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
88.5
93
83
94
87
93
February
87.6
99
85
91
76
86
March
90.3
88
90
84
92
86
April
92.8
88
92
99
97
May
93.1
90
93
98
92
June
92.7
88
92
92
95
July
93.2
89
93
93
95
August
90.8
90
86
90
90
September
93.3
95
92
94
92
October
91.4
93
89
92
92
November
88.3
88
89
99
91
December
78.7
89
85
81
86
Average
90.6
92.5
89.1
90.0
91.4
91.5
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
15.2
17
17
14
14
16
February
18.9
19
21
19
15
17
March
21.1
23
21
22
21
22
April
24.6
25
24
25
24
May
28.4
26
29
28
27
June
30.8
30
32
30
30
July
32.4
33
32
31
33
August
31.8
33
31
32
32
September
29.8
29
29
29
28
October
25.5
26
23
25
26
November
19.2
20
20
19
22
December
16.3
18
16
20
14
Average
23.9
19.4
24.8
24.6
24.2
24.2
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
4.6
5
6
2
5
7
February
7.5
6
9
7
5
7
March
8.9
11
10
9
9
12
April
11.9
13
12
11
12
May
16.6
15
18
15
16
June
20.1
19
21
21
19
July
22.3
23
23
22
22
August
22.3
23
22
23
23
September
19.1
18
19
19
19
October
14.3
13
11
15
16
November
7.8
8
10
6
11
December
5.9
7
7
8
3
Average
12.7
7.5
13.7
13.6
13.1
13.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.8
9
11
7
12
7
February
7.6
6
10
4
15
14
March
7.0
8
9
9
5
9
April
4.7
7
4
1
4
May
4.8
9
3
3
5
June
5.4
11
5
7
3
July
3.4
5
5
3
2
August
4.4
7
5
4
5
September
4.8
3
5
6
6
October
4.0
4
5
5
2
November
4.9
2
8
2
7
December
10.5
15
11
6
5
Average
5.9
7.7
7.6
5.5
5.4
5.5
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
7.0
8
6
7
7
8
February
7.1
7
7
7
7
8
March
7.4
7
7
8
7
7
April
7.2
7
7
7
8
May
6.4
7
7
7
6
June
5.8
6
5
6
6
July
5.2
5
6
5
5
August
5.1
6
5
5
4
September
5.6
5
6
4
6
October
5.6
6
5
5
6
November
5.9
6
7
6
6
December
6.2
7
5
6
6
Average
6.3
7.2
6.1
6.2
6.0
6.2
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
253°
242°
297°
268°
280°
February
250°
246°
215°
305°
253°
March
255°
252°
229°
035°
233°
April
242°
220°
249°
243°
May
347°
235°
237°
267°
June
246°
109°
193°
247°
July
232°
219°
213°
202°
August
227°
198°
156°
197°
September
032°
028°
037°
033°
October
344°
019°
299°
051°
November
010°
021°
351°
025°
December
293°
354°
251°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.