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
69.5
77
67
74
62
72
February
80.6
80
79
90
75
89
March
90.5
84
87
96
88
98
April
93.8
99
92
88
85
100
May
96.4
100
96
99
97
96
June
97.5
98
98
98
99
90
July
96.6
99
99
94
94
98
August
96.0
96
98
98
89
95
September
91.4
96
98
83
95
94
October
85.9
84
91
92
82
November
69.4
73
59
70
76
December
63.2
57
44
51
67
Average
89.1
93.5
88.5
88.4
86.2
90.0
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
2.4
2
5
3
1
5
February
4.6
9
4
6
2
7
March
8.9
11
9
9
7
10
April
14.5
16
13
11
12
16
May
19.7
23
19
19
17
17
June
25.2
25
24
25
26
24
July
25.5
27
26
24
27
25
August
25.7
27
26
27
21
26
September
20.5
24
24
17
19
21
October
14.8
15
16
14
14
November
7.4
6
6
8
8
December
3.4
4
0
1
4
Average
14.8
18.1
14.6
14.1
12.8
14.8
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
-3.5
-3
2
-2
-4
0
February
-2.4
3
-1
0
-6
0
March
0.0
3
0
-2
-1
0
April
4.0
6
5
3
2
2
May
8.9
11
8
8
8
6
June
13.9
14
13
14
14
15
July
14.8
16
15
14
17
13
August
15.1
16
16
17
13
15
September
10.5
13
12
8
9
10
October
6.3
7
6
5
8
November
2.5
1
2
3
3
December
-1.1
0
-4
-3
0
Average
6.2
8.7
6.3
5.7
4.7
6.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
25.8
30
21
28
33
16
February
20.8
30
19
21
29
17
March
11.1
11
18
3
14
7
April
10.6
11
14
16
17
1
May
7.9
1
9
6
11
8
June
4.5
5
6
4
3
8
July
6.1
4
5
8
4
4
August
6.1
4
6
3
12
9
September
7.6
3
4
7
6
8
October
10.5
14
3
3
14
November
14.0
24
15
15
10
December
24.1
34
35
21
15
Average
10.7
9.3
12.5
9.9
12.3
8.9
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
8.4
9
8
11
7
8
February
8.8
10
10
11
8
9
March
8.4
9
9
7
9
9
April
8.9
9
8
8
9
8
May
8.1
8
8
9
9
8
June
7.3
7
7
7
7
7
July
7.0
7
7
8
7
6
August
6.6
7
7
7
7
6
September
7.3
8
6
8
8
7
October
7.8
9
8
9
8
November
7.9
9
7
9
7
December
8.5
10
8
9
10
Average
7.8
8.1
8.0
8.1
7.9
7.5
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
254°
218°
271°
246°
251°
February
227°
273°
252°
288°
248°
March
137°
248°
333°
273°
215°
April
247°
024°
309°
277°
298°
May
112°
088°
279°
240°
314°
June
244°
343°
259°
312°
012°
July
267°
266°
294°
271°
264°
August
288°
225°
080°
262°
012°
September
107°
173°
273°
298°
219°
October
243°
240°
178°
178°
November
229°
145°
225°
227°
December
241°
122°
243°
142°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.