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
79.0
75
97
74
91
72
February
80.8
84
55
99
72
85
March
77.7
94
83
80
76
April
80.5
83
75
82
91
May
90.8
95
91
100
83
June
97.6
100
99
100
99
July
95.1
100
99
81
100
August
98.4
100
96
100
95
September
95.3
99
98
92
97
October
91.5
100
100
88
79
November
91.2
100
100
90
68
December
73.9
83
63
32
95
Average
87.6
79.3
92.9
90.5
86.7
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
0.1
1.7
2.1
-2.3
2.3
0.4
February
6.2
5.7
4.7
6.4
5.5
10.1
March
16.0
15.0
18.8
16.8
15.0
April
22.1
22.1
20.6
24.6
19.8
May
26.9
29.3
25.8
26.6
27.1
June
30.3
30.6
31.8
30.8
30.3
July
32.6
32.7
32.7
34.1
32.7
August
30.0
30.8
30.6
27.1
30.3
September
27.1
26.6
27.8
28.3
29.3
October
19.4
20.8
22.0
19.3
17.8
November
10.5
12.0
13.0
12.3
7.5
December
0.9
-2.7
4.0
-1.9
3.0
Average
16.9
3.6
18.8
19.4
19.6
18.6
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
-9.6
-7.0
-6.2
-11.0
-7.2
-9.5
February
-3.7
-3.2
-4.9
-1.0
-4.7
1.1
March
6.6
6.0
8.5
7.5
6.0
April
12.3
13.0
10.6
14.8
10.3
May
16.4
18.3
15.5
16.6
17.3
June
19.7
20.6
20.6
20.8
20.0
July
22.2
22.0
23.6
24.1
22.5
August
20.6
21.5
21.6
19.0
20.3
September
17.6
17.6
18.8
18.8
19.1
October
10.2
11.5
12.8
10.5
8.4
November
1.7
4.9
3.9
2.6
-2.7
December
-7.4
-8.9
-5.4
-8.7
-7.7
Average
7.7
-5.0
10.0
10.0
10.3
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
5.3
0
5
7
0
13
February
3.6
2
9
1
3
2
March
1.3
1
0
5
0
April
2.5
4
3
0
5
May
1.7
0
1
3
1
June
2.0
3
1
3
4
July
1.4
2
1
0
2
August
2.7
2
2
8
3
September
1.5
2
0
2
0
October
0.6
1
1
2
0
November
1.7
4
1
0
0
December
6.0
11
0
0
0
Average
2.3
1.0
3.1
1.4
2.3
2.3
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
3.8
4
4
4
4
4
February
4.8
5
5
4
5
5
March
6.1
7
6
6
6
April
7.2
8
7
7
7
May
8.4
8
8
9
8
June
8.6
8
9
9
9
July
7.6
7
8
7
8
August
7.0
7
8
7
7
September
7.1
7
7
7
7
October
6.1
6
6
6
7
November
5.0
5
5
6
5
December
3.8
4
4
4
4
Average
6.3
4.4
6.5
6.7
6.6
6.5
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
050°
048°
022°
093°
021°
February
059°
067°
130°
078°
063°
March
023°
126°
104°
028°
April
321°
143°
151°
054°
May
074°
203°
311°
115°
June
285°
226°
312°
280°
July
114°
112°
125°
241°
August
109°
158°
131°
115°
September
082°
100°
136°
104°
October
239°
098°
119°
060°
November
052°
008°
052°
066°
December
070°
077°
144°
212°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.