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
99.1
99
99
100
100
100
February
99.0
99
99
99
100
99
March
99.7
100
100
100
100
99
April
99.9
100
100
100
100
May
99.9
100
100
100
100
June
99.9
100
100
100
100
July
99.8
100
100
100
100
August
99.5
99
100
100
98
September
99.4
100
100
99
98
October
99.6
100
100
99
100
November
99.3
99
100
99
100
December
98.5
98
99
100
98
Average
99.4
99.1
99.4
99.7
99.6
99.2
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
14.9
16
13
16
15
15
February
16.5
16
15
18
18
20
March
18.9
19
15
22
20
17
April
25.0
25
25
27
23
May
28.4
28
29
30
30
June
34.7
31
35
38
34
July
38.5
39
38
40
38
August
37.8
36
39
38
39
September
33.6
31
35
35
35
October
27.0
27
29
25
29
November
20.4
19
17
23
21
December
14.4
16
12
14
15
Average
24.8
16.6
24.5
26.6
26.7
26.3
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
3
1
-1
2
1
February
1.7
4
-1
-2
2
1
March
4.7
5
4
4
3
5
April
8.8
7
9
9
9
May
11.9
12
12
14
12
June
17.0
14
17
22
16
July
21.1
21
22
24
19
August
20.2
18
22
20
20
September
15.9
15
18
16
15
October
8.5
8
11
9
9
November
2.5
1
0
4
2
December
0.5
1
0
2
0
Average
8.9
4.1
8.4
9.5
10.4
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.4
2
12
1
0
0
February
4.4
11
6
3
0
0
March
3.1
4
7
1
1
3
April
1.5
0
0
0
10
May
0.9
1
0
0
0
June
0.0
0
1
0
0
July
0.0
0
0
0
0
August
0.9
6
0
0
0
September
0.1
0
1
0
0
October
0.2
0
0
2
0
November
1.3
0
2
0
0
December
4.6
6
4
7
2
Average
2.2
5.7
3.1
0.8
0.8
1.2
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
6.5
7
9
5
5
7
February
8.3
8
9
7
8
7
March
10.1
12
12
9
10
10
April
11.3
9
12
11
11
May
10.6
11
12
10
10
June
9.6
10
10
9
9
July
8.7
10
9
8
9
August
8.0
8
6
9
8
September
7.1
8
7
7
4
October
6.3
7
5
8
6
November
6.1
6
8
5
6
December
5.5
4
7
7
7
Average
8.4
9.2
8.7
8.1
8.2
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
272°
259°
032°
335°
269°
February
242°
252°
279°
281°
328°
March
247°
252°
272°
262°
243°
April
263°
261°
249°
250°
May
240°
264°
251°
249°
June
236°
249°
232°
238°
July
238°
238°
232°
230°
August
247°
226°
234°
235°
September
240°
229°
243°
252°
October
267°
288°
257°
246°
November
300°
276°
271°
261°
December
310°
248°
244°
289°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.