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
73.6
81
87
70
72
73
February
84.0
81
74
92
76
95
March
89.5
92
86
90
93
93
April
94.9
96
94
97
94
99
May
95.7
95
94
97
97
99
June
95.3
96
97
99
92
93
July
95.4
97
95
98
96
94
August
96.5
99
95
99
93
97
September
92.3
96
94
93
93
October
89.8
86
92
94
92
November
76.9
82
79
79
80
December
68.4
61
72
55
67
Average
90.2
93.5
89.4
92.5
88.5
91.4
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
5.4
5
7
7
4
8
February
7.2
10
8
9
6
9
March
10.1
12
9
11
10
10
April
13.9
15
13
13
11
16
May
18.6
21
18
19
15
17
June
23.0
21
25
23
24
23
July
23.3
23
22
24
24
21
August
24.0
24
22
27
21
26
September
19.8
23
19
20
20
October
15.2
15
17
15
14
November
9.1
9
10
9
11
December
6.1
7
2
6
7
Average
14.9
16.3
14.8
15.4
13.6
15.1
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
1.0
1
3
3
0
3
February
1.1
5
1
3
-1
3
March
2.2
5
3
1
2
2
April
4.1
7
4
3
2
4
May
8.0
11
8
8
6
6
June
12.2
11
13
11
13
13
July
13.0
13
13
13
14
11
August
13.5
14
13
14
13
15
September
9.9
12
9
11
9
October
8.1
9
9
7
8
November
3.7
3
4
5
5
December
2.0
4
-3
1
3
Average
6.7
8.2
7.1
6.4
6.0
6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
27.1
23
24
34
28
23
February
22.0
27
17
38
19
28
March
18.3
18
30
6
17
17
April
13.4
21
18
17
17
2
May
10.8
12
8
11
19
7
June
10.4
19
5
9
8
12
July
13.9
15
28
11
8
18
August
11.6
8
20
5
20
10
September
12.5
5
22
5
8
October
20.6
30
11
21
18
November
17.1
31
13
13
11
December
28.6
41
13
32
26
Average
15.8
16.7
19.7
14.3
16.1
13.7
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
10.0
11
11
11
9
10
February
10.5
11
9
14
9
14
March
10.0
9
10
8
10
11
April
9.5
9
9
10
10
9
May
8.4
8
8
8
9
9
June
7.9
8
8
8
7
8
July
8.2
8
9
8
8
8
August
7.7
8
8
7
9
8
September
7.6
7
8
7
7
October
9.2
9
8
9
10
November
8.6
10
9
8
9
December
9.0
11
6
8
8
Average
8.8
8.6
8.9
8.7
8.4
8.9
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
243°
233°
263°
237°
226°
February
235°
270°
242°
121°
234°
March
169°
244°
099°
257°
221°
April
234°
085°
341°
311°
348°
May
109°
012°
268°
251°
308°
June
261°
355°
284°
308°
220°
July
242°
236°
291°
262°
260°
August
229°
255°
352°
270°
210°
September
189°
235°
242°
222°
October
226°
213°
206°
201°
November
223°
176°
234°
204°
December
240°
142°
211°
169°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.