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
78.1
75
45
79
90
89
February
80.0
84
83
67
79
82
March
82.2
79
86
67
87
82
April
80.5
72
89
89
83
May
81.3
92
70
86
86
June
80.6
81
85
79
83
July
80.5
72
79
78
82
August
83.8
82
84
82
87
September
81.8
75
85
89
83
October
81.6
84
70
82
79
November
88.6
92
87
99
84
December
80.3
71
80
79
81
Average
81.4
79.2
78.0
78.5
84.3
83.3
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
4.1
3
7
3
3
6
February
5.4
5
6
6
3
6
March
7.8
9
8
9
9
10
April
12.5
14
13
13
11
May
17.7
18
18
18
18
June
22.7
21
23
24
24
July
26.5
26
27
25
28
August
26.1
24
27
26
27
September
22.4
22
22
23
23
October
17.4
18
17
18
17
November
11.2
10
13
11
14
December
6.5
8
7
8
7
Average
14.0
5.7
15.1
15.5
15.0
15.9
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
-3.4
-2
1
-6
-3
0
February
-2.2
-2
-2
-3
-3
0
March
0.4
2
1
1
0
3
April
5.1
6
5
5
4
May
9.6
9
11
9
9
June
14.8
14
15
15
16
July
19.0
20
19
18
21
August
18.9
18
19
19
20
September
15.3
15
14
16
15
October
9.9
10
9
11
7
November
3.3
2
5
3
5
December
-1.9
2
1
1
0
Average
6.7
-1.4
7.8
7.7
7.7
8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.6
20
21
14
4
3
February
13.0
10
11
20
18
11
March
12.2
19
18
13
4
8
April
11.2
9
5
8
17
May
8.1
5
6
6
4
June
5.6
7
5
4
4
July
4.0
5
2
7
2
August
5.4
6
5
8
5
September
10.0
21
12
9
4
October
11.7
12
14
9
16
November
9.6
7
12
6
11
December
14.8
18
22
10
14
Average
10.0
16.5
10.9
9.6
7.5
7.9
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
8.6
8
8
10
9
8
February
8.3
9
9
8
9
7
March
9.6
10
9
9
9
9
April
9.0
8
9
9
11
May
7.8
8
8
8
8
June
6.7
7
7
6
6
July
6.3
6
7
6
6
August
6.4
7
7
6
7
September
7.3
7
7
7
7
October
7.4
6
7
6
7
November
7.9
7
8
7
8
December
8.3
8
11
7
8
Average
7.8
8.7
7.3
7.9
7.4
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
339°
323°
315°
325°
302°
February
307°
310°
264°
341°
277°
March
336°
326°
257°
269°
044°
April
167°
265°
309°
335°
May
185°
106°
296°
253°
June
158°
200°
195°
180°
July
184°
202°
192°
182°
August
173°
190°
180°
185°
September
053°
341°
273°
097°
October
334°
039°
023°
017°
November
310°
260°
305°
254°
December
345°
336°
297°
311°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.