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
84.8
92
91
91
77
80
February
92.9
98
88
99
85
March
96.9
97
98
97
98
April
97.1
97
96
94
97
May
96.7
94
99
98
98
June
96.6
95
99
98
95
July
97.5
99
98
99
95
August
97.3
97
95
97
96
September
96.1
99
97
92
96
October
91.7
84
96
94
90
November
81.2
74
93
80
77
December
78.8
77
87
84
59
Average
93.3
91.6
93.0
95.5
93.8
90.6
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
4.3
5.7
5.0
5.5
4.4
2.7
February
7.4
10.3
6.7
8.5
7.0
March
11.1
13.4
10.8
12.3
10.4
April
15.3
15.9
12.5
13.3
12.0
May
19.5
20.3
19.6
21.6
15.8
June
25.1
23.6
25.6
26.6
26.1
July
25.9
26.1
25.8
27.3
23.8
August
25.7
27.6
24.6
27.5
22.0
September
20.9
20.8
24.3
18.3
21.8
October
15.7
14.9
17.3
17.5
14.3
November
8.3
7.7
8.5
9.9
6.7
December
4.9
4.0
6.5
0.9
5.2
Average
14.3
5.6
15.8
15.7
16.1
14.0
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
-2.5
-2.6
-2.3
1.0
-1.9
-2.5
February
-1.5
3.7
-1.0
0.6
-3.5
March
1.0
3.1
2.3
-2.6
-1.8
April
3.6
5.0
3.5
2.7
1.1
May
7.8
10.1
8.1
9.1
5.9
June
12.7
13.0
11.8
12.8
13.5
July
13.5
13.9
13.9
12.9
13.4
August
13.8
14.5
14.4
13.9
12.1
September
9.5
11.4
10.9
9.0
9.9
October
6.4
7.7
7.2
7.7
4.2
November
2.3
2.3
3.0
2.3
1.8
December
0.1
-1.5
1.3
-4.2
0.8
Average
5.0
-2.6
6.9
6.4
5.8
4.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
21.2
14
18
17
26
36
February
14.9
17
16
14
19
March
13.0
10
21
7
9
April
11.4
18
16
17
14
May
11.4
18
10
8
19
June
7.5
10
7
6
7
July
9.5
11
11
7
15
August
8.7
7
18
5
10
September
8.7
13
4
20
3
October
11.9
11
16
9
10
November
14.7
13
23
16
19
December
19.0
13
25
18
22
Average
12.1
13.7
12.9
14.2
11.5
14.1
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
7.3
7
8
7
8
7
February
7.9
8
8
11
6
March
7.8
7
9
6
7
April
7.2
8
8
8
7
May
6.6
6
7
7
9
June
6.2
6
6
6
5
July
6.1
6
8
6
5
August
5.7
5
6
6
6
September
5.5
7
5
6
4
October
6.4
6
6
6
6
November
6.2
6
9
6
5
December
6.9
7
9
5
6
Average
6.7
7.2
6.6
7.1
6.6
6.2
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
187°
229°
235°
257°
225°
February
232°
263°
238°
122°
March
176°
233°
076°
263°
April
243°
312°
305°
295°
May
187°
036°
261°
248°
June
265°
002°
272°
322°
July
252°
249°
290°
263°
August
276°
241°
028°
264°
September
162°
148°
249°
223°
October
135°
203°
164°
188°
November
199°
232°
164°
215°
December
209°
229°
111°
203°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.