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
89.4
91
90
87
89
91
February
87.0
95
85
92
73
83
March
91.5
89
94
85
93
90
April
94.7
94
98
98
95
May
95.3
90
97
98
95
June
94.2
96
98
93
93
July
94.2
93
91
96
96
August
92.1
93
89
89
92
September
93.1
94
93
95
92
October
94.2
91
93
95
92
November
88.7
92
89
95
95
December
85.3
91
91
87
86
Average
91.9
91.3
92.0
92.0
92.2
91.8
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
15.9
16
18
14
15
18
February
18.8
17
21
18
15
17
March
20.6
22
21
22
21
22
April
24.0
24
24
24
24
May
27.3
25
28
27
27
June
29.9
29
31
29
29
July
31.5
32
31
31
32
August
31.0
32
31
31
31
September
29.1
29
28
29
28
October
25.3
25
23
26
26
November
19.4
20
21
18
21
December
17.3
17
17
21
16
Average
23.5
18.2
24.3
24.2
23.8
24.4
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
6.2
6
8
4
7
8
February
8.9
7
11
9
7
9
March
10.6
13
12
11
11
13
April
13.8
15
13
13
14
May
18.2
17
20
17
18
June
21.6
21
22
22
21
July
23.7
24
24
23
24
August
23.6
24
23
24
24
September
21.1
20
21
20
21
October
16.1
15
14
16
18
November
9.4
10
13
7
12
December
7.8
8
9
10
6
Average
14.4
8.7
15.4
15.2
14.7
15.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.8
2
4
4
6
4
February
8.1
5
9
2
11
9
March
7.6
4
5
6
5
5
April
2.4
1
1
1
5
May
2.4
5
2
1
2
June
4.0
2
2
5
3
July
3.7
2
7
3
4
August
4.5
5
6
4
5
September
4.1
3
5
5
5
October
1.8
2
1
2
3
November
5.3
7
5
5
5
December
5.0
3
2
5
2
Average
4.5
3.6
3.6
3.5
4.0
4.1
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
5.2
6
5
5
5
6
February
5.2
6
5
4
5
6
March
5.9
6
6
7
4
4
April
6.1
5
6
5
6
May
5.7
5
6
5
6
June
4.8
5
5
5
5
July
4.4
4
6
4
4
August
3.7
3
3
3
3
September
3.7
3
4
2
3
October
3.8
3
3
3
4
November
3.8
3
4
3
5
December
4.1
3
2
3
5
Average
4.8
5.8
4.1
4.7
3.9
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
247°
236°
283°
245°
255°
February
211°
225°
202°
262°
242°
March
219°
214°
205°
202°
229°
April
177°
190°
228°
203°
May
235°
181°
190°
201°
June
202°
173°
174°
210°
July
189°
187°
178°
172°
August
191°
184°
161°
180°
September
270°
313°
171°
085°
October
293°
272°
261°
100°
November
319°
264°
331°
286°
December
275°
223°
220°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.