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
95.4
96
89
94
94
97
February
94.6
90
91
96
97
97
March
97.5
94
98
100
95
99
April
96.9
95
95
99
96
95
May
96.7
98
93
95
95
98
June
96.6
93
99
97
98
93
July
97.6
99
96
99
96
97
August
95.4
91
98
92
98
September
96.6
97
96
96
98
October
95.0
94
99
93
99
November
97.6
94
98
99
99
December
96.8
96
94
95
97
Average
96.4
95.1
94.5
97.1
95.4
97.0
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
11.7
13
12
12
10
14
February
14.4
16
13
15
15
16
March
16.9
17
17
17
16
17
April
19.6
20
21
20
18
20
May
23.4
23
24
26
22
25
June
28.7
27
30
31
29
27
July
31.9
32
32
34
31
31
August
31.3
31
32
30
31
September
27.0
29
26
27
27
October
22.2
24
24
21
20
November
15.8
16
18
15
18
December
12.6
14
11
13
12
Average
21.3
20.9
21.9
22.4
20.6
21.3
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
3.5
4
4
3
3
5
February
5.0
7
4
5
6
5
March
6.7
9
7
6
6
7
April
9.1
10
10
9
7
9
May
13.1
13
14
15
11
14
June
18.0
17
18
20
19
16
July
20.7
21
22
22
20
20
August
19.9
20
22
19
20
September
16.2
18
17
17
16
October
12.9
15
15
11
10
November
7.8
8
9
7
9
December
4.4
6
5
3
5
Average
11.5
11.4
12.0
12.5
10.7
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.4
8
2
0
7
8
February
7.4
7
5
4
6
8
March
5.0
13
1
7
2
4
April
9.0
5
3
8
9
14
May
6.8
14
9
1
7
6
June
2.6
3
1
0
6
3
July
0.7
1
0
0
2
0
August
1.4
2
1
2
2
September
4.1
5
2
8
4
October
6.1
2
3
7
6
November
9.7
8
11
11
9
December
9.3
5
15
9
14
Average
5.3
6.9
3.4
3.6
5.9
5.9
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
12.6
11
13
12
13
9
February
11.6
12
11
15
9
12
March
11.5
13
11
9
12
11
April
11.9
15
12
11
11
8
May
10.6
10
11
10
11
10
June
10.7
11
10
11
11
12
July
11.1
11
11
11
12
11
August
11.0
12
11
11
12
September
10.1
9
12
8
10
October
10.8
10
8
12
13
November
10.8
11
11
11
9
December
10.3
11
10
10
11
Average
11.1
11.6
11.1
11.0
10.8
10.7
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
345°
340°
348°
334°
025°
February
333°
357°
329°
099°
326°
March
160°
309°
127°
338°
317°
April
344°
323°
303°
347°
201°
May
272°
338°
301°
294°
305°
June
295°
317°
243°
229°
306°
July
315°
290°
316°
307°
310°
August
304°
326°
321°
308°
September
174°
325°
305°
311°
October
144°
150°
011°
340°
November
335°
357°
348°
033°
December
335°
017°
343°
351°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.