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
91.1
91
95
96
93
85
February
96.9
99
98
100
93
98
March
97.7
100
97
97
100
100
April
93.6
99
100
98
99
76
May
97.2
98
99
100
99
June
98.3
100
100
100
99
July
99.7
100
100
99
100
August
99.2
100
100
98
97
September
98.2
100
99
100
89
October
98.7
97
100
97
97
November
91.1
98
98
81
95
December
87.0
94
90
71
86
Average
96.1
97.2
98.2
98.3
94.7
93.5
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
12.8
14
14
15
14
13
February
15.1
16
14
18
17
19
March
18.0
18
15
21
19
18
April
22.1
22
23
23
25
20
May
27.0
26
29
30
28
June
33.0
30
34
34
33
July
36.1
36
36
37
35
August
35.2
35
36
35
36
September
31.6
29
33
33
33
October
26.2
26
27
23
29
November
17.9
19
16
17
18
December
13.1
15
11
10
14
Average
23.2
17.3
23.5
25.2
24.4
24.6
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
3.3
5
5
2
3
4
February
2.9
5
2
1
3
2
March
5.4
7
5
5
4
5
April
6.8
7
7
6
7
5
May
10.0
10
9
11
11
June
14.1
13
15
16
13
July
16.3
17
17
17
14
August
16.1
16
16
16
17
September
13.4
14
16
13
14
October
8.0
10
9
10
8
November
4.1
4
2
7
3
December
2.8
4
2
4
1
Average
8.3
6.1
8.8
8.4
9.1
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
5.8
6
8
4
6
4
February
6.5
7
7
5
6
5
March
6.6
7
9
6
7
6
April
5.6
5
6
7
5
5
May
5.4
6
3
7
5
June
5.8
6
7
7
5
July
5.0
6
6
6
3
August
4.9
5
5
5
4
September
4.8
5
5
5
2
October
4.7
5
4
6
3
November
4.0
4
5
3
4
December
4.8
4
6
6
5
Average
5.4
6.2
5.9
5.1
5.7
4.4
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
168°
175°
314°
172°
174°
February
173°
182°
312°
295°
321°
March
182°
181°
226°
258°
192°
April
190°
208°
192°
172°
178°
May
173°
227°
247°
199°
June
189°
208°
190°
215°
July
203°
192°
197°
210°
August
229°
209°
203°
217°
September
191°
220°
225°
309°
October
257°
279°
190°
309°
November
272°
196°
289°
271°
December
175°
180°
169°
286°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.