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
83.0
77
69
78
92
93
February
82.9
88
81
78
84
82
March
85.6
65
88
80
90
86
April
84.2
78
91
90
89
May
89.0
92
87
92
94
June
89.8
80
91
95
94
July
90.6
78
100
78
91
August
90.8
82
94
86
96
September
89.8
83
84
95
94
October
85.1
82
79
89
84
November
90.4
91
93
98
90
December
83.6
73
92
81
84
Average
86.6
79.7
81.6
87.5
89.0
90.1
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
3.1
3
6
2
2
5
February
5.2
6
6
5
2
5
March
8.2
10
8
10
11
10
April
14.2
15
15
15
11
May
20.7
22
22
21
20
June
25.5
23
25
28
27
July
28.8
28
31
25
29
August
27.9
25
31
28
28
September
23.6
23
23
24
24
October
17.7
19
17
18
17
November
10.5
9
13
11
13
December
5.5
8
7
7
6
Average
14.6
4.9
16.0
17.0
15.9
16.2
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
-5.5
-4
-1
-8
-4
-3
February
-4.2
-3
-4
-5
-5
-3
March
-1.2
3
0
0
-1
0
April
4.7
6
5
5
3
May
9.9
9
11
10
9
June
15.1
14
14
17
15
July
18.7
19
19
17
20
August
18.3
17
19
19
18
September
14.2
14
13
15
13
October
8.9
9
7
10
7
November
1.7
0
4
2
3
December
-2.1
1
-1
-1
-2
Average
5.6
-3.5
7.0
6.7
7.0
6.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.8
18
25
11
8
4
February
12.7
6
15
18
16
11
March
11.6
24
14
11
5
10
April
14.0
10
9
12
22
May
7.5
8
4
8
3
June
7.6
12
6
5
3
July
7.3
13
3
16
2
August
5.9
13
5
6
4
September
8.2
17
9
8
4
October
10.6
9
9
10
15
November
10.5
10
12
4
8
December
13.6
16
18
10
12
Average
10.3
14.1
13.1
8.6
9.0
7.8
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
7.7
7
6
8
7
8
February
7.6
7
8
8
7
7
March
8.6
7
9
8
8
8
April
8.3
7
9
9
9
May
7.1
7
7
7
9
June
6.2
5
6
7
6
July
5.6
5
7
6
6
August
5.9
6
6
6
6
September
6.0
5
6
6
6
October
6.4
5
6
7
6
November
7.3
7
8
7
7
December
6.9
6
9
6
7
Average
7.0
7.1
6.2
7.1
6.8
7.1
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
299°
301°
292°
302°
268°
February
288°
292°
269°
315°
269°
March
319°
319°
280°
271°
316°
April
008°
292°
305°
307°
May
288°
076°
298°
267°
June
047°
246°
235°
235°
July
215°
239°
344°
215°
August
254°
233°
231°
255°
September
359°
289°
261°
244°
October
277°
318°
345°
281°
November
271°
251°
266°
259°
December
285°
317°
275°
274°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.