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
87.3
85
74
86
89
94
February
86.3
94
90
85
68
88
March
92.4
86
94
88
93
90
April
93.2
95
90
95
83
95
May
89.2
91
97
50
96
June
90.1
94
96
52
98
July
89.9
92
92
55
98
August
90.4
94
93
64
95
September
86.8
96
90
52
93
October
89.8
93
91
64
94
November
85.1
89
85
80
92
December
85.0
87
80
90
90
Average
89.2
90.2
90.6
90.5
68.7
93.9
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
16.9
17
19
16
16
18
February
20.2
19
23
20
17
18
March
22.4
23
23
23
23
24
April
25.5
26
26
26
25
26
May
29.2
27
30
29
28
June
31.2
30
33
29
31
July
32.6
34
33
29
34
August
32.6
34
32
32
33
September
30.6
30
30
31
30
October
26.8
26
25
27
27
November
20.8
22
22
20
23
December
18.1
18
19
22
17
Average
25.1
21.4
26.0
25.9
24.9
25.8
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
6.3
6
7
5
6
9
February
9.4
8
11
9
7
9
March
10.9
12
11
12
11
13
April
14.2
14
15
14
13
14
May
18.8
17
20
17
18
June
21.0
22
21
16
22
July
22.3
25
25
11
25
August
23.6
25
23
24
22
September
21.1
22
21
21
22
October
17.0
16
14
17
19
November
10.6
11
12
7
14
December
8.2
8
9
11
6
Average
14.7
10.1
15.8
15.4
13.4
16.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.6
8
8
5
6
4
February
7.0
8
12
4
14
7
March
4.5
6
6
8
4
5
April
3.9
6
6
2
2
5
May
3.4
9
1
1
3
June
3.4
6
4
3
1
July
3.4
4
8
4
2
August
5.5
7
14
3
4
September
6.8
5
9
8
5
October
3.3
3
0
6
3
November
7.3
10
9
7
10
December
6.9
14
6
5
1
Average
5.1
6.9
7.1
5.8
4.8
4.0
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
7.5
8
6
8
8
8
February
7.4
8
8
7
7
8
March
8.0
8
7
9
8
7
April
7.7
8
7
8
8
8
May
6.9
8
7
7
7
June
5.9
6
6
6
7
July
5.5
5
7
5
5
August
5.1
6
5
5
5
September
6.3
6
7
5
7
October
6.3
6
6
6
7
November
6.8
7
8
6
7
December
6.8
8
6
6
6
Average
6.7
7.7
6.6
6.9
6.4
6.7
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
271°
264°
323°
261°
303°
February
023°
256°
097°
320°
270°
March
256°
245°
204°
060°
179°
April
226°
163°
185°
236°
252°
May
038°
164°
151°
218°
June
243°
124°
194°
260°
July
244°
215°
212°
203°
August
199°
191°
166°
198°
September
041°
033°
043°
033°
October
014°
030°
330°
036°
November
015°
026°
346°
026°
December
330°
014°
243°
288°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.