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
77.2
82
91
59
80
71
February
89.3
86
85
94
92
97
March
95.9
95
96
99
99
97
April
97.4
98
97
97
98
100
May
95.4
92
95
100
96
96
June
96.7
94
97
96
96
97
July
97.6
97
99
99
91
100
August
98.0
99
96
99
97
99
September
95.6
98
96
93
93
October
87.0
95
80
86
92
November
79.0
90
77
65
84
December
74.8
71
75
74
84
Average
92.2
93.6
93.6
91.5
90.4
93.6
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
6.1
7
7
5
6
8
February
10.2
11
10
11
11
12
March
13.5
15
14
15
13
13
April
16.8
16
15
16
15
21
May
20.0
20
21
24
17
19
June
25.7
24
27
27
25
24
July
27.8
27
28
29
25
28
August
27.7
29
27
30
24
29
September
23.4
27
20
24
25
October
17.9
21
21
17
15
November
10.4
11
12
7
12
December
7.4
8
4
7
8
Average
17.5
18.5
18.0
18.2
15.8
17.7
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
0.7
1
2
0
1
1
February
1.7
5
0
2
3
4
March
3.2
5
3
3
2
3
April
5.2
6
5
5
4
6
May
9.2
10
11
11
8
7
June
13.7
14
13
14
15
12
July
15.3
15
16
15
14
15
August
15.4
16
16
16
14
16
September
11.3
13
9
12
12
October
8.5
9
11
6
8
November
3.9
4
6
2
4
December
2.4
4
0
2
3
Average
7.7
9.0
7.9
7.8
6.8
7.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
24.3
28
22
14
34
16
February
17.2
21
8
16
18
26
March
19.7
24
18
7
17
14
April
15.0
25
22
22
4
5
May
15.2
18
10
3
29
14
June
11.1
18
5
14
12
13
July
7.0
6
5
1
20
2
August
8.3
3
19
6
10
6
September
11.7
6
19
10
10
October
18.4
28
14
11
22
November
25.7
47
25
22
7
December
28.5
35
15
28
31
Average
15.5
16.7
16.9
11.8
17.3
12.8
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
8.7
9
11
7
10
8
February
8.8
8
7
9
10
12
March
8.7
7
10
7
8
10
April
8.1
9
9
9
10
7
May
7.7
6
9
7
9
10
June
6.6
7
6
6
6
7
July
6.3
5
7
7
6
7
August
6.2
5
6
7
7
6
September
6.7
6
7
6
7
October
8.0
8
8
8
10
November
7.9
11
7
7
6
December
8.4
9
7
8
9
Average
7.5
6.8
8.0
7.3
7.7
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
207°
201°
214°
202°
200°
February
194°
027°
208°
190°
208°
March
210°
219°
078°
282°
062°
April
217°
308°
015°
020°
188°
May
215°
017°
354°
214°
025°
June
249°
020°
285°
273°
268°
July
234°
217°
002°
288°
294°
August
302°
235°
018°
325°
229°
September
195°
232°
180°
273°
October
202°
199°
185°
199°
November
204°
204°
298°
198°
December
204°
014°
198°
196°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.