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
99.7
100
100
100
98
100
February
99.6
100
100
100
99
100
March
99.6
100
100
100
99
100
April
99.7
99
100
100
100
100
May
99.5
98
100
100
100
100
June
99.6
100
100
98
99
100
July
99.9
100
100
100
100
100
August
99.8
100
100
100
100
100
September
99.9
100
100
100
100
100
October
99.6
99
100
100
99
99
November
99.5
100
100
98
100
December
99.8
100
100
100
99
Average
99.7
99.4
99.9
99.7
99.2
99.7
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
15.4
17
16
15
16
16
February
16.2
18
16
16
17
17
March
17.5
19
19
16
17
16
April
20.0
21
19
20
19
20
May
23.7
24
22
25
24
24
June
29.3
30
28
32
30
27
July
32.5
34
34
33
32
31
August
32.4
34
32
32
34
32
September
28.8
29
29
30
29
29
October
24.6
26
27
25
23
23
November
20.6
22
21
21
20
December
17.0
18
20
16
17
Average
23.4
25.1
23.5
23.9
23.1
22.6
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
8.8
10
9
9
10
9
February
9.2
11
8
9
10
10
March
10.5
12
10
9
9
10
April
12.4
13
11
12
11
13
May
16.0
16
15
16
16
16
June
21.1
22
20
23
21
19
July
24.7
25
25
25
24
27
August
24.5
26
24
24
25
25
September
21.0
21
21
22
21
21
October
17.1
18
19
17
15
16
November
13.8
15
14
14
13
December
11.0
12
13
10
11
Average
16.0
17.3
15.7
16.0
15.4
15.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.5
8
9
7
7
0
February
5.3
9
1
8
5
0
March
6.3
5
4
9
11
12
April
4.3
7
13
4
6
3
May
3.9
7
12
2
4
1
June
1.6
2
4
1
2
3
July
0.4
0
1
0
2
2
August
1.0
1
1
2
1
2
September
2.9
6
3
4
5
2
October
4.2
4
1
2
15
3
November
6.7
4
13
9
4
December
6.3
5
12
8
6
Average
3.8
4.5
4.9
4.5
5.7
2.8
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
9.1
9
8
10
9
9
February
10.2
11
10
11
9
12
March
9.9
10
10
10
9
9
April
9.8
10
9
11
10
9
May
10.0
10
8
10
11
10
June
10.4
11
9
10
10
10
July
11.3
12
10
11
12
12
August
10.1
10
11
9
10
11
September
8.8
9
10
8
8
8
October
8.7
9
9
9
7
9
November
8.0
9
7
8
7
December
9.0
8
8
9
9
Average
9.7
10.1
9.3
9.7
9.5
9.6
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
003°
358°
357°
088°
357°
February
020°
348°
349°
341°
354°
March
001°
350°
192°
343°
348°
April
341°
343°
326°
324°
340°
May
333°
321°
345°
348°
335°
June
352°
348°
351°
347°
352°
July
354°
344°
349°
350°
346°
August
350°
355°
350°
345°
350°
September
338°
347°
326°
338°
348°
October
223°
352°
347°
326°
357°
November
355°
009°
174°
359°
December
004°
176°
354°
116°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.