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
74.8
77
84
78
76
57
February
76.0
87
81
90
81
56
March
79.6
87
79
81
67
91
April
91.5
94
96
93
95
99
May
94.2
96
93
98
95
90
June
90.9
93
97
91
80
93
July
87.8
90
88
93
88
86
August
90.6
88
94
94
91
81
September
89.7
94
88
98
84
87
October
77.7
69
78
89
80
76
November
77.0
79
84
65
73
83
December
82.7
77
97
86
86
Average
85.0
87.0
87.0
89.1
83.3
82.5
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
4
3
2
4
February
6.2
6
7
5
9
6
March
14.4
15
17
13
14
15
April
20.8
22
20
22
19
21
May
27.3
28
27
28
26
26
June
31.6
33
34
31
30
32
July
32.0
33
33
32
31
31
August
30.6
32
31
30
30
31
September
27.6
26
28
29
26
27
October
19.7
20
23
19
18
20
November
11.4
14
10
12
11
12
December
3.4
1
3
6
3
Average
19.3
21.0
19.6
19.3
18.5
18.8
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
-7.0
-7
-7
-7
-9
-6
February
-5.9
-4
-3
-6
-3
-3
March
3.7
4
5
3
5
4
April
10.5
12
10
11
10
10
May
16.8
18
17
17
16
16
June
21.7
23
23
22
21
22
July
24.4
25
25
24
24
24
August
23.2
25
24
23
22
23
September
18.6
19
20
18
19
18
October
9.7
10
12
10
9
9
November
2.0
5
0
3
2
3
December
-6.0
-7
-7
-4
-7
Average
9.8
11.7
9.8
9.7
9.3
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.8
3
2
4
1
0
February
4.0
3
3
4
4
11
March
2.1
1
1
5
2
3
April
3.2
2
5
1
6
0
May
3.6
4
5
4
3
6
June
4.0
5
3
3
4
0
July
8.3
10
13
9
10
6
August
8.5
12
6
6
5
10
September
4.8
7
6
0
13
9
October
5.4
5
1
7
12
2
November
4.1
8
3
6
6
5
December
1.6
8
0
1
0
Average
4.4
5.5
4.6
4.0
5.6
4.3
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
6.8
7
7
6
7
5
February
7.3
6
7
8
7
7
March
8.4
8
8
8
8
10
April
9.2
9
9
9
9
10
May
8.8
8
8
8
10
8
June
7.7
7
8
8
8
8
July
7.1
7
8
7
7
6
August
6.5
6
6
7
6
6
September
6.8
6
6
7
7
7
October
6.6
6
6
8
6
7
November
7.1
7
8
6
7
7
December
7.7
8
8
7
8
Average
7.5
7.2
7.4
7.3
7.4
7.4
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
331°
317°
326°
333°
333°
February
019°
240°
323°
300°
041°
March
221°
263°
012°
253°
283°
April
126°
265°
223°
185°
293°
May
255°
151°
246°
273°
150°
June
167°
214°
111°
094°
156°
July
169°
124°
128°
122°
152°
August
108°
148°
308°
124°
123°
September
057°
196°
222°
043°
355°
October
294°
291°
304°
340°
299°
November
303°
327°
321°
314°
331°
December
337°
317°
313°
322°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.