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
100
100
100
100
98
February
99.7
100
100
99
100
98
March
99.3
100
99
100
100
97
April
99.2
99
100
100
100
May
98.4
100
97
99
100
98
June
97.1
98
97
99
100
97
July
94.7
91
96
99
92
August
95.3
90
96
97
95
September
96.3
97
92
99
97
October
99.0
99
100
100
100
November
99.7
100
100
100
100
December
98.3
100
100
100
99
Average
97.9
99.4
97.2
98.5
99.4
97.6
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
33.3
33.8
33.3
33.7
33.0
33.7
February
32.7
33.2
34.2
32.6
33.2
31.8
March
32.6
32.7
33.7
34.2
33.5
32.2
April
31.4
32.7
33.3
32.3
28.6
May
31.1
32.2
30.5
31.6
32.7
31.5
June
29.8
31.5
30.6
30.3
31.6
29.8
July
29.2
29.0
29.6
31.6
29.6
August
29.9
29.6
29.6
32.1
30.1
September
30.3
31.1
29.5
33.1
29.8
October
32.1
32.2
31.6
34.7
33.0
November
32.7
33.0
33.2
34.7
33.8
December
33.0
32.8
34.2
32.8
33.2
Average
31.5
32.7
31.9
32.0
32.9
31.4
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
23.0
22.1
24.0
23.6
23.6
23.6
February
21.9
22.6
20.6
22.8
24.1
23.5
March
21.8
19.6
19.3
24.6
19.5
23.3
April
21.4
22.3
21.6
20.8
19.8
May
20.9
21.5
20.0
21.6
20.1
23.3
June
20.3
19.3
18.0
21.6
21.5
23.3
July
19.0
17.6
18.3
23.0
20.1
August
19.5
19.3
19.6
20.3
23.8
September
19.8
22.3
16.1
19.8
23.1
October
21.5
21.6
21.3
22.3
24.3
November
22.2
19.8
21.6
23.1
25.1
December
22.2
19.1
19.6
23.1
24.0
Average
21.2
21.0
20.3
21.0
21.7
23.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.2
0
1
0
0
1
February
0.3
0
0
1
0
3
March
0.6
0
1
0
0
1
April
1.1
3
0
0
0
May
2.6
1
5
1
0
1
June
3.5
4
5
2
2
5
July
5.8
11
3
4
8
August
5.8
12
4
6
7
September
6.2
6
12
1
6
October
0.9
1
0
0
1
November
0.6
0
0
1
2
December
0.4
0
0
2
1
Average
2.9
1.1
3.7
1.8
1.3
2.6
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
7.8
7
6
7
7
7
February
8.4
7
7
7
8
8
March
7.6
7
6
7
8
7
April
8.0
6
7
8
7
May
7.9
7
7
6
8
8
June
7.4
7
7
7
7
7
July
7.7
7
7
8
7
August
8.8
7
9
10
8
September
8.7
7
8
8
9
October
9.2
8
8
8
10
November
9.3
7
9
10
11
December
8.2
7
8
8
9
Average
7.8
6.9
6.8
7.5
8.2
8.0
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
140°
135°
133°
096°
115°
February
166°
116°
121°
124°
104°
March
095°
110°
115°
106°
112°
April
098°
104°
097°
101°
May
097°
092°
094°
096°
100°
June
079°
091°
095°
092°
096°
July
090°
092°
093°
087°
August
086°
095°
090°
082°
September
093°
093°
092°
083°
October
103°
097°
098°
084°
November
125°
100°
102°
067°
December
131°
105°
107°
062°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.