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
42.3
54
35
57
36
40
February
61.9
54
61
71
73
74
March
81.7
87
84
97
78
80
April
88.4
83
82
89
83
97
May
93.5
97
97
91
83
93
June
94.3
96
98
92
96
92
July
90.8
89
94
87
98
96
August
90.1
95
92
95
80
89
September
87.7
95
96
82
82
85
October
69.7
74
70
70
86
59
November
40.6
39
58
40
38
33
December
33.7
31
28
37
34
Average
78.6
82.6
80.4
80.8
77.3
78.1
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
-2.9
-3
1
0
-3
3
February
0.6
4
1
3
-3
4
March
5.7
8
6
6
4
7
April
11.7
13
12
9
10
11
May
17.6
21
18
16
15
15
June
23.0
23
23
23
25
24
July
23.0
25
23
22
27
22
August
23.3
25
25
26
20
23
September
18.1
23
22
14
15
19
October
11.3
11
11
12
11
12
November
4.3
4
3
3
5
5
December
0.3
1
-4
-2
1
Average
11.6
13.9
12.0
11.3
10.3
12.2
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
-6.9
-8
-2
-4
-6
0
February
-5.7
-1
-4
-2
-10
-1
March
-3.7
0
-2
-4
-3
-1
April
2.2
5
3
1
2
1
May
7.0
9
7
5
6
5
June
12.3
12
12
13
14
14
July
13.6
15
12
13
17
12
August
13.3
14
15
15
12
13
September
8.9
13
11
6
7
9
October
4.8
5
4
5
4
7
November
0.6
1
-1
0
1
2
December
-3.0
-2
-7
-6
-2
Average
4.1
5.9
4.3
3.7
3.0
4.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
36.6
45
35
37
46
25
February
28.0
23
34
31
23
24
March
15.8
6
23
3
17
10
April
14.5
19
16
18
18
12
May
9.0
5
4
12
22
14
June
6.7
6
7
10
4
4
July
8.8
10
7
10
3
6
August
7.7
5
7
4
17
9
September
8.3
4
3
7
14
4
October
16.5
10
19
13
8
13
November
20.5
25
25
25
23
18
December
34.7
40
35
45
18
Average
14.8
12.0
15.1
14.4
17.4
11.6
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
9.1
9
10
10
8
10
February
9.1
9
9
11
8
11
March
8.8
9
10
7
9
9
April
9.1
9
8
9
9
10
May
7.6
6
6
8
9
9
June
6.9
6
6
6
6
7
July
7.3
7
8
7
6
7
August
6.5
6
7
6
7
6
September
7.6
7
7
7
8
8
October
8.8
7
10
8
10
8
November
8.3
9
9
7
9
8
December
8.7
9
8
8
10
Average
8.0
7.5
7.9
7.7
8.0
8.4
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
198°
181°
264°
166°
241°
February
189°
267°
222°
297°
228°
March
156°
228°
330°
251°
246°
April
238°
061°
336°
253°
283°
May
100°
035°
271°
233°
329°
June
255°
360°
277°
350°
076°
July
266°
262°
291°
137°
264°
August
273°
191°
081°
221°
017°
September
130°
189°
302°
312°
229°
October
208°
234°
233°
189°
172°
November
225°
205°
159°
210°
212°
December
220°
166°
233°
160°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.