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
99.2
99
100
100
96
99
February
96.3
99
99
99
90
98
March
87.4
99
100
89
99
April
96.3
100
99
96
96
May
98.0
99
99
93
97
June
97.0
98
99
91
99
July
98.2
99
99
96
97
August
98.9
99
99
99
97
September
98.2
100
100
98
96
October
98.9
100
100
99
97
November
98.5
99
99
98
94
December
98.2
100
100
98
91
Average
97.3
99.1
99.3
99.4
95.0
96.7
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
28.7
28.5
28.8
28.1
28.6
28.5
February
28.6
28.6
28.6
28.3
27.8
28.5
March
28.6
28.8
28.1
28.5
28.5
April
29.3
29.3
28.8
28.6
29.0
May
30.0
30.3
30.5
29.6
29.6
June
30.8
31.1
31.1
30.6
29.8
July
31.2
31.1
31.3
30.6
30.6
August
31.5
31.1
31.8
31.1
30.8
September
31.4
31.5
32.5
30.3
31.6
October
30.8
31.8
30.8
30.5
30.8
November
29.8
29.6
29.6
29.3
30.1
December
29.2
29.1
28.6
29.1
28.8
Average
29.8
28.5
30.1
30.0
29.6
29.7
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
23.7
23.8
25.0
23.5
24.5
23.8
February
23.7
24.3
24.1
23.3
23.6
24.3
March
24.2
25.1
24.3
24.6
24.6
April
25.4
25.6
24.3
25.0
25.1
May
26.0
26.6
23.6
26.3
26.3
June
27.1
27.8
26.8
27.6
26.3
July
27.1
27.8
28.1
27.0
27.5
August
26.9
27.3
27.5
26.8
28.3
September
26.8
25.6
27.8
26.0
27.3
October
26.4
28.0
27.6
26.8
27.3
November
25.5
25.8
26.6
25.6
26.3
December
24.8
24.5
25.1
24.6
25.5
Average
25.5
24.1
26.1
25.7
25.7
26.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.5
4
3
3
3
5
February
4.3
5
5
3
8
5
March
2.9
4
1
3
3
April
2.3
4
1
2
2
May
2.3
4
1
1
4
June
3.0
2
2
1
9
July
3.3
2
3
5
3
August
3.2
2
3
2
3
September
3.4
4
1
5
3
October
4.8
4
5
4
3
November
5.0
11
2
5
1
December
3.5
3
2
2
6
Average
3.5
4.2
3.9
2.1
3.2
3.8
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
8.3
8
9
8
8
8
February
9.2
10
7
9
9
11
March
8.6
8
8
11
10
April
8.9
8
9
10
8
May
8.9
7
9
10
9
June
9.0
8
9
9
11
July
9.6
9
10
11
11
August
8.8
9
9
8
10
September
7.2
7
8
8
7
October
7.2
7
7
7
8
November
7.5
7
8
8
8
December
8.2
8
8
7
9
Average
8.5
8.9
7.8
8.5
9.0
9.2
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
072°
087°
082°
094°
080°
February
084°
096°
076°
079°
095°
March
084°
084°
090°
087°
April
081°
097°
096°
096°
May
109°
136°
098°
100°
June
108°
118°
101°
088°
July
092°
094°
090°
094°
August
088°
099°
089°
084°
September
097°
103°
110°
103°
October
111°
118°
106°
114°
November
091°
097°
099°
084°
December
086°
071°
035°
082°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.