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
78.9
85
85
67
76
81
February
89.8
89
88
93
90
94
March
91.4
92
88
93
93
97
April
95.0
98
92
96
94
99
May
94.7
87
95
98
95
100
June
96.4
94
98
99
92
97
July
96.3
97
96
98
91
97
August
95.4
95
94
98
93
98
September
94.3
96
98
94
95
October
94.7
95
97
93
98
November
86.2
89
92
76
91
December
77.2
75
69
76
85
Average
92.2
92.7
92.0
93.7
89.9
95.1
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
6.2
6
8
7
5
8
February
8.9
11
9
10
8
10
March
11.6
13
11
13
11
11
April
15.0
15
14
14
12
18
May
19.5
21
19
21
16
19
June
23.8
21
26
24
24
23
July
24.4
24
24
25
23
23
August
24.6
25
23
27
21
27
September
20.8
24
20
21
22
October
16.4
17
18
16
15
November
10.3
10
12
9
12
December
7.2
9
3
8
8
Average
16.0
17.1
16.1
16.5
14.6
16.2
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
1.8
1
3
2
1
3
February
2.4
6
2
3
1
4
March
3.5
6
4
1
2
3
April
5.2
7
4
5
2
5
May
9.3
11
9
9
6
6
June
13.4
12
13
11
14
13
July
14.3
14
13
13
14
12
August
14.4
15
14
14
13
16
September
10.7
12
10
11
10
October
8.9
10
9
7
9
November
4.4
5
5
3
5
December
2.8
5
-2
3
2
Average
7.7
9.0
7.8
7.0
6.2
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.8
16
20
15
20
10
February
14.1
20
11
21
17
19
March
12.4
11
23
4
9
9
April
7.4
13
11
9
10
2
May
6.4
10
3
5
12
2
June
4.0
7
1
5
4
5
July
5.5
7
7
3
10
7
August
4.6
4
10
1
8
3
September
7.0
4
13
4
7
October
10.3
12
7
12
15
November
12.2
21
8
14
3
December
19.0
20
10
12
27
Average
8.8
10.0
10.4
7.4
10.1
7.7
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
7.0
7
8
6
7
7
February
7.9
7
7
11
7
11
March
7.5
7
8
6
8
9
April
6.7
7
7
8
7
6
May
5.9
5
6
5
7
6
June
5.7
5
6
5
5
6
July
5.8
5
6
6
6
6
August
5.4
5
5
5
6
6
September
5.2
5
5
5
5
October
6.4
6
5
6
7
November
6.2
7
7
5
6
December
6.7
8
5
6
7
Average
6.3
5.9
6.4
6.1
6.1
6.6
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
227°
220°
238°
240°
212°
February
207°
260°
226°
136°
228°
March
181°
222°
090°
268°
201°
April
235°
035°
357°
316°
035°
May
241°
006°
265°
232°
352°
June
270°
006°
287°
301°
247°
July
238°
231°
300°
270°
271°
August
229°
249°
341°
270°
234°
September
157°
231°
217°
241°
October
196°
179°
197°
211°
November
210°
177°
227°
192°
December
219°
112°
197°
184°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.