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
65.2
77
66
86
55
76
February
76.1
74
77
81
71
82
March
84.5
77
88
88
90
74
April
93.8
95
89
97
99
93
May
97.0
97
96
99
98
98
June
99.2
98
99
100
99
100
July
99.1
100
99
99
99
99
August
99.3
99
100
100
100
100
September
95.4
89
99
96
94
October
89.7
95
94
90
93
November
73.4
79
84
75
88
December
60.7
70
54
71
44
Average
88.5
91.3
89.1
92.6
89.1
88.7
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
3.3
2
4
5
5
5
February
5.8
8
4
8
4
7
March
10.4
10
14
6
9
13
April
18.1
23
16
20
18
16
May
23.5
21
23
22
26
23
June
30.2
32
28
30
29
31
July
32.5
33
32
32
32
35
August
32.3
33
35
35
34
30
September
25.9
26
27
22
28
October
18.7
19
18
15
22
November
9.9
13
11
10
10
December
5.1
8
3
6
2
Average
18.1
20.2
18.5
18.6
17.5
18.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-4.5
-6
-4
-3
-3
-2
February
-3.2
-1
-5
-2
-6
-4
March
1.4
2
3
-2
0
3
April
5.7
9
7
7
8
2
May
11.4
11
13
10
12
11
June
16.9
19
17
16
18
16
July
19.4
20
19
19
18
20
August
19.1
20
21
20
21
17
September
13.7
15
15
13
14
October
7.3
7
9
6
8
November
2.0
5
3
2
2
December
-1.3
-1
1
-2
-1
Average
7.6
9.1
8.0
7.8
7.2
7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.8
13
8
15
5
11
February
15.1
13
22
4
21
12
March
12.3
16
4
27
12
12
April
6.7
5
13
2
4
11
May
9.9
16
12
12
5
11
June
5.2
14
9
4
3
2
July
4.8
5
8
6
5
3
August
2.4
2
0
1
0
6
September
5.1
7
6
9
2
October
7.0
9
8
13
2
November
11.9
8
7
8
8
December
19.4
20
16
12
38
Average
8.9
10.2
9.3
8.3
7.3
8.9
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
2024
2023
2022
2021
2020
January
4.9
5
4
6
4
5
February
6.2
7
7
6
6
6
March
6.9
6
7
8
8
6
April
6.9
7
7
7
8
6
May
7.2
7
7
8
8
7
June
7.2
7
7
7
7
7
July
7.2
7
7
8
7
8
August
7.4
8
7
9
7
7
September
6.8
5
8
6
8
October
5.9
5
7
7
6
November
5.5
6
6
5
6
December
5.0
5
6
4
5
Average
6.6
6.8
6.2
7.3
6.5
6.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
320°
319°
315°
045°
323°
February
097°
351°
360°
023°
021°
March
042°
007°
354°
339°
037°
April
063°
018°
033°
343°
027°
May
096°
306°
331°
027°
350°
June
281°
108°
107°
006°
116°
July
123°
175°
305°
097°
134°
August
095°
106°
108°
153°
081°
September
100°
012°
045°
101°
October
320°
345°
066°
104°
November
311°
338°
332°
313°
December
319°
075°
310°
066°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.