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
77.1
69
73
66
87
87
February
77.5
77
80
78
57
74
March
84.5
82
84
78
94
82
April
91.4
93
91
95
87
May
86.0
82
80
92
89
June
89.5
86
97
93
88
July
86.0
81
71
95
89
August
85.8
76
85
86
88
September
88.1
84
90
90
90
October
86.4
87
93
86
80
November
86.6
88
76
97
92
December
79.8
76
57
91
82
Average
84.4
76.3
82.3
80.8
88.9
85.8
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
7.5
6
11
5
6
10
February
11.9
14
14
11
5
11
March
15.3
17
15
17
17
17
April
20.2
21
20
20
18
May
24.2
23
25
23
22
June
27.3
26
29
28
27
July
29.3
29
29
29
31
August
28.2
28
28
29
28
September
26.2
26
25
26
25
October
20.7
21
19
22
20
November
13.9
15
15
13
17
December
10.2
12
10
15
8
Average
18.7
12.1
20.0
19.8
19.5
19.6
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
-1.4
-1
3
-4
-1
2
February
2.3
3
5
0
-2
2
March
4.7
7
4
5
6
8
April
8.9
10
9
9
7
May
14.2
13
15
13
12
June
17.7
16
18
19
18
July
20.0
20
20
20
21
August
19.4
19
20
21
20
September
16.5
16
16
16
16
October
10.7
11
9
13
11
November
4.1
5
5
3
7
December
2.2
4
3
6
0
Average
9.1
2.6
10.4
9.9
10.2
10.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
19.8
32
25
26
11
12
February
15.3
10
12
16
17
25
March
11.3
16
11
6
7
17
April
9.4
6
10
8
12
May
9.3
8
12
6
11
June
7.3
11
3
6
7
July
5.5
3
13
4
4
August
6.8
10
7
10
6
September
6.3
4
6
8
5
October
9.8
12
6
11
9
November
10.2
9
15
5
9
December
16.0
19
28
7
16
Average
11.1
19.4
10.5
11.5
8.0
10.7
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
4.0
4
4
4
3
4
February
4.1
4
5
5
3
4
March
4.4
4
5
5
4
4
April
3.8
4
5
4
4
May
2.0
2
2
2
3
June
1.5
2
1
2
2
July
1.3
2
1
2
1
August
1.2
1
1
1
1
September
1.3
1
2
2
1
October
2.0
3
2
2
2
November
3.1
3
4
3
4
December
3.5
3
3
4
4
Average
2.8
4.0
2.7
2.8
2.6
2.6
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
241°
230°
255°
246°
240°
February
231°
218°
227°
268°
249°
March
255°
242°
236°
224°
238°
April
247°
247°
262°
271°
May
280°
233°
266°
269°
June
275°
281°
227°
260°
July
254°
270°
262°
277°
August
251°
247°
219°
297°
September
277°
282°
246°
192°
October
267°
221°
254°
266°
November
230°
239°
225°
245°
December
224°
242°
215°
230°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.