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
99.5
99
100
99
100
99
February
99.6
100
100
99
100
100
March
99.3
100
99
99
99
100
April
98.5
99
99
96
99
May
98.3
99
98
93
98
99
June
99.1
96
100
99
100
100
July
97.8
99
100
98
96
August
98.0
94
99
100
99
September
99.0
100
100
100
98
October
99.5
100
100
100
100
November
99.5
100
98
100
100
December
99.8
100
100
100
100
Average
99.0
98.8
99.0
98.7
98.9
98.9
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
25.2
25.1
25.8
25.1
24.1
24.6
February
26.0
26.8
27.0
27.0
24.3
24.5
March
25.1
25.0
25.6
26.6
24.1
24.1
April
23.4
24.3
25.1
22.5
22.3
May
21.7
21.8
20.8
22.6
21.1
21.1
June
19.8
19.6
20.0
21.6
19.3
19.1
July
18.6
18.3
20.8
18.3
17.6
August
18.6
18.3
21.0
18.1
17.6
September
18.7
19.3
21.3
17.8
17.3
October
20.3
21.0
22.0
19.3
18.8
November
22.4
22.8
22.8
22.6
22.1
December
23.8
23.3
24.1
24.3
23.6
Average
22.1
23.6
22.2
23.3
21.2
21.0
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
22.1
22.6
22.8
21.5
20.8
21.6
February
22.5
24.0
23.0
23.0
21.5
21.3
March
21.6
21.5
22.6
22.8
20.6
20.0
April
20.0
21.1
21.6
19.1
19.3
May
18.7
18.6
18.8
19.3
18.3
17.1
June
17.1
17.0
17.6
17.8
16.8
16.6
July
16.4
16.5
18.3
16.5
15.6
August
16.0
16.3
18.6
16.1
15.4
September
16.4
17.3
19.0
16.0
15.0
October
17.7
18.1
19.3
17.1
16.5
November
19.6
20.5
20.1
19.6
18.5
December
21.0
20.8
21.8
21.1
21.0
Average
19.3
20.7
19.6
20.2
18.5
18.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
0
June
0.1
0
0
0
0
0
July
0.4
0
0
0
0
August
0.3
3
0
0
1
September
0.2
0
0
0
0
October
0.3
1
0
0
0
November
0.1
0
0
0
0
December
0.0
0
0
0
0
Average
0.1
0.2
0.0
0.0
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
8.8
9
9
10
10
8
February
9.6
10
9
11
10
9
March
9.5
9
10
10
12
8
April
8.1
8
9
8
8
May
6.6
7
8
8
7
7
June
5.4
6
6
8
8
6
July
5.7
6
7
7
6
August
6.3
7
8
7
2
September
6.7
6
8
8
5
October
7.2
7
8
9
7
November
7.4
7
8
9
8
December
7.9
9
9
8
8
Average
7.5
8.0
7.8
8.5
8.5
6.6
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
168°
169°
161°
158°
146°
February
161°
162°
159°
161°
142°
March
159°
162°
161°
153°
155°
April
167°
167°
163°
154°
May
174°
172°
178°
182°
158°
June
164°
189°
188°
174°
168°
July
195°
188°
182°
170°
August
180°
192°
187°
188°
September
200°
185°
178°
187°
October
188°
174°
178°
181°
November
186°
177°
190°
174°
December
169°
175°
180°
174°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.