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
January
91.9
78
98
94
February
88.4
75
92
91
March
92.6
89
90
98
April
98.1
98
99
97
May
98.2
97
99
99
June
96.8
96
98
97
July
88.5
85
87
94
August
90.7
89
93
91
September
93.5
95
93
92
October
95.5
94
96
96
November
99.2
100
99
99
December
93.4
86
97
98
Average
91.6
82.5
93.2
95.3
95.5
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
January
25.1
24.8
25.3
25.0
February
26.6
26.3
26.6
26.8
March
26.7
26.3
27.8
26.3
April
24.9
25.5
24.3
25.1
May
23.9
24.3
23.6
24.0
June
22.7
23.0
22.8
22.3
July
21.5
21.6
21.8
21.3
August
21.9
21.6
23.3
21.0
September
24.3
24.5
25.5
23.1
October
25.7
25.8
25.5
25.8
November
23.4
24.5
23.3
22.6
December
24.5
25.1
24.5
23.3
Average
23.0
25.8
24.6
24.3
23.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
January
12.5
12.5
14.1
11.0
February
12.8
13.0
13.3
12.3
March
15.0
15.5
15.6
13.9
April
15.5
16.3
13.9
16.6
May
15.5
15.3
15.8
15.5
June
14.1
14.0
14.6
13.6
July
13.6
14.4
13.5
12.9
August
13.7
14.6
13.8
12.8
September
14.5
14.5
15.1
13.9
October
15.3
16.1
16.1
14.0
November
15.5
15.4
16.0
15.4
December
13.7
14.1
13.3
13.5
Average
14.8
14.0
14.8
14.1
14.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
January
1.9
0
2
3
February
0.2
0
1
0
March
2.8
3
1
5
April
6.4
7
10
1
May
2.0
3
2
1
June
0.6
0
1
1
July
4.7
6
5
4
August
4.5
6
2
6
September
3.6
0
3
8
October
2.3
0
6
0
November
12.8
9
18
10
December
4.8
1
7
8
Average
3.3
1.2
3.0
5.0
4.2
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
January
2.2
2
2
3
February
2.2
1
2
3
March
2.2
1
2
3
April
2.4
2
2
4
May
3.5
3
4
4
June
4.4
5
4
5
July
4.8
3
5
7
August
4.2
5
4
4
September
4.6
5
3
5
October
3.8
4
3
5
November
1.5
1
2
2
December
1.8
2
2
2
Average
2.9
1.4
2.9
3.0
4.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
January
103°
087°
132°
February
131°
126°
129°
March
149°
139°
143°
April
117°
146°
153°
May
145°
162°
165°
June
165°
154°
158°
July
164°
176°
162°
August
165°
162°
158°
September
153°
164°
154°
October
162°
157°
156°
November
130°
132°
140°
December
098°
075°
143°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.