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
98.2
100
98
99
96
100
February
94.9
96
100
96
95
91
March
95.0
80
96
97
96
96
April
95.6
95
98
94
98
May
98.2
98
95
99
99
98
June
98.7
99
99
99
100
July
99.3
99
100
99
100
August
99.3
99
99
99
100
September
99.2
100
100
99
100
October
96.7
97
96
96
99
November
97.7
99
98
99
100
December
97.6
100
99
90
99
Average
97.3
93.1
97.9
98.2
97.0
98.4
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
13.7
16.3
15.0
13.8
14.5
11.6
February
15.5
15.0
17.8
15.5
16.3
15.3
March
16.4
14.3
17.3
18.6
14.4
15.8
April
18.7
19.1
21.0
17.6
17.1
May
22.7
22.1
21.6
23.3
24.5
21.3
June
27.8
25.6
28.1
29.8
28.8
July
30.8
30.8
31.6
32.7
30.3
August
31.1
31.5
31.8
32.8
29.8
September
26.4
25.1
28.3
27.1
26.8
October
22.8
22.8
25.5
24.6
22.0
November
17.3
18.8
19.1
19.0
15.8
December
14.5
14.8
16.0
14.1
15.5
Average
21.0
16.9
21.7
22.8
22.6
20.8
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
1.3
3.9
3.1
1.1
-2.8
0.3
February
3.3
4.4
4.5
1.9
2.3
5.4
March
5.1
5.5
7.0
5.5
6.9
3.6
April
6.9
7.4
6.9
6.2
6.0
May
10.5
9.9
10.5
10.8
10.8
10.0
June
15.2
15.0
16.3
15.6
15.5
July
18.0
18.1
19.3
18.1
17.3
August
18.2
19.3
18.6
19.1
17.5
September
14.9
13.8
15.5
15.8
16.8
October
11.7
13.5
13.9
13.6
10.8
November
6.3
9.5
7.0
7.7
5.7
December
2.7
2.7
2.0
5.5
2.7
Average
9.1
5.9
10.4
9.9
10.2
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.0
1
5
2
0
5
February
4.6
4
2
8
3
7
March
8.7
30
10
1
18
1
April
6.5
8
2
7
3
May
5.5
7
9
8
2
5
June
3.8
8
2
1
1
July
1.2
1
2
1
1
August
1.6
2
3
2
0
September
2.8
5
3
2
3
October
4.0
7
1
3
3
November
4.7
7
0
1
12
December
2.3
3
0
4
0
Average
4.7
11.1
5.6
2.7
3.5
3.2
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
4.8
6
5
4
3
5
February
5.1
5
6
5
5
6
March
6.6
6
8
6
7
6
April
6.9
7
6
7
6
May
6.0
5
6
6
7
7
June
6.5
7
6
7
7
July
6.7
8
8
7
7
August
6.4
6
7
6
6
September
5.6
6
6
6
6
October
5.7
6
7
5
6
November
4.8
5
6
4
6
December
3.5
3
3
4
3
Average
5.9
5.8
6.2
6.0
6.0
6.0
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
213°
188°
118°
159°
176°
February
173°
165°
104°
176°
172°
March
087°
198°
181°
068°
137°
April
178°
158°
123°
150°
May
178°
169°
157°
168°
179°
June
172°
179°
172°
179°
July
179°
176°
172°
166°
August
168°
169°
171°
167°
September
167°
169°
168°
152°
October
176°
200°
164°
164°
November
072°
215°
185°
033°
December
030°
194°
179°
216°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.