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
67.5
73
70
72
59
70
February
73.4
65
78
80
76
74
March
75.3
75
69
81
78
86
April
92.1
86
96
91
96
95
May
91.8
89
99
97
85
95
June
94.7
95
96
91
95
96
July
93.0
92
94
95
92
94
August
94.1
95
90
94
97
95
September
85.1
86
89
92
84
81
October
81.2
75
80
76
86
84
November
73.5
80
74
84
71
December
66.2
69
74
63
59
Average
85.5
85.1
87.0
87.6
85.6
86.6
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
4.7
3
6
7
3
8
February
5.5
7
7
7
3
7
March
7.6
8
7
9
9
8
April
11.9
12
12
12
10
13
May
17.0
20
18
17
15
15
June
21.3
19
23
21
22
22
July
21.9
21
21
22
24
19
August
21.8
22
20
23
21
24
September
18.2
19
21
17
19
18
October
13.4
13
13
15
14
13
November
8.6
7
10
9
10
December
5.3
5
2
5
6
Average
13.3
14.4
13.2
13.7
12.6
13.7
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
0.4
-2
2
2
-1
4
February
0.6
3
1
1
-3
3
March
0.5
3
0
-2
0
1
April
2.5
4
3
1
1
2
May
7.5
10
7
7
7
6
June
11.5
11
11
12
12
12
July
12.6
12
13
13
14
11
August
12.7
13
13
13
12
13
September
10.4
11
13
10
10
10
October
7.5
7
7
9
8
8
November
4.2
2
7
4
6
December
1.6
1
-2
0
4
Average
6.1
7.1
6.1
6.2
5.3
6.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.8
18
24
9
28
16
February
17.7
27
8
20
9
29
March
12.4
7
20
1
10
10
April
8.4
18
3
8
5
9
May
9.0
8
1
8
20
8
June
7.2
11
2
8
4
9
July
10.0
13
17
7
7
13
August
10.1
8
13
5
7
10
September
10.7
10
5
10
9
8
October
12.5
9
20
5
9
10
November
14.5
30
10
15
6
December
19.3
22
17
18
23
Average
11.3
12.0
11.8
8.0
10.7
11.5
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
7.7
9
7
9
6
8
February
8.6
9
9
10
8
10
March
8.2
8
7
7
8
9
April
8.7
8
9
9
9
9
May
7.8
8
8
8
7
9
June
7.1
7
7
7
7
6
July
7.6
7
7
9
7
9
August
6.5
7
7
6
8
5
September
7.0
6
6
8
6
7
October
7.5
7
10
6
7
6
November
7.0
7
9
7
7
December
7.2
9
5
7
7
Average
7.6
7.4
7.6
7.8
7.1
7.7
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
255°
229°
265°
313°
250°
February
233°
278°
250°
066°
245°
March
115°
247°
161°
270°
253°
April
137°
057°
310°
318°
279°
May
098°
250°
261°
239°
287°
June
247°
278°
252°
269°
091°
July
242°
234°
264°
270°
258°
August
224°
245°
258°
290°
165°
September
113°
216°
101°
232°
260°
October
198°
210°
220°
234°
159°
November
098°
140°
251°
233°
December
244°
050°
166°
139°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.