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
65.4
86
67
52
69
56
February
74.0
63
75
80
85
83
March
82.5
79
84
89
89
89
April
90.3
88
94
93
94
97
May
91.8
90
94
96
92
95
June
93.3
95
96
92
95
92
July
94.6
93
96
96
95
96
August
92.5
95
91
93
89
91
September
88.7
94
89
88
89
October
82.6
70
90
92
88
November
70.1
78
80
70
71
December
62.7
53
69
59
59
Average
84.9
87.7
85.6
87.9
87.1
85.5
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
4.6
4
6
6
3
7
February
5.8
8
6
7
5
7
March
8.0
9
8
9
9
8
April
11.3
12
11
10
9
13
May
16.1
18
16
16
14
15
June
20.6
19
22
20
22
21
July
21.1
21
21
21
22
19
August
21.8
22
21
23
19
24
September
18.1
22
16
18
19
October
13.7
13
15
13
13
November
8.1
8
8
8
10
December
4.9
5
2
4
5
Average
13.0
14.1
13.3
13.1
12.2
13.4
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
1.8
1
3
2
0
5
February
1.8
4
2
2
0
4
March
2.8
4
2
0
1
4
April
4.9
5
3
3
2
7
May
9.3
10
7
8
7
9
June
13.0
11
11
11
13
14
July
13.9
13
13
12
14
11
August
14.4
13
14
14
13
15
September
11.6
13
10
12
10
October
9.0
8
9
8
9
November
4.7
3
5
5
5
December
2.1
2
-2
0
3
Average
7.5
7.6
6.8
6.2
6.1
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
19.6
19
19
19
23
26
February
19.3
18
9
27
9
36
March
10.1
5
6
1
10
13
April
7.4
10
7
6
6
5
May
4.6
4
1
2
6
5
June
4.6
5
1
2
2
8
July
6.1
5
9
2
1
10
August
5.4
5
4
1
5
5
September
9.0
1
11
6
8
October
13.1
17
3
7
16
November
14.8
14
6
17
10
December
18.4
22
3
15
21
Average
9.9
7.5
7.7
5.7
7.4
12.4
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
9.8
11
11
11
9
10
February
10.6
11
10
12
10
13
March
9.7
9
10
8
8
11
April
7.7
9
10
10
2
10
May
8.6
8
9
9
9
10
June
8.2
8
8
7
7
9
July
8.7
8
9
9
8
8
August
7.9
8
8
7
9
7
September
8.0
7
8
7
8
October
8.7
10
8
8
9
November
8.3
9
9
8
9
December
9.0
11
6
9
8
Average
8.7
8.8
8.9
8.7
7.7
9.0
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
257°
248°
277°
254°
239°
February
247°
277°
258°
112°
243°
March
132°
257°
113°
248°
240°
April
245°
083°
332°
054°
278°
May
076°
052°
273°
262°
300°
June
260°
010°
279°
338°
071°
July
255°
248°
281°
290°
261°
August
242°
264°
015°
289°
142°
September
224°
218°
255°
244°
October
224°
230°
221°
201°
November
236°
185°
242°
225°
December
251°
165°
214°
175°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.