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
79.6
73
80
62
85
83
February
86.3
79
92
91
88
85
March
93.3
95
99
82
97
98
April
93.3
96
94
96
94
May
90.8
89
93
92
94
June
92.1
89
87
94
96
July
93.0
94
93
84
94
August
88.8
95
87
88
96
September
90.3
90
95
95
71
October
89.5
84
90
94
87
November
85.6
94
83
80
85
December
82.5
70
84
92
78
Average
88.6
82.8
89.3
87.1
90.6
89.1
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
7.7
8
9
7
8
8
February
7.2
10
8
9
7
8
March
9.8
11
10
11
10
9
April
12.3
12
11
14
13
May
16.1
19
14
15
16
June
18.5
19
18
22
17
July
20.6
22
21
20
20
August
22.2
24
24
22
21
September
19.5
20
22
19
21
October
14.3
15
18
13
14
November
9.5
10
8
10
10
December
7.2
10
6
5
8
Average
13.2
9.6
14.7
14.3
13.6
13.5
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
1.8
3
3
2
2
2
February
1.3
4
2
2
2
2
March
2.4
4
2
4
2
1
April
4.5
4
4
5
4
May
7.8
10
7
7
8
June
9.8
9
10
11
10
July
11.4
12
12
12
11
August
12.1
13
13
12
11
September
10.2
10
11
10
11
October
6.2
7
8
6
8
November
3.3
4
2
4
3
December
2.0
5
0
1
3
Average
5.7
3.6
6.7
6.4
6.1
6.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.9
18
9
13
15
27
February
15.0
21
10
8
15
12
March
9.6
9
6
14
12
7
April
10.6
10
19
6
5
May
6.8
5
13
5
9
June
4.3
2
7
3
8
July
1.4
3
2
0
2
August
1.3
2
0
0
2
September
5.6
4
0
10
6
October
10.4
10
9
17
7
November
15.8
7
16
31
20
December
14.3
14
5
16
16
Average
9.4
15.6
6.5
8.8
9.7
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
4.1
4
4
4
4
5
February
5.0
4
5
5
7
5
March
4.6
4
5
4
5
5
April
5.2
5
6
5
5
May
5.7
6
6
6
6
June
5.9
6
5
6
6
July
6.1
6
6
7
6
August
5.4
6
5
6
6
September
4.3
4
5
4
4
October
4.3
4
5
4
5
November
4.4
4
5
5
5
December
3.8
4
4
5
3
Average
4.9
4.2
5.0
4.9
5.3
5.1
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
223°
141°
250°
235°
253°
February
175°
265°
086°
266°
275°
March
306°
301°
320°
289°
332°
April
300°
288°
326°
302°
May
302°
305°
310°
298°
June
300°
312°
314°
299°
July
296°
309°
304°
302°
August
317°
326°
310°
307°
September
304°
330°
326°
045°
October
040°
299°
286°
282°
November
244°
190°
255°
236°
December
249°
136°
230°
194°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.