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
56.2
43
75
74
58
43
February
71.8
59
76
68
77
68
March
86.8
85
88
93
82
April
96.2
99
96
99
95
May
99.1
100
99
100
100
June
99.5
100
98
100
99
July
99.3
100
100
98
100
August
99.9
100
100
100
100
September
97.6
94
100
99
100
October
92.2
88
98
97
95
November
71.4
57
75
71
87
December
48.4
30
58
72
48
Average
83.5
50.8
85.6
90.1
91.4
87.7
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
0.6
3.5
0.4
1.0
1.5
0.7
February
1.4
-2.0
4.2
0.1
5.7
-1.7
March
8.2
8.1
12.5
4.7
5.0
April
16.9
23.1
17.3
18.3
15.1
May
23.1
22.3
21.5
20.1
25.3
June
30.9
31.6
27.0
31.0
30.3
July
32.3
35.0
30.8
29.8
33.7
August
32.3
32.5
33.8
35.0
33.6
September
24.6
26.8
25.3
24.3
20.6
October
16.4
15.3
18.1
15.9
13.8
November
6.8
6.7
10.5
7.2
8.5
December
1.6
0.7
3.5
0.5
3.1
Average
14.2
0.8
17.2
16.9
16.7
15.9
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
-5.4
-1.3
-7.0
-8.7
-5.9
-4.5
February
-5.1
-9.6
-3.3
-7.5
-1.6
-7.7
March
-1.3
-1.1
3.1
-4.5
-2.1
April
5.9
9.5
6.2
6.9
7.0
May
10.8
8.5
11.8
9.1
12.3
June
17.4
19.1
15.9
17.3
17.6
July
19.3
20.1
18.6
15.8
20.8
August
18.5
18.3
20.1
19.6
20.3
September
11.8
12.1
13.0
12.9
10.9
October
6.3
6.2
7.5
6.7
2.7
November
0.2
2.1
3.7
0.8
0.5
December
-4.9
-3.5
-2.1
-7.2
-2.0
Average
4.9
-5.6
6.9
7.1
6.6
6.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
23.3
20
22
17
24
18
February
21.3
23
18
24
13
28
March
12.2
6
8
19
16
April
5.0
3
5
2
10
May
5.7
1
4
8
4
June
1.7
2
3
1
3
July
2.1
0
1
5
1
August
0.8
0
0
0
2
September
3.5
0
2
5
8
October
7.1
10
3
11
10
November
13.9
18
13
12
8
December
23.2
18
15
8
29
Average
10.3
21.4
6.9
6.6
8.1
9.8
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
11.2
11
12
14
11
11
February
11.9
11
13
13
12
13
March
12.5
11
11
13
14
April
12.6
12
13
13
12
May
11.3
10
10
12
13
June
10.3
11
10
9
11
July
10.3
10
11
10
8
August
11.0
12
10
14
9
September
11.7
17
10
11
9
October
11.5
12
12
13
11
November
11.6
13
13
13
11
December
12.0
13
14
14
11
Average
11.4
11.1
12.1
11.4
11.9
11.0
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
222°
227°
124°
242°
160°
February
008°
145°
246°
230°
256°
March
089°
206°
302°
248°
April
156°
112°
193°
302°
May
079°
360°
295°
200°
June
308°
328°
064°
137°
July
060°
271°
325°
081°
August
063°
058°
116°
090°
September
107°
078°
279°
238°
October
301°
242°
258°
110°
November
279°
223°
190°
201°
December
147°
216°
118°
197°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.