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
74.5
82
74
76
83
58
February
76.5
64
73
85
74
88
March
82.2
72
75
84
88
96
April
90.8
91
81
91
98
97
May
90.1
83
86
91
93
98
June
91.1
94
91
95
79
90
July
91.6
91
88
92
86
89
August
94.8
93
96
94
98
September
90.5
93
93
94
85
October
85.0
78
84
85
88
November
75.5
82
70
69
77
December
64.3
61
67
54
63
Average
86.2
83.6
82.4
86.9
84.9
87.8
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
6.1
6
7
7
5
8
February
7.3
9
8
9
6
8
March
9.5
11
9
11
9
9
April
12.7
13
12
12
10
14
May
16.8
20
16
17
14
16
June
20.1
19
22
20
21
21
July
21.2
21
21
21
22
19
August
21.8
21
24
20
24
September
18.9
22
19
20
19
October
14.8
15
16
15
14
November
9.8
10
11
10
11
December
6.9
8
4
7
7
Average
13.9
14.0
14.2
14.5
13.0
14.2
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
3
0
4
February
2.0
5
2
3
0
4
March
2.8
5
3
2
2
3
April
4.4
6
4
4
2
4
May
8.0
11
8
8
7
6
June
11.8
11
12
11
12
13
July
13.5
14
14
13
15
12
August
13.8
13
14
14
15
September
11.2
13
11
12
11
October
9.2
10
10
9
9
November
4.8
5
5
6
5
December
2.7
4
-1
2
3
Average
7.2
7.5
7.6
7.2
6.7
7.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.7
22
25
13
17
20
February
20.4
26
12
35
15
32
March
15.5
14
28
13
11
7
April
13.8
29
16
17
12
4
May
9.7
14
10
15
18
3
June
11.1
15
8
17
6
12
July
14.6
23
27
12
8
16
August
11.3
15
8
14
11
September
15.5
16
29
6
9
October
19.8
32
15
17
19
November
24.6
50
22
13
10
December
21.5
25
22
19
23
Average
14.7
20.1
21.3
17.4
12.2
12.6
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
11.6
12
13
12
10
12
February
12.3
12
11
17
10
16
March
11.6
11
13
9
12
13
April
11.1
13
11
13
11
10
May
9.2
8
9
10
10
10
June
9.0
10
9
9
8
9
July
9.2
9
11
9
8
9
August
8.8
9
8
10
9
September
8.5
8
8
8
8
October
10.5
11
10
10
11
November
9.9
12
10
9
10
December
10.3
12
8
10
9
Average
10.0
10.4
10.6
10.0
9.5
10.3
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
242°
231°
262°
234°
224°
February
221°
270°
243°
137°
233°
March
231°
237°
079°
264°
221°
April
251°
007°
303°
348°
036°
May
079°
013°
272°
261°
328°
June
273°
352°
270°
347°
274°
July
251°
244°
286°
295°
257°
August
264°
347°
291°
240°
September
200°
288°
237°
228°
October
223°
210°
211°
200°
November
215°
184°
238°
206°
December
244°
160°
210°
179°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.