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
95.5
97
98
100
90
99
February
95.9
97
95
95
95
93
March
96.2
96
95
97
97
96
April
93.0
84
92
97
95
May
92.0
88
84
92
93
98
June
84.6
90
84
84
90
86
July
85.4
89
94
72
95
August
82.9
73
88
87
75
September
84.8
84
84
97
75
October
89.1
89
88
88
94
November
93.4
89
96
96
86
December
95.9
94
92
99
99
Average
91.3
93.9
88.6
92.1
91.7
91.1
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
28.5
27.8
30.1
28.8
27.3
February
27.7
29.8
28.8
29.5
26.6
25.3
March
25.9
27.6
25.8
29.1
24.6
24.6
April
22.5
21.8
22.1
22.6
23.6
May
18.8
20.3
16.3
20.0
17.6
18.1
June
16.1
14.8
17.3
16.8
14.0
15.8
July
15.4
14.5
16.6
15.9
16.0
August
16.6
16.1
18.0
17.1
16.3
September
18.5
20.6
17.5
18.6
17.8
October
20.7
23.3
21.1
20.0
21.1
November
24.3
26.1
24.0
26.5
23.3
December
25.9
24.8
25.1
28.0
26.5
Average
21.9
24.1
21.9
22.5
21.5
21.3
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
18.4
18.8
17.6
18.6
19.8
18.0
February
18.6
20.3
19.8
18.3
18.1
18.1
March
17.1
18.1
17.1
19.8
15.1
17.6
April
14.2
14.5
12.6
12.5
15.9
May
11.1
12.4
10.0
11.8
9.1
10.3
June
8.5
6.4
10.1
8.5
6.0
9.0
July
7.5
4.7
8.6
7.2
7.4
August
8.1
8.9
7.7
7.0
7.7
September
9.9
9.9
10.1
8.3
11.5
October
11.7
12.5
10.8
11.1
11.6
November
14.5
15.5
13.6
15.0
14.5
December
16.3
15.1
17.1
17.1
17.0
Average
13.2
15.2
12.9
13.1
12.0
13.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
4.0
3
4
1
10
2
February
5.8
4
4
7
9
17
March
5.9
9
5
7
7
6
April
7.4
15
6
4
7
May
7.1
7
10
5
8
6
June
9.1
10
9
5
2
14
July
8.7
4
9
11
9
August
8.5
13
5
2
7
September
7.9
4
10
1
14
October
7.5
5
8
10
4
November
5.2
5
5
5
8
December
4.2
6
6
4
2
Average
6.6
6.2
6.9
6.1
6.1
7.7
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
9.5
9
9
10
10
10
February
9.4
8
9
10
10
9
March
9.2
9
8
9
10
9
April
8.7
9
7
7
8
May
8.6
7
9
8
10
10
June
8.9
8
8
8
8
10
July
8.9
7
9
9
9
August
9.1
11
9
8
7
September
9.3
8
11
8
10
October
9.7
8
10
11
9
November
9.9
10
11
9
10
December
9.9
10
9
10
9
Average
9.2
8.4
8.8
9.3
9.1
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
140°
119°
141°
134°
112°
February
141°
133°
170°
198°
144°
March
182°
147°
139°
241°
125°
April
165°
188°
245°
061°
May
163°
208°
259°
219°
251°
June
286°
278°
268°
243°
254°
July
243°
193°
266°
281°
August
213°
279°
211°
166°
September
134°
157°
180°
140°
October
149°
171°
168°
172°
November
127°
167°
095°
156°
December
189°
160°
150°
124°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.