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
98.6
98
100
100
98
97
February
98.0
98
96
99
98
98
March
96.6
96
95
99
100
95
April
94.0
83
93
99
98
May
92.0
84
83
95
97
95
June
90.5
92
94
87
89
94
July
89.1
89
97
85
93
August
89.8
79
96
91
88
September
91.5
94
88
100
82
October
95.0
94
95
98
92
November
96.8
94
96
99
93
December
98.1
98
95
100
99
Average
94.4
93.6
91.5
95.1
96.1
93.7
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
28.1
28.0
28.3
29.6
28.5
27.6
February
27.4
28.5
28.6
29.3
25.3
26.3
March
25.6
25.6
25.5
29.5
23.6
24.1
April
22.3
21.3
21.8
19.8
23.3
May
17.9
19.1
14.9
19.3
17.0
17.3
June
15.2
13.8
16.8
15.8
13.4
14.5
July
14.2
13.4
15.4
15.3
15.5
August
16.3
14.5
17.1
16.5
16.0
September
18.3
20.0
17.0
18.6
17.8
October
20.8
22.8
20.6
20.3
21.8
November
24.7
25.0
24.0
26.1
24.5
December
26.2
24.6
25.5
28.0
26.6
Average
21.6
22.9
21.0
22.0
20.8
21.2
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
20.5
20.0
20.0
21.0
20.5
20.0
February
19.7
20.6
21.0
19.3
18.3
19.0
March
18.2
18.8
18.0
21.3
15.9
17.8
April
15.6
15.3
14.4
13.1
15.9
May
11.9
12.9
10.0
13.0
10.5
10.5
June
9.0
6.5
11.1
9.9
6.2
8.8
July
8.1
6.5
9.6
8.6
7.7
August
9.1
9.3
9.3
7.9
8.5
September
11.2
11.9
11.0
9.5
11.6
October
13.5
15.0
12.0
12.0
13.4
November
17.4
17.3
16.6
17.5
17.0
December
19.3
16.1
18.8
20.1
19.8
Average
14.7
15.7
14.1
14.6
13.0
14.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.7
3
0
3
6
5
February
5.4
10
4
3
8
8
March
5.5
11
7
3
9
6
April
7.1
20
5
8
3
May
8.2
11
9
8
7
7
June
4.5
6
8
1
2
4
July
5.8
2
6
8
4
August
5.3
14
3
2
4
September
7.1
5
8
3
13
October
7.0
6
9
8
8
November
4.8
6
8
6
8
December
4.0
5
8
2
1
Average
5.7
8.1
7.0
5.5
5.5
5.8
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
9.9
10
9
9
9
10
February
9.3
8
10
9
9
9
March
9.0
8
8
9
8
8
April
8.8
9
8
8
7
May
8.5
7
9
8
7
9
June
8.4
8
8
7
7
8
July
8.8
7
9
8
9
August
8.7
10
9
8
7
September
9.2
9
10
8
10
October
10.0
9
10
11
9
November
10.0
10
10
10
10
December
9.9
9
10
10
10
Average
9.3
8.2
8.9
9.1
8.6
8.8
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
144°
124°
147°
139°
127°
February
095°
139°
199°
179°
153°
March
128°
106°
148°
153°
149°
April
131°
180°
278°
081°
May
117°
184°
260°
196°
273°
June
305°
154°
222°
271°
239°
July
183°
104°
120°
308°
August
167°
323°
168°
135°
September
122°
146°
135°
142°
October
126°
145°
169°
165°
November
143°
150°
145°
160°
December
172°
134°
157°
132°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.