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
83.1
76
77
82
93
86
February
81.3
86
86
78
73
81
March
83.8
84
85
78
85
83
April
82.5
75
90
89
84
May
83.8
96
81
90
86
June
87.2
77
88
92
94
July
89.3
85
96
83
91
August
90.6
83
94
92
93
September
87.3
76
90
91
89
October
81.9
83
80
87
76
November
91.3
97
88
96
88
December
81.1
70
81
81
87
Average
85.1
82.0
82.5
86.1
87.9
86.9
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
4.0
4
8
2
3
6
February
6.1
6
8
6
3
6
March
9.2
11
10
11
11
11
April
14.9
18
14
16
12
May
20.5
21
22
20
19
June
25.4
24
25
27
26
July
28.7
29
30
27
30
August
27.3
26
30
27
28
September
23.6
24
24
24
23
October
18.2
19
17
19
17
November
11.2
11
13
11
14
December
6.5
9
6
8
6
Average
15.2
7.1
17.1
16.9
16.3
16.4
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
-3.1
-1
1
-7
-3
-1
February
-3.9
-2
-2
-4
-4
-1
March
0.7
3
1
1
1
3
April
5.6
7
6
5
4
May
10.7
9
13
10
9
June
15.8
15
16
17
16
July
19.8
20
20
19
21
August
19.0
18
20
20
19
September
15.2
16
14
16
14
October
9.6
10
7
10
9
November
2.6
2
5
2
4
December
-1.6
2
0
1
-1
Average
6.8
0.0
8.4
7.8
7.8
7.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.8
19
19
15
3
9
February
14.9
11
9
15
27
15
March
13.4
16
15
14
7
12
April
13.2
13
9
10
16
May
12.0
7
14
11
6
June
6.9
6
7
7
5
July
5.8
5
4
8
4
August
6.2
8
3
8
7
September
10.0
22
7
10
5
October
13.1
13
13
7
20
November
8.1
2
10
5
14
December
14.2
14
16
5
13
Average
11.1
15.1
10.5
9.8
8.9
9.7
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
8.9
8
8
9
10
9
February
8.3
9
8
8
8
8
March
9.9
10
10
9
10
9
April
9.1
8
10
9
10
May
7.3
7
7
7
8
June
6.6
7
7
6
6
July
5.8
6
6
6
6
August
5.9
6
6
6
6
September
6.6
7
6
7
7
October
7.0
7
7
7
7
November
8.4
7
8
8
8
December
7.9
7
10
7
9
Average
7.7
8.9
7.2
7.5
7.4
7.6
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
309°
307°
313°
314°
301°
February
307°
300°
288°
323°
289°
March
310°
314°
289°
297°
352°
April
042°
299°
298°
317°
May
312°
076°
309°
283°
June
349°
269°
226°
283°
July
216°
227°
297°
228°
August
306°
219°
263°
233°
September
355°
312°
297°
353°
October
312°
357°
337°
329°
November
303°
284°
300°
284°
December
307°
327°
295°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.