Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
92.4
93
83
97
91
92
February
91.6
99
88
91
90
92
March
94.6
89
95
89
97
95
April
96.8
95
96
100
96
May
96.4
95
95
98
97
June
94.7
95
96
92
97
July
95.4
94
93
94
94
August
95.0
94
94
95
95
September
97.4
100
94
96
99
October
95.6
97
95
95
96
November
92.5
95
90
99
96
December
83.7
92
79
95
91
Average
94.0
92.8
93.6
93.0
95.1
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 3⅛ mi 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
13.5
12
16
13
13
14
February
17.5
18
19
17
15
15
March
20.2
20
21
21
22
22
April
23.6
23
23
23
22
May
27.3
26
28
27
26
June
30.2
30
32
30
30
July
31.9
32
33
31
32
August
31.6
33
31
31
32
September
29.8
30
29
28
28
October
24.5
24
24
25
25
November
18.4
19
19
18
21
December
15.1
15
16
19
14
Average
22.8
16.4
24.0
23.9
23.5
23.5
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
2.9
1
6
1
3
5
February
6.3
6
8
4
4
5
March
8.3
9
8
8
9
12
April
10.4
11
11
10
10
May
15.8
16
17
15
14
June
19.4
19
20
20
19
July
21.7
22
22
22
22
August
21.7
21
22
23
22
September
18.7
18
17
18
19
October
12.9
12
9
15
14
November
5.9
6
7
4
8
December
4.8
4
8
8
2
Average
11.6
5.3
12.4
12.2
12.6
12.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.1
8
8
7
6
9
February
10.3
10
13
12
7
17
March
7.3
12
9
6
7
14
April
5.1
10
4
2
6
May
4.6
5
6
1
5
June
5.5
2
7
9
5
July
2.9
2
3
6
3
August
4.2
2
6
4
4
September
3.4
1
6
7
4
October
5.8
3
3
5
7
November
5.3
8
8
1
3
December
8.9
6
16
7
5
Average
6.1
9.6
5.4
6.3
5.1
6.6
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
5.9
6
6
6
6
6
February
6.1
6
6
6
6
7
March
6.4
6
6
7
6
6
April
6.0
6
6
6
6
May
5.3
5
6
5
6
June
4.6
5
4
5
5
July
4.3
4
5
4
4
August
4.2
4
4
4
4
September
4.7
4
5
4
5
October
5.2
6
5
5
5
November
5.3
5
6
5
5
December
5.6
5
6
5
6
Average
5.3
6.0
5.2
5.3
5.0
5.3
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
286°
255°
316°
270°
357°
February
055°
239°
241°
357°
298°
March
345°
257°
232°
069°
247°
April
027°
233°
258°
302°
May
056°
215°
127°
355°
June
267°
010°
080°
228°
July
249°
230°
230°
198°
August
292°
220°
094°
241°
September
062°
048°
041°
061°
October
355°
006°
030°
062°
November
049°
038°
347°
037°
December
287°
246°
233°
286°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.