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
85.4
86
90
91
87
93
February
85.3
93
91
94
62
87
March
89.2
81
90
91
89
89
April
94.2
94
99
96
95
97
May
83.8
87
71
92
88
June
92.0
87
98
85
97
July
95.9
97
96
98
100
August
94.8
92
97
92
97
September
89.2
85
92
95
95
October
88.6
97
82
94
78
November
91.2
92
93
100
86
December
89.2
78
88
91
90
Average
89.8
87.0
91.0
89.8
89.7
91.2
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
7.9
8
10
5
7
9
February
10.9
9
11
9
7
12
March
12.6
12
12
12
15
16
April
16.2
1
19
17
18
18
May
22.5
20
21
21
21
June
26.2
24
26
24
26
July
29.4
29
27
29
30
August
28.5
28
27
29
29
September
25.5
25
24
24
25
October
20.1
21
16
21
17
November
13.9
14
14
14
16
December
10.0
10
9
13
10
Average
17.5
7.5
18.5
17.4
18.5
18.9
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
0.6
3
2
-4
0
4
February
1.8
0
2
-1
0
4
March
3.3
0
3
1
5
8
April
7.8
0
9
7
7
9
May
12.6
11
12
5
13
June
16.3
14
17
15
10
July
20.1
21
22
20
15
August
20.5
20
19
22
23
September
16.4
17
16
9
17
October
9.7
10
9
6
5
November
4.4
3
6
1
4
December
2.1
6
1
0
2
Average
8.7
0.8
9.8
9.0
7.6
9.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.7
7
7
9
6
13
February
11.2
11
10
8
19
16
March
8.2
14
7
7
5
10
April
4.5
4
7
2
4
8
May
5.7
7
7
3
3
June
3.9
8
0
10
1
July
3.7
3
4
4
1
August
4.3
6
0
8
5
September
4.4
3
6
1
8
October
7.0
6
7
5
9
November
6.5
6
6
5
4
December
7.1
4
12
4
14
Average
6.6
10.2
6.0
5.4
5.8
7.0
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
8.3
8
8
8
9
0
February
7.8
7
9
8
9
7
March
9.4
9
9
9
9
9
April
8.8
9
7
9
8
10
May
7.4
6
8
7
10
June
6.5
5
6
7
8
July
5.5
4
7
6
6
August
5.5
6
6
5
6
September
6.4
6
7
7
7
October
6.7
6
6
8
6
November
7.2
6
8
8
8
December
7.1
6
8
6
10
Average
7.4
8.1
6.0
7.7
7.7
7.8
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
285°
288°
316°
309°
360°
February
275°
296°
249°
311°
238°
March
297°
308°
252°
308°
244°
April
235°
172°
292°
293°
272°
May
062°
079°
282°
333°
June
116°
223°
198°
206°
July
180°
200°
233°
245°
August
187°
200°
230°
200°
September
352°
313°
273°
056°
October
282°
319°
312°
296°
November
344°
331°
310°
239°
December
295°
324°
282°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.