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
98.4
97
99
99
100
100
February
97.9
95
98
100
99
98
March
99.0
98
100
99
99
98
April
99.5
100
100
100
97
May
99.5
100
100
98
100
June
99.5
100
98
100
100
July
99.9
100
100
100
100
August
98.8
95
100
100
97
September
98.9
99
100
99
96
October
98.7
100
100
99
100
November
98.5
99
97
100
100
December
96.7
96
100
97
98
Average
98.6
96.6
98.8
99.2
99.1
98.5
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
15.1
16
13
16
16
16
February
16.1
15
13
18
18
19
March
18.2
18
14
22
19
16
April
24.3
24
25
26
22
May
27.5
26
29
29
30
June
33.5
29
35
36
33
July
37.3
38
37
38
36
August
36.7
35
38
37
38
September
32.8
30
34
34
36
October
26.5
27
28
24
28
November
20.6
20
17
23
21
December
14.8
17
12
14
16
Average
24.2
16.1
23.8
26.1
26.0
25.8
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
2.2
3
2
1
1
1
February
2.6
5
1
0
3
2
March
5.1
5
4
5
3
5
April
9.2
7
9
9
9
May
12.3
12
13
13
13
June
16.9
14
17
19
16
July
21.8
22
22
24
19
August
20.8
19
23
21
21
September
16.1
15
19
17
16
October
9.8
9
12
9
12
November
4.3
4
2
5
4
December
1.5
3
1
2
0
Average
9.5
4.2
9.3
10.6
10.5
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.1
1
9
1
0
0
February
5.0
14
8
1
0
0
March
4.7
7
8
2
2
6
April
1.4
0
0
0
9
May
0.6
1
0
0
0
June
0.2
0
1
0
0
July
1.0
6
0
1
0
August
1.0
6
0
0
1
September
0.2
0
1
0
0
October
0.1
0
1
0
0
November
1.9
1
1
0
2
December
4.4
2
3
11
2
Average
2.5
7.5
3.3
0.8
1.1
1.7
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
7.9
8
10
7
8
8
February
9.1
8
10
9
10
7
March
10.5
12
12
10
11
10
April
11.1
8
12
11
10
May
11.0
11
12
10
10
June
9.8
11
9
9
10
July
9.4
10
9
9
9
August
8.7
8
8
10
8
September
7.5
7
7
8
5
October
7.5
8
6
9
6
November
7.3
7
10
6
6
December
6.6
5
8
8
7
Average
9.0
9.4
8.9
8.9
9.3
8.4
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
282°
236°
032°
293°
284°
February
236°
248°
015°
287°
337°
March
262°
245°
271°
257°
235°
April
269°
258°
242°
251°
May
228°
270°
252°
247°
June
224°
250°
227°
229°
July
231°
235°
228°
226°
August
242°
231°
223°
235°
September
226°
230°
238°
270°
October
278°
274°
260°
256°
November
302°
271°
312°
262°
December
313°
240°
243°
302°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.