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
70.0
76
51
75
75
73
February
73.4
57
80
78
70
84
March
79.7
59
77
95
85
82
April
80.8
85
87
95
97
33
May
94.0
93
96
96
92
93
June
84.6
58
98
93
91
84
July
91.6
89
89
95
93
92
August
90.9
93
88
89
92
93
September
83.1
78
82
90
81
79
October
75.3
69
87
71
73
73
November
61.3
66
71
47
63
December
62.2
66
88
68
44
Average
80.8
77.4
84.6
88.7
84.2
77.6
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
-1.6
-5
1
1
-4
5
February
1.2
0
2
2
-2
4
March
5.2
5
2
7
6
6
April
7.7
8
10
10
9
1
May
16.1
21
17
15
14
13
June
20.5
15
23
22
22
21
July
20.7
21
20
21
24
18
August
20.4
20
19
22
19
22
September
15.8
17
18
15
15
16
October
9.7
11
8
11
11
10
November
3.6
0
6
3
7
December
-2.8
-5
-5
-3
3
Average
9.6
11.4
9.7
10.9
9.6
10.5
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
-7.1
-14
-4
-6
-10
-1
February
-7.2
-6
-7
-5
-11
-5
March
-5.5
-2
-8
-7
-3
-3
April
-3.4
-2
-2
-4
-4
0
May
2.4
5
1
3
3
1
June
7.8
5
8
9
10
7
July
9.5
11
9
9
11
7
August
9.3
10
11
10
8
9
September
6.0
6
8
6
6
6
October
2.5
3
0
3
4
4
November
-2.6
-5
2
-3
1
December
-7.3
-11
-11
-9
0
Average
0.7
1.5
0.0
1.1
0.3
2.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.7
23
19
10
26
11
February
12.0
25
9
0
14
12
March
10.6
12
19
1
10
12
April
10.1
18
14
11
7
0
May
9.9
5
7
11
18
10
June
8.0
4
6
11
10
9
July
13.4
18
14
12
9
15
August
9.7
10
18
7
9
4
September
11.7
12
8
11
15
12
October
14.8
10
10
14
20
18
November
23.0
25
26
20
20
December
25.0
41
13
16
27
Average
13.3
12.3
13.7
10.1
13.2
11.3
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
4.9
4
5
6
4
6
February
5.6
6
5
6
4
7
March
5.5
5
5
5
6
7
April
5.9
6
5
5
7
7
May
5.3
5
6
6
5
6
June
5.0
6
5
5
5
5
July
4.9
5
5
6
4
5
August
5.0
6
4
5
5
4
September
4.8
4
6
5
4
5
October
5.2
4
6
5
6
5
November
4.7
5
5
4
5
December
3.6
4
4
3
4
Average
5.0
5.1
5.1
5.1
4.8
5.5
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
175°
186°
280°
024°
215°
February
198°
317°
218°
006°
217°
March
105°
346°
274°
245°
230°
April
069°
037°
357°
345°
300°
May
146°
245°
238°
076°
315°
June
203°
159°
198°
194°
157°
July
208°
194°
253°
170°
227°
August
211°
147°
196°
358°
197°
September
181°
200°
032°
208°
214°
October
198°
347°
207°
196°
138°
November
014°
132°
200°
200°
December
014°
006°
018°
150°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.