
240°
221°
195°
245°
December
233°
230°
095°
216°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.