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
2024
2023
2022
2021
2020
January
74.5
80
86
71
67
65
February
77.0
57
80
83
79
73
March
80.3
84
87
80
90
81
April
87.0
84
90
92
86
May
84.4
84
86
92
89
June
79.7
81
86
70
86
July
87.8
87
94
85
81
August
85.5
84
78
83
89
September
86.8
90
92
83
92
October
81.4
88
81
85
85
November
83.2
81
87
89
78
December
73.1
76
76
68
75
Average
81.6
74.7
84.1
84.5
82.5
82.8
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
2024
2023
2022
2021
2020
January
8.2
8
9
9
7
10
February
9.4
11
9
10
9
10
March
10.8
11
11
12
11
10
April
12.8
12
13
10
15
May
15.3
15
16
14
16
June
18.7
20
19
18
18
July
20.6
20
22
20
19
August
20.2
20
22
19
22
September
18.6
21
18
20
19
October
15.6
17
17
16
14
November
11.5
12
13
11
13
December
9.4
10
6
10
9
Average
13.8
10.0
14.7
15.0
13.7
14.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.