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
73.6
84
74
94
82
37
February
83.0
98
92
94
68
98
March
96.3
96
99
99
100
95
April
97.7
98
97
96
96
100
May
96.8
97
93
100
97
100
June
98.6
99
95
99
100
98
July
99.7
100
100
100
100
99
August
99.3
100
99
98
100
99
September
96.8
95
99
92
97
100
October
90.8
90
95
78
97
84
November
73.9
89
55
81
54
December
71.0
64
68
74
62
Average
92.3
96.2
92.7
91.7
92.9
88.7
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
3.9
6
7
6
5
2
February
8.2
13
8
10
7
10
March
12.4
15
13
12
11
12
April
17.3
20
15
15
14
19
May
21.7
23
21
23
19
20
June
27.2
27
26
29
29
25
July
29.0
32
30
31
30
27
August
29.3
32
29
30
27
29
September
23.2
24
27
21
24
25
October
17.6
17
20
17
16
16
November
9.9
10
10
10
8
December
5.0
6
4
5
6
Average
17.4
20.7
17.5
17.6
16.3
16.6
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
-4.3
-3
1
-4
-3
-4
February
-2.9
4
-2
-1
-2
0
March
0.2
4
1
-4
-2
0
April
4.6
6
5
3
2
2
May
9.9
11
11
10
7
8
June
15.1
16
14
15
15
15
July
16.0
18
17
16
18
15
August
16.3
18
16
17
14
16
September
11.3
13
13
11
10
11
October
6.4
6
8
8
4
7
November
2.5
2
3
1
2
December
-2.9
-1
-1
-2
2
Average
6.6
9.2
7.0
6.3
5.1
6.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.7
18
28
6
13
15
February
13.5
13
12
9
13
9
March
10.9
13
11
8
8
15
April
11.2
14
18
16
16
2
May
12.7
11
17
8
21
11
June
6.8
9
10
5
1
15
July
4.2
2
6
5
4
7
August
5.3
6
7
7
8
5
September
9.5
15
10
18
8
4
October
10.5
10
11
8
8
21
November
17.7
25
14
11
18
December
19.1
20
22
18
27
Average
10.5
10.3
13.6
9.7
10.1
11.4
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
7.3
8
7
10
8
5
February
8.1
8
8
10
7
11
March
7.9
8
9
6
7
8
April
8.2
8
7
8
9
7
May
7.3
7
7
6
9
9
June
6.6
6
6
7
6
7
July
7.2
7
8
9
7
6
August
6.3
6
6
6
6
7
September
6.7
7
6
7
6
7
October
6.7
6
7
5
7
7
November
6.5
8
5
7
4
December
7.0
6
7
7
7
Average
7.1
7.0
7.0
7.1
7.2
7.0
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
297°
325°
297°
284°
278°
February
245°
295°
300°
321°
292°
March
176°
273°
045°
292°
358°
April
271°
354°
301°
279°
295°
May
088°
062°
294°
274°
311°
June
220°
347°
329°
344°
309°
July
319°
295°
306°
298°
325°
August
327°
290°
351°
297°
326°
September
077°
074°
280°
289°
312°
October
141°
234°
242°
133°
250°
November
281°
068°
037°
117°
December
270°
036°
318°
120°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.