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
60.0
58
69
69
51
61
February
72.6
57
75
85
76
89
March
82.4
77
86
91
79
88
April
92.5
90
90
90
95
97
May
93.9
97
98
95
96
90
June
95.0
96
98
98
100
87
July
94.3
93
98
98
94
98
August
95.6
98
88
93
94
98
September
91.7
97
90
93
92
October
84.2
82
86
88
80
November
62.3
70
56
56
68
December
56.5
46
58
54
53
Average
85.8
86.7
86.6
87.9
85.4
86.6
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
2.0
1
4
4
0
5
February
3.5
6
3
5
1
6
March
6.7
8
6
8
6
8
April
11.6
13
10
10
9
13
May
16.5
20
17
16
15
14
June
21.6
21
21
22
23
20
July
21.9
23
22
22
25
21
August
22.9
23
22
25
20
24
September
18.2
22
16
17
20
October
13.1
13
14
13
13
November
6.4
5
6
7
8
December
2.6
3
-1
1
3
Average
12.5
14.4
12.4
12.5
11.5
12.7
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
-2.1
-3
1
-1
-4
1
February
-2.3
2
-2
1
-5
1
March
-1.5
2
-1
-2
-1
-1
April
2.5
4
3
1
0
2
May
6.6
9
5
6
6
5
June
11.7
12
11
12
12
12
July
13.1
13
12
13
15
12
August
13.3
13
14
15
13
13
September
9.8
12
8
9
11
October
6.5
6
8
5
7
November
2.4
1
3
3
4
December
-2.9
-1
-5
-4
-1
Average
5.2
6.5
5.1
5.0
4.2
5.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
25.6
28
17
34
38
22
February
21.0
34
23
24
23
16
March
14.1
14
18
3
18
14
April
9.7
13
7
10
13
3
May
7.3
4
5
8
11
13
June
4.8
8
3
4
2
8
July
8.1
9
9
7
7
6
August
5.3
2
10
4
9
5
September
7.6
2
10
5
6
October
12.5
22
5
6
10
November
17.1
24
11
32
12
December
24.0
28
19
24
16
Average
11.2
11.5
11.9
9.7
13.3
10.0
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
2024
2023
2022
2021
2020
January
10.5
12
10
13
8
12
February
10.9
11
12
14
8
14
March
10.1
9
11
8
11
11
April
10.4
10
9
11
11
11
May
9.2
8
9
10
10
10
June
8.7
9
8
8
8
8
July
9.2
9
9
10
8
10
August
8.1
8
8
8
9
8
September
9.1
8
8
9
9
October
10.1
11
9
10
9
November
8.6
9
8
9
9
December
9.9
11
7
10
10
Average
9.5
9.1
9.3
9.5
9.3
9.8
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
258°
225°
281°
254°
249°
February
257°
276°
255°
266°
250°
March
146°
259°
344°
268°
253°
April
271°
017°
332°
300°
288°
May
088°
045°
277°
226°
305°
June
258°
010°
289°
345°
020°
July
268°
253°
282°
290°
262°
August
275°
246°
028°
282°
009°
September
223°
285°
275°
249°
October
252°
248°
212°
207°
November
219°
174°
240°
235°
December
249°
206°
241°
162°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.