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
84.5
78
92
80
90
78
February
90.0
83
95
96
91
93
March
95.6
98
93
97
100
98
April
96.2
95
97
94
95
May
97.7
97
99
99
99
96
June
98.1
96
99
99
99
July
98.5
99
97
100
99
August
98.3
98
98
100
98
September
96.6
97
100
97
97
October
89.6
84
92
84
85
November
79.2
71
91
78
75
December
77.7
95
77
83
56
Average
92.9
90.7
93.6
94.4
94.3
90.9
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
4.1
5.5
4.5
5.0
4.4
2.2
February
8.0
6.0
10.6
7.4
9.4
9.3
March
12.2
13.0
13.5
12.4
11.9
11.9
April
16.2
17.6
14.3
14.6
13.1
May
19.7
19.5
20.1
19.1
22.5
17.3
June
26.0
25.1
25.1
27.8
27.3
July
27.6
28.8
26.8
29.5
27.6
August
27.4
30.1
26.3
28.1
25.5
September
21.4
21.8
24.3
20.0
22.6
October
17.0
16.5
18.8
18.8
14.0
November
8.9
7.7
10.0
10.0
7.5
December
4.2
5.4
6.4
2.7
1.3
Average
15.6
11.1
16.8
16.4
17.1
15.0
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
-5.7
-2.9
-6.7
-2.1
-6.4
-5.7
February
-3.7
-2.5
0.4
-5.9
-3.2
-2.7
March
-1.6
1.8
3.2
0.7
-4.0
-3.3
April
2.9
3.6
2.2
1.8
0.8
May
8.3
8.0
9.5
9.0
9.5
6.2
June
13.2
13.9
13.0
13.8
13.0
July
14.4
16.0
14.8
14.4
15.0
August
14.6
16.3
14.5
14.9
13.0
September
9.9
11.1
11.0
9.1
8.9
October
6.1
8.4
8.5
7.2
3.5
November
1.7
-1.5
0.3
2.7
1.3
December
-3.6
-3.0
-2.3
-1.0
-4.9
Average
4.8
1.8
6.1
5.6
5.2
4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
14.5
18
13
23
6
25
February
14.0
14
17
6
9
16
March
12.9
22
22
10
5
8
April
13.0
12
15
12
13
May
15.3
12
17
21
10
21
June
7.6
10
10
3
2
July
5.4
5
7
3
5
August
6.2
4
14
3
6
September
12.3
16
7
18
5
October
11.1
18
14
5
9
November
15.9
9
13
14
18
December
16.8
3
12
47
11
Average
12.0
16.0
12.1
12.6
9.4
10.9
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
2.9
3
3
3
3
3
February
3.5
3
3
3
5
4
March
4.0
4
3
4
5
4
April
4.4
5
4
5
4
May
4.1
4
5
4
4
4
June
4.2
4
4
5
4
July
3.9
4
4
5
4
August
3.6
3
3
4
3
September
3.7
5
4
3
3
October
3.0
3
3
2
3
November
2.7
2
3
3
2
December
2.5
3
3
2
2
Average
3.6
3.6
3.6
3.6
3.9
3.5
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
177°
234°
276°
116°
292°
February
118°
282°
320°
081°
206°
March
164°
256°
283°
135°
104°
April
211°
141°
181°
169°
May
147°
152°
124°
143°
248°
June
214°
128°
114°
147°
July
126°
217°
112°
162°
August
110°
125°
134°
133°
September
306°
134°
153°
129°
October
199°
206°
136°
138°
November
360°
315°
245°
173°
December
323°
252°
251°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.