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
87.2
92
92
83
85
85
February
86.4
90
84
89
75
89
March
93.7
92
99
93
97
95
April
95.7
94
98
93
96
97
May
97.2
98
92
96
98
99
June
97.5
91
99
98
99
98
July
94.7
86
94
99
98
98
August
93.9
95
96
98
96
84
September
93.4
94
91
98
93
October
93.4
92
97
94
94
November
86.9
74
80
96
88
December
85.6
80
91
94
91
Average
93.4
92.1
92.6
93.7
94.8
93.2
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
-10.1
-12
-9
-9
-13
-5
February
-7.0
-7
-6
-3
-13
-2
March
0.7
1
4
-3
-2
4
April
10.2
13
12
10
12
10
May
18.0
13
22
16
24
20
June
21.3
24
21
20
25
20
July
24.9
23
27
26
24
28
August
22.2
20
22
26
26
21
September
15.0
18
15
13
16
October
7.5
7
8
8
9
November
-3.6
0
-6
-1
-3
December
-8.2
-11
-8
-6
-9
Average
8.1
9.4
9.0
8.3
8.2
9.1
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
-18.1
-20
-16
-18
-20
-12
February
-17.4
-17
-17
-12
-23
-10
March
-11.8
-9
-6
-17
-13
-5
April
-2.3
1
-3
-1
-1
-1
May
3.3
0
4
4
6
5
June
8.6
12
8
9
9
6
July
12.2
13
14
12
11
12
August
10.3
10
10
10
11
12
September
4.2
6
5
2
4
October
-1.6
1
1
-1
-1
November
-9.5
-5
-12
-8
-10
December
-16.8
-18
-18
-13
-16
Average
-3.6
-2.8
-2.2
-3.3
-4.6
-2.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
38.9
38
41
25
51
56
February
38.0
39
42
34
52
31
March
21.2
19
19
16
30
16
April
11.8
11
5
15
11
14
May
6.2
13
0
11
3
3
June
9.1
17
9
9
5
5
July
6.7
14
5
2
5
3
August
6.9
5
8
1
1
17
September
9.6
8
6
8
10
October
19.5
25
8
13
20
November
32.2
29
49
31
30
December
34.9
46
34
38
41
Average
15.8
16.6
15.3
13.6
15.9
16.2
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
8
11
6
7
9
February
7.6
9
7
7
9
8
March
9.7
9
11
9
10
11
April
9.6
10
9
9
9
11
May
9.1
11
7
10
8
8
June
8.6
9
8
9
7
8
July
7.1
8
8
7
7
6
August
7.4
7
7
7
7
8
September
8.3
8
8
10
9
October
9.3
9
9
9
10
November
8.2
8
8
10
8
December
7.1
7
7
8
9
Average
8.4
8.7
8.1
8.0
8.2
8.5
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
250°
275°
219°
132°
239°
February
270°
237°
202°
275°
212°
March
274°
240°
273°
271°
246°
April
265°
297°
234°
246°
219°
May
294°
189°
246°
268°
249°
June
325°
312°
296°
320°
296°
July
001°
268°
339°
329°
027°
August
305°
346°
330°
319°
314°
September
333°
225°
273°
285°
October
244°
246°
269°
269°
November
180°
316°
252°
268°
December
247°
259°
236°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.