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
66
82
48
48
77
February
73.6
78
84
66
77
71
March
85.2
96
82
80
90
96
April
92.7
99
92
84
91
96
May
97.3
99
98
97
93
98
June
97.9
99
97
97
97
98
July
97.1
99
97
95
100
99
August
98.6
96
99
100
100
99
September
95.1
98
85
96
100
October
86.5
81
82
95
93
November
65.0
61
62
68
70
December
49.5
59
66
51
66
Average
87.3
94.0
88.5
83.9
87.4
91.2
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
-3.0
-5
-3
-3
-2
1
February
-2.3
0
-2
1
-5
2
March
4.3
5
7
2
3
10
April
14.4
19
14
15
14
12
May
19.8
19
19
17
21
18
June
25.0
27
22
26
26
26
July
26.8
29
24
27
30
28
August
27.1
28
26
29
30
26
September
19.9
22
16
16
23
October
12.3
12
11
11
16
November
3.5
5
2
6
4
December
-1.1
-1
-2
-2
-3
Average
12.5
15.3
12.2
12.0
12.4
13.5
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
-9.3
-13
-9
-9
-7
-3
February
-8.2
-6
-8
-4
-12
-4
March
-4.0
-4
-1
-7
-5
0
April
3.0
7
4
4
2
1
May
7.2
5
7
5
9
7
June
12.8
14
10
13
15
15
July
14.5
16
13
14
17
14
August
14.0
14
15
17
16
12
September
8.0
8
7
7
9
October
3.4
3
4
1
5
November
-2.1
-1
-2
0
-2
December
-6.8
-5
-7
-7
-9
Average
3.0
3.9
3.0
3.3
3.0
3.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
34.0
34
19
49
30
19
February
24.3
20
29
20
23
26
March
15.7
2
16
19
14
6
April
9.9
2
15
12
10
6
May
5.9
1
5
7
7
15
June
3.9
4
9
2
4
5
July
4.7
2
9
6
1
3
August
2.0
4
1
4
2
1
September
6.7
1
19
13
1
October
10.6
19
16
3
2
November
16.6
27
24
10
8
December
33.2
41
21
29
18
Average
11.5
6.3
13.6
13.9
10.2
8.0
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
8.2
8
9
9
9
8
February
8.9
10
9
8
8
9
March
8.8
7
9
8
9
10
April
8.5
8
8
9
9
11
May
7.5
7
7
9
8
8
June
7.0
8
7
7
6
7
July
6.6
6
8
7
6
7
August
6.8
7
6
8
7
7
September
7.3
6
7
8
10
October
7.6
9
8
7
9
November
8.1
9
8
9
8
December
8.3
10
10
8
8
Average
7.7
7.6
7.7
7.8
7.6
8.3
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
290°
150°
225°
179°
257°
February
165°
272°
239°
277°
236°
March
139°
224°
336°
280°
215°
April
240°
094°
182°
204°
280°
May
317°
007°
287°
149°
256°
June
289°
017°
334°
067°
089°
July
342°
291°
330°
348°
283°
August
312°
333°
096°
117°
333°
September
011°
240°
291°
184°
October
247°
261°
234°
148°
November
193°
308°
233°
187°
December
182°
149°
184°
123°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.