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
90.5
94
92
84
94
96
February
85.9
86
86
95
82
95
March
88.5
94
81
86
97
84
April
93.7
95
92
92
96
86
May
94.3
90
89
95
100
97
June
97.0
100
98
97
93
99
July
97.7
96
99
98
96
97
August
97.7
100
98
98
98
99
September
98.3
99
100
100
99
October
94.8
95
99
94
93
November
94.7
94
99
88
98
December
93.1
85
96
97
92
Average
94.2
94.6
92.6
94.8
94.7
95.2
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
9.7
11
13
8
12
9
February
11.1
14
10
11
12
12
March
13.0
15
13
8
11
14
April
18.0
21
17
19
17
12
May
22.2
21
20
23
24
22
June
27.0
30
26
26
25
27
July
29.7
32
31
29
30
29
August
30.2
31
31
30
31
30
September
26.5
28
26
25
28
October
21.3
23
20
19
24
November
17.2
18
18
17
16
December
12.8
14
15
12
14
Average
20.1
21.8
20.3
19.5
19.6
20.2
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
3.8
5
6
3
5
4
February
4.5
7
4
4
4
5
March
5.4
7
7
2
4
7
April
8.7
12
9
9
7
6
May
13.1
12
12
12
14
13
June
18.3
20
17
18
17
18
July
20.2
22
20
19
21
20
August
20.6
21
22
21
21
20
September
17.2
18
17
16
19
October
13.2
14
13
12
16
November
9.9
11
11
10
8
December
6.9
8
9
7
8
Average
11.9
13.1
12.4
11.5
11.4
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
24.4
29
9
25
24
29
February
19.0
7
23
22
20
19
March
18.4
14
21
29
27
20
April
10.3
8
18
12
11
23
May
6.4
7
11
2
6
8
June
3.7
0
4
7
11
2
July
2.3
2
2
2
3
1
August
1.1
1
1
1
0
1
September
4.2
3
6
5
1
October
7.5
7
9
9
8
November
10.8
19
5
9
12
December
19.1
15
19
22
13
Average
9.5
7.5
10.3
10.3
11.2
9.6
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
9.0
10
8
10
8
10
February
9.3
8
11
9
9
10
March
9.0
7
9
9
9
10
April
8.9
9
8
9
10
15
May
9.0
9
10
9
9
9
June
9.3
12
10
10
8
8
July
10.8
12
10
13
10
13
August
11.4
12
12
11
10
11
September
10.3
12
9
11
11
October
8.6
9
10
11
6
November
8.1
8
9
8
7
December
8.4
10
9
9
8
Average
9.5
10.0
9.7
9.8
9.5
9.5
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
051°
026°
344°
224°
029°
February
264°
337°
018°
018°
302°
March
037°
018°
014°
359°
027°
April
055°
325°
360°
012°
043°
May
057°
047°
030°
018°
338°
June
057°
058°
028°
357°
324°
July
048°
052°
039°
031°
041°
August
040°
055°
032°
036°
038°
September
058°
023°
039°
038°
October
051°
038°
036°
284°
November
243°
036°
018°
043°
December
298°
040°
225°
041°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.