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
91.8
93
98
84
82
95
February
92.3
95
99
86
82
94
March
92.3
93
93
98
87
95
April
81.6
75
99
54
70
May
81.4
71
66
94
79
64
June
87.8
84
84
95
79
79
July
86.2
87
96
66
82
August
80.3
75
96
60
77
September
77.1
73
96
71
53
October
77.8
79
93
76
49
November
92.4
91
97
88
90
December
91.6
88
97
94
85
Average
86.5
87.1
83.8
94.3
75.9
76.8
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
23.5
21.5
24.8
23.6
22.1
22.3
February
24.9
23.6
26.1
26.0
22.0
23.3
March
24.8
23.1
24.3
28.8
22.8
24.1
April
22.9
22.1
28.5
19.8
20.8
May
21.2
19.8
19.6
25.6
18.8
20.1
June
20.5
20.5
19.5
24.6
18.6
20.3
July
20.0
19.0
24.5
17.8
19.8
August
19.2
18.3
23.3
17.5
18.8
September
18.9
18.3
22.8
17.3
17.6
October
19.1
19.0
21.6
17.8
17.8
November
20.4
19.6
21.5
20.1
19.6
December
21.7
20.0
22.5
22.8
20.3
Average
21.6
21.6
20.9
24.4
19.7
20.4
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
18.6
17.3
19.3
17.1
18.3
19.3
February
20.2
20.1
22.5
20.6
18.5
20.1
March
20.0
19.3
19.6
23.6
17.1
20.6
April
18.5
18.8
22.8
16.3
17.6
May
17.2
16.8
16.1
20.3
15.6
17.6
June
17.2
17.8
15.5
21.3
14.4
18.1
July
16.4
15.8
19.6
14.5
17.5
August
16.0
15.3
19.3
14.4
16.3
September
15.4
15.5
16.3
14.3
15.0
October
15.2
15.0
15.6
14.3
15.0
November
16.0
16.1
16.8
15.5
16.3
December
17.4
15.5
18.1
18.0
16.8
Average
17.5
18.2
17.0
19.3
15.8
17.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.4
1
1
0
0
2
February
0.2
0
0
0
1
0
March
0.6
2
0
0
1
1
April
0.5
0
0
1
1
May
0.0
0
0
0
0
1
June
0.2
1
0
0
0
1
July
0.1
0
0
1
0
August
0.3
0
0
1
1
September
0.4
1
0
0
3
October
0.2
0
1
0
1
November
0.1
0
1
0
0
December
0.3
0
1
0
0
Average
0.3
0.7
0.1
0.2
0.4
0.8
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
8.0
8
8
7
8
8
February
7.6
7
8
7
8
8
March
7.8
8
8
8
7
8
April
8.6
9
8
9
9
May
8.5
8
9
8
9
8
June
7.8
7
8
9
9
7
July
7.9
8
8
9
8
August
8.4
8
8
9
9
September
9.0
9
9
10
9
October
9.0
9
9
10
9
November
8.3
8
9
8
9
December
8.4
9
8
7
9
Average
8.2
7.7
8.3
8.2
8.5
8.3
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
162°
163°
164°
162°
167°
February
168°
164°
172°
162°
172°
March
164°
161°
177°
168°
170°
April
155°
164°
163°
159°
May
161°
156°
163°
157°
163°
June
164°
164°
163°
157°
167°
July
162°
162°
162°
169°
August
167°
164°
165°
167°
September
166°
163°
164°
169°
October
164°
157°
166°
166°
November
166°
158°
166°
165°
December
158°
161°
170°
161°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.