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
83.3
84
80
91
77
84
February
83.6
95
82
82
74
78
March
88.7
87
88
95
87
89
April
92.2
88
98
97
95
May
92.2
95
91
97
87
June
94.3
94
98
93
94
July
91.9
94
93
88
93
August
90.4
94
89
91
88
September
92.7
95
92
92
88
October
89.8
97
91
86
85
November
90.9
94
84
96
89
December
84.7
85
68
92
89
Average
89.3
88.5
91.0
90.3
89.6
88.5
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
10.6
10
13
10
10
11
February
14.5
16
17
14
12
12
March
18.3
20
18
20
19
19
April
22.1
23
23
23
21
May
25.5
24
27
25
23
June
29.2
28
31
30
28
July
30.8
32
32
31
31
August
29.0
31
30
31
24
September
24.3
28
27
28
10
October
22.7
24
21
24
23
November
16.8
18
18
16
18
December
13.2
14
11
17
12
Average
21.3
15.1
21.9
22.1
22.2
19.4
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
-1.5
-1
2
-2
-1
2
February
2.4
1
4
1
0
3
March
5.0
5
4
5
5
7
April
6.7
7
7
7
6
May
12.7
13
14
11
9
June
16.2
15
17
18
15
July
18.4
18
20
19
18
August
17.2
20
20
19
11
September
13.2
16
14
14
6
October
9.5
9
7
12
10
November
3.0
2
5
1
5
December
1.3
1
2
3
-1
Average
9.0
1.7
8.6
9.4
9.0
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.4
12
13
9
11
16
February
10.3
5
10
9
14
19
March
9.7
12
11
8
9
7
April
9.3
13
6
4
7
May
7.8
6
7
4
13
June
6.5
9
3
7
8
July
4.4
3
6
3
4
August
6.6
5
4
9
8
September
5.7
3
8
7
12
October
5.4
1
3
7
9
November
5.9
5
11
3
5
December
10.2
15
13
4
6
Average
7.8
9.6
7.8
6.8
6.6
9.1
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
2.7
3
2
3
2
3
February
2.9
3
3
3
3
2
March
3.7
3
3
5
3
3
April
3.9
3
4
5
4
May
2.8
3
3
3
3
June
2.2
2
2
2
2
July
1.6
1
2
2
1
August
1.3
1
1
2
1
September
1.5
1
2
2
2
October
1.8
2
2
2
1
November
1.9
2
2
2
2
December
1.8
2
1
2
2
Average
2.5
3.0
2.2
2.5
2.5
2.3
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°
275°
281°
286°
276°
February
265°
253°
260°
289°
269°
March
277°
283°
242°
313°
242°
April
230°
256°
263°
280°
May
308°
219°
256°
300°
June
264°
266°
210°
223°
July
245°
226°
234°
212°
August
266°
211°
118°
208°
September
359°
337°
276°
035°
October
288°
286°
281°
250°
November
286°
289°
290°
287°
December
286°
251°
235°
293°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.