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
72.2
83
83
53
67
84
February
85.5
82
84
88
89
91
March
92.9
95
94
97
95
91
April
95.3
96
94
90
97
95
May
93.5
88
92
99
96
93
June
94.9
91
96
96
95
95
July
95.8
95
96
99
93
97
August
97.0
95
96
97
97
97
September
93.8
99
93
89
96
October
86.3
95
88
92
86
November
79.6
83
82
65
93
December
71.4
75
74
65
77
Average
90.0
91.2
91.6
90.2
88.4
92.0
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
7.5
8
8
6
7
10
February
10.8
11
10
12
11
13
March
13.7
14
14
15
14
13
April
16.8
17
16
16
16
20
May
20.2
19
21
23
18
21
June
25.0
23
28
26
25
23
July
27.1
26
27
28
24
27
August
27.1
27
27
30
23
28
September
24.1
28
22
24
25
October
18.7
21
21
18
15
November
11.8
12
14
9
14
December
8.7
10
5
9
9
Average
17.8
18.1
18.4
18.5
16.3
18.2
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
2
3
1
2
3
February
2.4
5
1
2
3
5
March
3.7
5
4
3
1
4
April
5.1
6
5
5
3
7
May
8.8
9
9
10
8
9
June
13.1
13
14
14
14
12
July
14.4
15
14
14
14
14
August
14.3
14
15
15
13
15
September
11.5
14
11
13
12
October
8.9
10
12
6
9
November
4.5
6
6
3
5
December
3.0
5
-1
3
4
Average
7.7
8.5
8.3
7.9
6.7
8.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
27.3
20
28
17
39
24
February
24.9
35
11
30
25
34
March
24.7
32
27
16
17
23
April
17.1
21
14
24
15
10
May
21.4
41
11
5
35
14
June
15.7
21
12
19
17
16
July
9.7
8
10
3
26
2
August
10.8
6
14
11
13
16
September
14.5
7
16
23
13
October
24.0
26
20
17
39
November
26.7
41
22
26
10
December
30.2
24
8
27
41
Average
19.4
22.4
17.4
15.3
22.8
18.8
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
9.3
10
11
7
10
10
February
9.7
9
8
10
10
14
March
9.6
9
11
8
9
10
April
8.1
9
9
9
9
7
May
7.9
8
9
7
11
8
June
7.0
7
6
7
6
8
July
7.7
7
9
7
9
8
August
7.4
7
8
7
8
8
September
7.4
7
8
7
7
October
8.7
9
8
9
10
November
8.8
12
9
8
7
December
10.1
10
7
10
11
Average
8.3
8.0
8.8
7.7
8.6
8.8
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
231°
246°
258°
253°
215°
February
224°
033°
234°
157°
237°
March
220°
236°
074°
305°
323°
April
255°
304°
308°
036°
172°
May
238°
007°
339°
237°
034°
June
279°
358°
247°
276°
233°
July
250°
241°
020°
241°
294°
August
252°
260°
005°
273°
245°
September
223°
247°
235°
281°
October
207°
200°
201°
229°
November
231°
216°
309°
170°
December
228°
052°
220°
223°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.