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
86.8
79
86
88
88
91
February
86.8
96
92
92
80
87
March
88.1
86
92
87
89
90
April
93.6
88
92
93
96
95
May
92.1
98
86
97
95
June
93.4
83
93
96
97
July
96.1
95
96
98
97
August
94.9
96
96
95
97
September
92.2
87
92
95
94
October
90.8
91
91
90
89
November
92.5
95
89
100
95
December
83.5
74
77
94
90
Average
90.9
86.7
90.3
90.7
93.4
93.2
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
5.4
5
8
3
5
7
February
9.1
10
12
9
4
9
March
12.3
14
12
14
14
15
April
18.6
19
21
17
19
16
May
23.4
23
24
23
21
June
27.9
27
28
29
29
July
30.7
31
30
31
33
August
29.4
29
30
31
29
September
25.7
26
25
26
25
October
19.9
20
17
21
20
November
12.1
13
14
12
16
December
7.6
9
6
11
7
Average
17.7
11.9
19.2
18.4
18.7
18.7
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
-2.3
-1
2
-5
-2
0
February
0.0
1
1
-2
-2
1
March
2.5
5
2
3
4
5
April
8.0
10
9
6
8
6
May
13.1
11
14
12
12
June
17.8
15
18
19
18
July
20.7
21
21
20
22
August
19.8
20
20
21
22
September
16.2
16
16
17
15
October
10.7
10
8
13
10
November
3.3
3
5
2
6
December
0.3
2
0
2
-1
Average
8.5
3.3
9.2
8.8
9.4
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.0
19
11
10
6
6
February
9.7
5
4
11
13
7
March
10.3
13
10
13
5
8
April
8.5
10
10
10
4
9
May
7.9
6
9
9
6
June
4.8
8
5
6
2
July
3.7
1
5
3
2
August
3.3
2
3
3
4
September
6.9
10
5
7
3
October
6.8
6
9
5
7
November
6.3
4
8
2
5
December
9.2
10
13
3
9
Average
7.5
11.9
6.7
7.9
5.4
5.2
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
8.3
8
8
8
8
9
February
8.0
7
9
10
8
8
March
9.0
9
9
10
9
7
April
8.4
8
7
8
8
10
May
6.7
6
7
6
8
June
6.8
7
7
6
7
July
5.6
6
5
6
6
August
5.6
6
6
5
6
September
6.0
6
7
7
6
October
6.9
6
7
7
7
November
7.5
7
8
7
8
December
6.5
6
6
6
8
Average
7.2
8.0
6.7
7.1
6.8
7.3
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
290°
278°
300°
300°
284°
February
283°
265°
257°
300°
264°
March
295°
291°
265°
286°
265°
April
251°
253°
287°
283°
292°
May
298°
136°
294°
277°
June
297°
263°
226°
261°
July
255°
227°
255°
253°
August
269°
225°
203°
253°
September
352°
289°
254°
254°
October
290°
282°
268°
279°
November
265°
252°
280°
251°
December
284°
301°
236°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.