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
98.7
96
100
96
100
100
February
97.4
98
95
92
96
99
March
94.9
96
96
81
94
100
April
95.3
94
89
89
99
May
92.2
98
91
96
98
June
93.6
99
92
89
92
July
97.0
100
97
98
93
August
97.7
100
92
95
99
September
88.4
43
98
77
96
October
97.3
91
99
95
99
November
98.5
96
99
97
99
December
98.0
97
96
93
99
Average
95.9
96.4
92.3
93.4
93.3
97.8
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
31.7
31.6
32.5
31.1
32.7
31.0
February
31.3
30.5
31.6
30.3
30.6
31.8
March
30.6
30.6
31.6
29.0
29.8
30.6
April
31.2
32.7
30.1
30.5
30.6
May
31.1
32.2
30.3
29.3
31.0
June
30.8
32.6
30.3
29.5
29.8
July
31.4
32.5
32.1
31.1
30.0
August
32.2
34.2
32.5
30.8
32.1
September
32.9
34.3
32.7
32.7
31.6
October
32.8
33.1
34.0
32.0
33.0
November
32.1
31.1
32.7
31.8
31.8
December
32.0
32.2
31.8
32.2
32.1
Average
31.6
30.9
32.5
31.4
31.0
31.3
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
24.4
24.8
25.3
24.0
24.8
24.3
February
24.1
24.3
25.0
23.8
24.1
24.3
March
23.9
24.1
25.1
23.5
24.0
23.8
April
23.9
25.0
23.8
23.6
23.8
May
23.8
24.3
24.3
23.6
23.5
June
22.6
24.1
21.8
22.0
22.0
July
22.5
23.6
24.1
23.0
21.5
August
23.1
24.0
24.3
22.6
23.1
September
23.9
24.5
24.3
24.3
23.8
October
24.8
25.3
25.8
25.1
23.8
November
25.0
25.0
25.8
24.6
25.0
December
24.8
25.5
24.3
25.0
25.3
Average
24.0
24.4
24.7
24.1
23.8
23.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.4
6
0
7
0
5
February
5.3
12
8
7
5
3
March
6.6
5
6
15
10
5
April
4.6
3
11
4
9
May
4.2
2
6
8
5
June
2.5
0
3
4
5
July
1.6
1
2
0
1
August
2.2
0
6
4
2
September
3.4
4
3
4
2
October
3.4
7
1
10
0
November
4.1
9
2
4
4
December
4.2
3
8
5
3
Average
4.3
7.3
3.5
5.8
4.7
3.5
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
1.9
3
3
2
3
2
February
1.5
2
2
2
3
2
March
1.5
2
2
2
2
2
April
1.6
2
2
5
2
May
1.2
2
2
2
2
June
1.5
3
2
3
3
July
1.3
3
2
2
2
August
1.5
3
2
2
2
September
1.5
2
2
3
2
October
1.9
3
2
3
3
November
2.2
3
2
3
4
December
2.1
4
3
3
2
Average
1.9
2.4
2.6
2.1
2.6
2.4
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
134°
124°
129°
125°
119°
February
126°
116°
119°
118°
123°
March
113°
116°
116°
133°
114°
April
114°
104°
166°
101°
May
118°
110°
133°
107°
June
130°
116°
156°
137°
July
125°
117°
130°
105°
August
125°
111°
101°
107°
September
125°
122°
115°
111°
October
139°
124°
126°
116°
November
126°
120°
126°
145°
December
159°
140°
126°
119°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.