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
86.2
71
90
90
94
88
February
86.0
97
89
86
74
82
March
87.5
84
94
87
87
82
April
91.2
89
92
93
88
May
90.8
98
87
94
91
June
93.3
89
95
95
95
July
94.5
94
97
95
93
August
93.6
96
94
95
89
September
92.0
85
94
95
90
October
86.2
94
85
87
80
November
95.3
98
91
99
89
December
83.7
78
77
90
92
Average
89.5
83.7
91.3
89.9
91.9
88.8
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
5.7
5
9
3
5
7
February
7.6
9
10
8
3
9
March
12.0
13
11
13
13
13
April
17.3
20
16
18
14
May
22.1
22
23
22
20
June
26.9
26
27
28
28
July
30.2
30
30
30
32
August
28.8
28
30
29
29
September
24.8
25
24
25
24
October
19.0
20
17
21
18
November
12.5
12
14
11
15
December
7.9
9
7
10
7
Average
16.9
8.8
18.4
17.9
18.0
18.1
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
-1.3
-1
2
-4
-1
0
February
-1.6
0
1
-2
-2
1
March
2.7
4
2
3
3
4
April
7.2
8
6
7
6
May
11.7
10
13
11
11
June
16.7
15
17
17
17
July
20.5
20
21
20
22
August
19.9
19
21
20
20
September
15.9
16
17
16
15
October
10.0
9
8
12
10
November
3.0
2
5
2
5
December
1.1
2
1
3
0
Average
8.1
1.2
8.9
9.1
9.1
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.6
12
11
11
3
5
February
9.9
5
6
10
18
12
March
9.3
11
9
7
10
9
April
7.4
7
9
4
11
May
7.8
4
12
7
7
June
4.6
6
5
6
2
July
3.8
4
5
3
5
August
3.4
2
1
3
8
September
4.4
10
6
4
3
October
8.1
5
10
4
11
November
5.4
5
8
5
7
December
11.4
10
19
3
12
Average
7.2
9.6
6.3
8.0
5.5
7.2
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
2
6
6
6
February
4.8
5
5
6
3
6
March
6.2
7
7
7
4
6
April
6.6
6
7
6
8
May
5.2
5
5
5
6
June
4.6
5
4
4
5
July
3.9
4
4
4
4
August
3.7
5
4
4
3
September
4.4
5
5
5
4
October
4.7
4
5
5
5
November
5.6
5
6
6
6
December
5.3
5
6
5
6
Average
5.1
6.1
4.8
5.4
4.6
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
297°
292°
296°
294°
288°
February
298°
274°
268°
276°
265°
March
302°
296°
270°
284°
282°
April
273°
283°
276°
290°
May
315°
044°
295°
292°
June
320°
272°
242°
286°
July
252°
250°
268°
274°
August
289°
251°
255°
268°
September
007°
292°
278°
357°
October
298°
293°
299°
299°
November
292°
270°
282°
264°
December
289°
299°
267°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.