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
84.2
0
100
58
84
February
92.6
92
100
100
96
100
March
87.4
74
98
100
100
77
April
98.4
100
100
99
100
May
97.6
100
100
100
100
June
97.3
100
99
95
98
July
98.1
100
100
97
97
August
100.0
100
100
100
100
September
95.7
100
100
91
October
89.4
100
89
100
78
November
84.8
100
84
100
93
December
59.0
20
0
100
73
Average
91.1
81.3
93.5
95.4
96.2
90.4
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
1.7
-1
3
-3
5
February
5.2
8
6
9
-1
7
March
7.2
7
13
6
7
12
April
14.7
14
18
13
17
May
21.7
22
21
19
17
June
25.9
25
27
24
24
July
26.7
25
26
26
28
August
27.1
30
28
21
30
September
21.3
17
23
26
October
15.5
18
16
14
16
November
8.0
11
11
10
7
December
3.2
1
15
5
3
Average
15.2
7.1
15.9
17.4
15.6
15.7
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
-2.9
-1
-2
-5
1
February
2.7
6
3
5
-4
5
March
4.2
5
9
4
4
9
April
9.9
12
15
8
10
May
17.1
19
17
17
14
June
21.4
21
22
21
22
July
21.4
22
23
21
21
August
21.9
25
23
19
26
September
16.4
15
16
21
October
10.4
12
8
6
14
November
5.2
9
6
6
4
December
1.3
0
5
3
1
Average
11.3
5.3
12.6
12.5
11.3
12.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
0
8
11
0
February
4.0
0
0
5
0
0
March
5.7
11
0
0
13
0
April
4.6
6
0
8
0
May
2.3
0
0
8
7
June
4.0
0
0
9
7
July
2.4
0
0
9
0
August
1.1
0
0
0
0
September
4.8
0
0
0
October
2.4
0
2
0
2
November
0.9
0
0
0
0
December
10.3
0
0
0
10
Average
3.6
6.7
0.3
1.5
5.6
2.3
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
7.8
4
14
5
7
February
5.9
0
2
8
5
7
March
6.6
0
10
7
8
8
April
8.4
13
2
7
5
May
7.6
6
6
8
10
June
7.3
8
8
8
8
July
6.9
8
1
6
8
August
6.0
5
5
5
10
September
5.3
8
3
7
October
5.4
0
5
7
6
November
5.6
0
7
6
5
December
4.9
0
7
8
5
Average
5.7
5.4
7.1
6.4
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
161°
289°
079°
266°
February
360°
296°
272°
116°
188°
March
360°
170°
355°
326°
358°
April
329°
360°
260°
330°
May
143°
010°
288°
330°
June
251°
012°
316°
127°
July
298°
243°
287°
303°
August
061°
014°
303°
070°
September
138°
121°
150°
October
360°
293°
111°
152°
November
360°
143°
146°
150°
December
360°
116°
245°
122°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.