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
93.1
68
97
97
91
97
February
91.3
68
99
92
92
89
March
82.1
34
75
93
81
89
April
75.6
72
88
77
51
May
72.1
0
76
86
92
68
June
77.6
0
73
93
92
88
July
91.9
86
92
92
90
August
92.3
82
95
94
93
September
96.8
92
99
99
93
October
95.5
87
100
97
100
November
94.3
86
100
97
97
December
96.0
79
100
97
96
Average
84.3
32.9
82.9
94.2
91.5
86.4
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
16.9
17.1
18.3
16.6
14.6
19.5
February
20.0
19.6
20.6
19.3
19.8
21.6
March
24.0
21.6
26.8
24.6
23.3
23.5
April
29.2
28.6
28.8
29.5
31.0
May
30.5
1.1
35.7
32.2
32.6
36.3
June
34.9
0.0
41.5
37.8
40.7
41.3
July
41.3
41.7
43.7
40.0
41.7
August
39.8
40.0
38.6
40.2
42.8
September
36.8
36.2
35.7
39.1
38.7
October
29.9
33.2
32.2
30.5
28.8
November
23.3
26.0
25.8
23.3
23.3
December
18.3
17.8
17.8
22.6
17.6
Average
27.5
11.6
30.6
29.5
29.9
30.5
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
4.6
2.7
7.5
3.9
2.2
5.9
February
7.9
8.0
7.9
7.7
7.7
9.3
March
11.0
7.5
12.9
11.1
11.0
10.8
April
16.5
15.8
14.9
16.1
17.0
May
18.5
0.0
21.3
19.3
19.3
21.6
June
22.3
0.0
26.1
24.6
26.3
28.3
July
24.9
23.6
28.6
26.1
13.5
August
25.3
26.1
25.3
27.1
24.3
September
24.2
25.1
23.5
25.8
23.8
October
17.2
11.8
18.8
18.1
17.5
November
10.1
4.7
12.1
11.8
12.3
December
6.4
2.6
7.5
11.4
4.5
Average
14.8
3.5
15.4
16.5
17.1
15.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.1
0
0
0
0
0
February
0.3
0
0
1
0
0
March
0.2
0
0
0
0
0
April
0.0
1
0
0
0
May
0.0
0
0
0
0
0
June
0.0
0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.1
0
0
0
0
November
0.3
0
0
0
0
December
0.9
0
3
2
0
Average
0.1
0.0
0.0
0.2
0.1
0.0
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
7.5
7
7
7
6
8
February
9.1
10
10
10
8
10
March
10.1
8
9
9
11
10
April
11.4
13
11
12
12
May
9.8
0
10
13
9
11
June
9.1
0
11
10
9
11
July
8.7
7
9
9
8
August
8.7
9
9
9
8
September
9.0
9
9
9
9
October
8.3
9
9
7
9
November
7.5
7
7
8
8
December
7.8
8
7
8
7
Average
8.7
4.8
9.1
9.2
8.9
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
175°
222°
223°
301°
216°
February
085°
244°
075°
062°
133°
March
162°
182°
065°
122°
074°
April
059°
087°
083°
108°
May
045°
100°
204°
107°
054°
June
360°
086°
101°
103°
125°
July
072°
113°
077°
111°
August
050°
075°
088°
124°
September
061°
089°
122°
131°
October
117°
131°
109°
091°
November
159°
189°
243°
225°
December
047°
265°
187°
225°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.