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
88.2
91
82
94
84
92
February
86.5
83
91
82
90
92
March
92.0
90
92
88
91
94
April
94.9
98
88
91
89
May
96.9
99
93
99
96
June
99.0
99
97
100
98
July
99.7
100
100
100
100
August
99.3
99
100
100
97
September
99.4
100
100
100
100
October
97.0
99
97
99
98
November
88.1
78
92
88
97
December
87.5
73
93
92
88
Average
94.1
88.0
93.9
94.0
95.3
95.3
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
7.1
9.5
6.7
8.5
5.7
8.5
February
6.7
1.6
10.5
5.4
8.6
6.9
March
11.1
14.0
12.3
11.1
6.4
8.6
April
16.4
20.8
15.5
16.3
13.5
May
21.1
21.3
20.1
18.8
21.6
June
27.3
28.1
26.6
27.6
24.6
July
30.4
33.5
29.3
29.0
30.6
August
31.1
31.3
32.7
31.6
29.5
September
25.7
28.0
27.3
24.3
21.8
October
19.1
18.6
20.5
18.1
15.6
November
12.3
10.8
15.0
12.9
13.4
December
9.3
8.3
10.5
9.5
10.0
Average
17.0
8.6
19.2
18.6
17.7
17.1
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
-1.9
1.5
-1.0
-1.0
-2.9
1.7
February
-1.4
-6.0
3.0
-2.5
2.3
-2.9
March
1.9
3.2
2.3
4.2
-2.9
-1.5
April
5.9
10.0
8.0
6.7
5.5
May
10.1
8.8
9.9
8.6
10.0
June
15.9
15.5
14.6
16.3
16.6
July
17.9
19.6
17.0
16.0
19.1
August
18.2
17.6
19.5
20.1
19.1
September
13.8
16.3
14.0
13.1
11.0
October
8.5
8.4
8.5
8.0
6.2
November
3.7
2.0
7.2
4.5
4.2
December
2.6
1.6
4.4
3.0
3.0
Average
7.2
-1.7
8.7
8.8
8.2
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
22.3
15
34
5
38
23
February
22.5
27
11
32
20
26
March
14.6
6
11
18
29
15
April
11.2
5
29
12
16
May
9.9
12
20
10
6
June
3.7
1
5
3
8
July
1.7
0
5
0
2
August
1.8
2
0
1
8
September
3.4
1
2
2
4
October
6.9
14
1
9
9
November
14.4
12
36
11
6
December
21.7
23
32
24
26
Average
10.7
15.4
8.9
14.1
11.2
11.2
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
10.9
10
12
10
12
12
February
12.6
14
11
14
12
13
March
11.5
12
9
12
13
11
April
11.0
12
11
10
11
May
9.7
11
9
11
10
June
9.0
9
9
9
10
July
9.3
11
9
9
9
August
10.0
9
11
9
8
September
10.4
11
12
10
10
October
9.5
7
10
10
12
November
10.7
12
12
11
10
December
11.1
12
12
13
10
Average
10.5
12.1
10.5
10.7
10.5
10.2
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
195°
154°
113°
259°
159°
February
056°
138°
118°
193°
139°
March
175°
092°
194°
052°
227°
April
168°
187°
203°
171°
May
067°
074°
202°
199°
June
292°
045°
037°
216°
July
054°
261°
345°
059°
August
035°
051°
105°
333°
September
088°
055°
269°
026°
October
260°
227°
343°
080°
November
064°
201°
096°
159°
December
087°
200°
112°
187°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.