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
54.7
57
73
58
42
51
February
65.6
61
70
69
66
64
March
85.3
90
77
84
88
93
April
93.5
96
94
81
94
100
May
96.1
99
98
97
94
99
June
96.0
90
95
98
96
98
July
95.0
97
96
91
97
96
August
97.8
97
98
100
98
September
91.7
98
77
86
99
October
80.5
79
80
90
86
November
60.4
68
50
74
45
December
45.8
54
49
48
55
Average
84.7
87.7
86.3
82.1
85.0
85.8
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
-3.2
-5
-2
-2
-3
1
February
-2.6
1
-2
1
-6
2
March
4.5
6
6
3
2
10
April
13.8
17
14
13
13
12
May
19.3
19
19
17
20
16
June
24.5
26
22
25
25
26
July
26.2
29
25
26
28
26
August
26.4
27
28
28
25
September
19.5
22
15
16
23
October
12.1
12
11
12
15
November
3.7
5
3
6
4
December
-1.6
0
-1
-2
-2
Average
12.2
13.3
12.4
11.9
11.7
13.1
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
-8.5
-12
-7
-8
-6
-2
February
-7.5
-5
-8
-4
-12
-3
March
-3.3
-2
0
-6
-4
1
April
3.8
6
5
3
2
3
May
8.3
6
6
6
9
9
June
13.5
14
11
13
14
16
July
14.6
16
14
13
16
14
August
14.2
15
16
15
13
September
8.6
9
7
7
11
October
4.0
3
4
1
7
November
-1.0
0
-1
0
0
December
-4.0
-4
-6
-7
-6
Average
3.8
3.3
3.7
3.4
2.9
5.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
33.0
40
15
52
37
23
February
24.7
20
31
20
30
24
March
13.5
5
16
19
12
7
April
7.6
4
8
16
9
7
May
6.3
2
3
7
8
19
June
4.7
4
9
2
6
6
July
5.6
5
4
4
2
6
August
2.3
2
2
4
3
September
8.0
0
21
14
1
October
11.3
20
17
3
3
November
14.9
26
13
13
22
December
27.8
34
14
33
21
Average
11.1
8.8
11.6
13.5
11.8
10.3
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
9.2
9
10
9
9
9
February
9.5
11
10
9
8
9
March
9.6
8
11
9
10
11
April
9.5
9
9
9
9
11
May
8.2
8
7
9
9
9
June
7.8
8
8
6
7
8
July
7.0
7
8
7
6
7
August
7.5
7
10
7
7
September
8.1
6
7
8
10
October
9.1
12
8
8
10
November
9.1
11
8
9
9
December
9.4
11
10
8
9
Average
8.5
8.2
8.7
8.3
7.9
8.9
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
239°
159°
267°
191°
262°
February
172°
279°
249°
284°
233°
March
128°
230°
351°
278°
217°
April
236°
095°
204°
212°
290°
May
350°
032°
298°
187°
247°
June
299°
022°
360°
055°
102°
July
342°
300°
332°
013°
295°
August
161°
092°
113°
338°
September
080°
245°
298°
168°
October
255°
275°
221°
154°
November
206°
117°
237°
186°
December
211°
150°
191°
138°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.