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
73.3
70
73
80
70
74
February
75.4
73
77
69
73
74
March
84.5
70
89
91
87
87
April
88.7
80
91
93
86
91
May
92.0
98
97
94
80
97
June
97.1
98
97
97
95
97
July
94.2
90
90
95
97
93
August
93.2
94
87
95
89
97
September
85.7
88
82
92
87
86
October
73.6
73
75
75
59
73
November
59.1
65
30
70
69
December
62.8
75
69
73
58
Average
87.0
86.8
87.1
87.9
84.4
88.3
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
-5.4
-10
-2
-5
-7
1
February
-5.7
-5
-2
-3
-9
-1
March
-1.6
0
-3
2
0
1
April
5.2
3
6
5
6
4
May
12.5
15
14
13
12
11
June
18.9
20
19
19
21
21
July
21.0
22
19
21
23
19
August
19.1
21
21
20
18
19
September
13.6
17
16
12
11
14
October
6.2
8
3
7
7
8
November
0.7
-3
0
0
4
December
-3.4
-6
-4
-6
0
Average
7.4
9.2
7.0
7.6
6.3
8.4
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
-11.2
-17
-7
-11
-12
-4
February
-12.2
-10
-9
-11
-17
-7
March
-9.7
-5
-12
-7
-8
-5
April
-4.9
-3
-4
-3
-1
-3
May
3.1
4
4
2
4
2
June
9.6
11
8
8
11
12
July
12.4
14
12
11
14
11
August
10.8
12
12
10
10
10
September
6.6
9
9
5
4
6
October
1.1
2
-3
2
3
3
November
-4.5
-7
-4
-5
0
December
-8.7
-11
-9
-12
-4
Average
0.1
1.6
-1.3
-1.7
-1.3
1.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
35.4
26
25
20
53
23
February
30.3
28
24
38
33
25
March
22.1
26
25
10
24
13
April
13.9
22
10
14
16
13
May
10.2
3
8
11
19
7
June
7.7
9
8
9
6
5
July
8.8
12
14
10
3
16
August
9.4
8
9
10
16
4
September
12.1
12
13
9
13
15
October
17.9
16
23
12
27
21
November
21.4
26
19
23
16
December
38.1
53
47
38
40
Average
14.6
13.7
15.1
13.4
17.3
13.0
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
7.7
7
8
9
7
9
February
7.5
8
8
7
7
9
March
8.0
7
7
8
8
10
April
7.7
8
7
7
8
10
May
8.1
7
8
8
8
8
June
7.8
6
7
8
7
8
July
6.6
6
6
6
7
6
August
7.2
7
7
7
8
7
September
7.6
8
7
8
8
8
October
7.5
8
7
7
8
8
November
7.3
7
6
7
9
December
7.1
6
7
7
8
Average
7.5
7.2
7.1
7.4
7.6
8.0
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
206°
193°
284°
102°
218°
February
175°
216°
166°
135°
207°
March
175°
293°
259°
268°
241°
April
067°
095°
309°
282°
312°
May
298°
271°
287°
008°
295°
June
268°
315°
260°
284°
283°
July
139°
349°
251°
279°
187°
August
162°
138°
218°
094°
261°
September
208°
222°
058°
305°
223°
October
203°
342°
204°
171°
126°
November
083°
157°
198°
217°
December
128°
134°
041°
139°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.