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
44.2
42
39
49
46
48
February
73.8
53
66
77
83
82
March
92.5
93
88
99
87
91
April
97.9
99
99
100
99
May
99.6
100
100
99
99
100
June
99.7
100
100
100
100
100
July
100.0
100
100
100
100
August
99.9
100
100
100
100
September
99.6
100
99
99
100
October
95.0
88
99
89
96
November
59.8
48
80
47
45
December
33.9
59
38
17
34
Average
86.1
81.8
85.5
89.3
85.6
86.0
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
4.9
5.5
8.8
0.8
7.0
4.5
February
9.2
10.0
8.6
9.4
10.3
11.5
March
16.5
17.0
15.6
21.0
14.0
14.0
April
23.4
23.6
23.8
27.0
22.8
May
29.1
31.8
28.0
29.1
27.6
30.1
June
33.8
35.1
35.2
35.7
34.1
34.8
July
35.8
35.2
37.1
36.1
35.0
August
33.1
34.0
33.2
32.2
33.6
September
28.5
28.0
28.1
29.8
30.8
October
20.3
20.6
23.3
20.6
18.0
November
11.9
12.3
16.8
11.0
10.6
December
5.2
4.0
7.2
2.2
7.4
Average
20.9
19.9
21.2
22.2
21.5
21.1
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
-3.7
-2.3
1.7
-8.7
0.1
-5.0
February
1.2
1.1
1.0
2.1
1.7
3.2
March
6.6
6.5
5.5
9.3
6.2
4.7
April
11.9
13.0
12.5
14.9
10.5
May
17.0
19.3
16.3
16.6
17.1
18.1
June
21.1
21.8
22.6
22.3
21.8
21.6
July
23.4
23.1
24.5
23.6
23.3
August
21.1
23.1
20.5
20.8
21.1
September
15.9
15.0
16.8
17.5
16.3
October
9.5
11.0
11.8
10.5
7.0
November
2.7
3.9
5.9
3.6
1.0
December
-2.5
-4.7
-1.9
-3.3
-1.5
Average
10.5
9.5
11.1
11.2
11.6
10.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
5.6
0
4
2
11
2
February
7.9
3
9
14
6
5
March
7.1
11
8
3
16
6
April
4.7
1
3
2
2
May
2.6
3
4
0
6
1
June
1.5
1
0
1
0
0
July
0.8
1
0
0
4
August
0.8
1
3
0
0
September
1.3
1
1
3
0
October
4.5
7
3
9
1
November
5.6
9
1
7
1
December
5.7
2
6
12
4
Average
3.7
3.7
3.4
2.7
5.4
2.0
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
3.0
3
3
3
3
3
February
3.8
3
4
4
4
4
March
4.5
4
5
4
5
5
April
5.1
5
5
5
5
May
5.2
5
5
6
5
5
June
5.3
6
5
5
5
6
July
5.0
6
5
5
5
August
4.9
5
5
5
5
September
4.4
5
5
4
4
October
3.8
4
4
4
4
November
3.0
3
3
3
3
December
2.8
3
3
3
3
Average
4.4
4.3
4.5
4.4
4.3
4.4
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
193°
205°
185°
151°
207°
February
157°
133°
154°
104°
166°
March
115°
148°
164°
193°
185°
April
170°
148°
157°
174°
May
171°
173°
162°
206°
149°
June
164°
146°
149°
160°
121°
July
149°
174°
158°
159°
August
179°
152°
169°
165°
September
174°
155°
188°
182°
October
176°
178°
183°
154°
November
191°
146°
154°
186°
December
189°
193°
192°
176°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.