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
77.0
87
87
79
78
65
February
73.4
57
79
82
84
83
March
77.9
82
74
86
82
87
April
90.6
88
93
96
95
100
May
88.0
91
92
94
79
89
June
93.7
97
89
93
95
97
July
94.3
93
93
95
97
94
August
97.2
97
97
96
99
99
September
92.2
92
95
93
90
October
86.1
78
88
88
92
November
79.0
92
83
82
74
December
68.4
63
73
63
52
Average
86.9
88.7
87.3
90.3
88.1
87.2
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
5.0
5
7
7
4
7
February
5.3
7
7
7
3
7
March
7.3
9
7
9
7
8
April
11.4
12
12
11
9
9
May
15.2
19
15
15
12
14
June
19.1
18
20
18
19
20
July
20.0
20
20
20
22
18
August
21.1
21
20
23
20
23
September
18.1
21
18
19
18
October
13.8
13
15
14
14
November
8.7
8
10
10
10
December
5.8
6
4
6
6
Average
12.8
13.6
12.8
13.2
12.0
13.3
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
2.5
1
3
4
1
6
February
2.5
4
3
4
-1
5
March
3.3
5
3
1
2
6
April
5.7
6
5
5
4
9
May
9.8
12
9
9
8
8
June
13.4
13
13
12
13
13
July
15.2
14
15
15
15
13
August
15.8
15
15
16
14
16
September
13.1
15
11
13
12
October
10.2
10
11
10
10
November
5.7
4
6
6
6
December
3.3
3
0
2
4
Average
8.5
8.6
7.9
7.9
7.2
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.5
11
12
11
7
15
February
12.9
20
4
21
0
24
March
8.6
5
15
2
4
9
April
5.3
10
6
3
4
100
May
4.4
5
2
5
11
3
June
4.4
5
1
4
3
4
July
4.7
5
8
5
2
5
August
4.0
5
4
1
3
3
September
8.2
6
14
4
4
October
12.8
19
6
16
14
November
13.1
17
14
16
3
December
14.0
18
10
17
10
Average
7.6
7.5
8.2
6.9
6.5
7.1
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
13.1
14
13
14
12
14
February
14.2
14
13
17
14
17
March
13.2
13
14
10
13
15
April
13.2
13
13
13
14
12
May
12.5
12
14
12
12
13
June
11.3
12
11
11
10
11
July
12.4
12
14
13
12
12
August
11.6
12
12
10
13
10
September
11.9
11
12
11
12
October
13.5
15
13
13
13
November
12.6
13
14
12
13
December
12.6
14
11
12
11
Average
12.6
12.4
12.7
12.3
12.1
12.5
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
260°
243°
275°
248°
238°
February
231°
284°
251°
130°
237°
March
138°
261°
108°
261°
229°
April
235°
074°
318°
325°
100°
May
089°
001°
276°
267°
303°
June
274°
327°
266°
324°
124°
July
259°
251°
288°
306°
270°
August
245°
265°
316°
295°
216°
September
216°
019°
264°
258°
October
242°
222°
234°
198°
November
182°
174°
268°
225°
December
257°
114°
203°
161°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.