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
83.7
79
81
88
91
78
February
84.0
91
84
86
74
81
March
94.8
95
97
96
96
88
April
94.8
96
94
96
97
93
May
96.8
97
97
98
98
June
96.9
98
100
96
97
July
97.2
96
97
94
100
August
97.0
98
96
99
95
September
95.7
100
97
93
96
October
93.4
96
97
97
85
November
92.5
95
91
96
98
December
83.1
94
57
86
89
Average
92.8
90.9
94.2
93.1
93.5
91.9
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
11.0
8
14
11
11
13
February
14.1
17
16
13
7
13
March
18.5
19
17
19
21
19
April
22.1
23
22
23
22
21
May
27.5
28
29
26
26
June
31.3
31
34
30
31
July
32.9
32
36
32
33
August
32.0
33
33
33
32
September
30.2
31
31
29
28
October
23.7
25
23
25
22
November
16.7
18
17
17
19
December
13.7
15
12
19
13
Average
22.1
16.7
23.4
23.7
22.6
22.4
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
2.2
-1
5
-1
3
5
February
4.5
6
6
2
-1
4
March
8.7
10
8
8
10
11
April
12.0
14
12
12
11
11
May
17.8
18
19
17
16
June
21.8
22
23
22
21
July
23.9
24
25
23
25
August
23.1
24
24
24
23
September
20.4
20
20
20
20
October
13.6
15
12
16
13
November
6.4
8
7
6
9
December
4.8
5
6
10
3
Average
12.6
7.3
13.8
13.2
13.3
13.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.7
20
9
14
9
13
February
13.3
10
13
15
19
15
March
7.7
5
10
9
7
11
April
7.7
8
7
7
4
8
May
4.1
3
4
6
4
June
4.3
5
3
7
4
July
3.6
3
5
5
3
August
3.9
4
6
4
6
September
4.0
1
2
6
7
October
7.2
6
5
5
10
November
7.2
6
7
5
5
December
10.7
6
26
6
12
Average
7.2
10.2
5.8
7.4
6.6
7.8
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
8.2
8
8
9
8
8
February
8.9
9
9
9
8
9
March
9.0
8
9
9
9
9
April
9.0
10
9
10
8
8
May
7.9
7
9
8
8
June
7.0
6
7
7
7
July
6.3
6
7
6
6
August
6.2
7
6
7
6
September
6.2
6
6
6
7
October
7.3
8
8
7
7
November
7.1
7
7
7
7
December
7.8
8
7
9
8
Average
7.7
8.9
7.4
7.7
7.5
7.6
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
310°
240°
335°
272°
205°
February
215°
219°
216°
360°
276°
March
198°
226°
224°
165°
202°
April
205°
174°
194°
229°
271°
May
122°
184°
153°
186°
June
276°
162°
181°
180°
July
229°
214°
218°
217°
August
014°
180°
133°
007°
September
085°
023°
114°
067°
October
227°
196°
213°
066°
November
314°
121°
205°
189°
December
226°
153°
205°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.