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
86.9
84
92
69
91
88
February
86.3
81
89
83
91
86
March
96.0
96
97
91
97
96
April
96.8
96
98
96
95
May
96.0
98
95
97
94
June
95.1
92
91
99
96
July
97.0
98
97
97
95
August
93.8
97
98
96
98
September
91.2
95
95
95
67
October
85.0
90
75
91
84
November
84.9
79
83
83
90
December
84.3
77
81
87
89
Average
91.2
87.4
92.1
88.7
93.8
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
9.1
8
10
9
9
9
February
8.8
11
9
9
8
10
March
12.5
13
12
13
12
11
April
15.5
14
14
18
16
May
20.6
23
17
19
21
June
23.3
24
22
27
21
July
27.0
28
27
27
25
August
27.3
28
29
27
26
September
23.1
23
25
23
24
October
16.6
17
20
16
16
November
11.3
11
10
12
11
December
8.5
11
6
6
10
Average
16.2
10.7
17.5
17.0
17.0
16.8
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
3.7
4
4
3
5
5
February
2.9
5
3
3
3
3
March
4.1
5
4
5
3
3
April
6.6
7
5
6
6
May
10.4
12
8
10
10
June
12.9
12
12
15
12
July
15.2
15
16
16
15
August
15.6
17
16
15
14
September
13.2
13
13
13
14
October
8.4
9
10
8
10
November
5.0
4
2
7
5
December
3.4
5
2
2
4
Average
8.0
4.5
8.7
8.2
8.5
8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.3
21
15
12
21
30
February
17.7
21
12
13
21
11
March
12.6
11
11
13
11
9
April
12.9
19
10
5
5
May
7.6
6
18
5
10
June
6.8
8
10
10
10
July
1.0
1
2
0
1
August
0.9
2
0
1
1
September
5.1
6
3
5
6
October
8.9
9
7
11
4
November
18.3
9
25
25
21
December
18.0
27
11
20
14
Average
10.9
17.3
9.8
10.1
10.1
9.4
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
4.3
4
4
4
4
5
February
5.3
5
6
5
6
5
March
5.6
6
6
5
5
6
April
6.0
6
6
6
6
May
5.2
5
5
6
5
June
5.2
5
5
6
5
July
5.1
5
5
5
6
August
5.3
5
5
6
5
September
5.1
5
5
5
5
October
4.7
4
5
5
5
November
4.6
4
4
5
5
December
4.2
4
3
5
5
Average
5.0
4.7
4.9
4.8
5.2
5.3
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°
147°
180°
174°
174°
February
172°
185°
219°
186°
189°
March
238°
209°
213°
211°
213°
April
196°
201°
298°
272°
May
303°
208°
282°
290°
June
292°
286°
290°
232°
July
307°
326°
314°
275°
August
321°
296°
277°
306°
September
294°
326°
266°
318°
October
310°
261°
175°
218°
November
189°
304°
182°
183°
December
178°
058°
168°
177°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.