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
76.3
74
86
68
77
68
February
93.6
98
93
92
96
99
March
96.9
98
95
97
98
98
April
99.2
100
100
100
100
May
99.6
99
99
100
99
June
100.0
100
100
100
100
July
99.5
100
100
100
100
August
94.6
100
100
91
85
September
95.4
100
100
97
73
October
94.2
99
100
83
85
November
86.7
99
92
57
93
December
73.9
86
77
68
76
Average
92.8
90.3
96.6
94.7
89.6
90.2
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
15.1
15
15
17
15
14
February
17.6
17
16
20
18
20
March
20.1
20
16
23
20
20
April
25.4
25
26
27
24
May
29.5
29
30
31
31
June
34.9
31
36
37
35
July
38.4
39
38
40
38
August
37.6
37
39
38
38
September
33.7
32
36
35
34
October
27.5
28
29
25
30
November
19.8
21
17
19
19
December
14.6
17
13
13
15
Average
25.2
17.5
25.4
27.4
26.6
26.5
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
5.9
7
6
4
6
5
February
6.1
8
4
5
7
6
March
8.6
9
8
10
8
9
April
11.5
11
11
11
12
May
14.4
14
15
15
15
June
18.9
17
19
20
19
July
22.1
22
22
24
21
August
21.4
22
22
21
23
September
18.6
18
21
19
20
October
13.1
14
15
13
15
November
7.7
8
5
9
7
December
5.6
7
5
6
5
Average
12.2
7.9
12.5
13.0
13.1
13.0
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
6
11
0
9
2
February
4.4
7
5
1
1
0
March
6.9
7
14
4
2
7
April
2.0
0
3
1
3
May
0.9
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.2
1
1
0
0
September
0.3
1
2
0
0
October
0.4
0
0
3
0
November
2.8
3
8
0
2
December
6.3
4
8
15
3
Average
2.9
6.6
3.0
1.9
2.2
1.3
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
4.4
4
6
3
4
4
February
5.2
5
6
4
5
3
March
5.7
6
8
5
5
5
April
6.1
6
7
5
6
May
6.3
6
7
6
6
June
5.8
6
7
6
6
July
4.9
5
5
5
5
August
4.8
5
5
5
4
September
4.6
5
5
5
4
October
4.3
4
4
5
3
November
3.9
4
4
3
4
December
4.0
4
5
5
4
Average
5.0
4.7
5.3
5.0
4.9
4.7
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
133°
139°
244°
174°
283°
February
151°
161°
292°
308°
250°
March
268°
156°
288°
299°
198°
April
303°
301°
297°
300°
May
293°
299°
298°
298°
June
302°
300°
296°
302°
July
288°
296°
283°
291°
August
227°
287°
284°
287°
September
301°
271°
280°
299°
October
283°
276°
268°
282°
November
157°
273°
279°
301°
December
149°
178°
141°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.