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
99.3
97
100
100
99
100
February
99.0
99
99
99
98
100
March
98.7
98
99
98
99
99
April
99.8
100
100
100
100
May
99.7
100
100
100
100
June
99.6
100
100
99
100
July
99.9
100
100
100
100
August
99.7
100
99
100
100
September
99.9
100
100
100
100
October
99.7
99
100
100
100
November
99.6
100
100
100
100
December
98.8
97
100
99
100
Average
99.3
97.8
99.5
99.6
99.5
99.9
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
15.6
16
16
15
15
16
February
18.6
19
17
17
19
17
March
23.0
22
23
23
23
22
April
28.1
28
29
27
28
May
32.5
32
34
32
34
June
36.6
37
36
36
37
July
36.6
40
37
34
38
August
35.3
37
33
33
38
September
32.7
36
32
32
32
October
26.9
28
25
28
29
November
20.9
21
19
22
23
December
16.0
17
17
19
15
Average
26.0
19.3
27.8
26.6
26.6
27.4
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
2.4
4
3
1
1
3
February
4.6
6
3
1
4
5
March
9.1
10
9
6
8
10
April
13.5
13
13
13
15
May
18.2
19
19
18
20
June
22.8
23
23
23
22
July
24.2
26
24
22
25
August
23.3
24
22
22
25
September
19.9
22
20
19
18
October
13.7
15
13
14
13
November
7.3
9
6
7
9
December
3.2
3
5
5
0
Average
12.7
6.8
14.0
13.0
12.9
13.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.4
3
5
1
2
3
February
2.7
2
5
1
4
4
March
2.4
1
2
4
0
7
April
0.5
0
0
2
0
May
0.1
0
0
0
0
June
1.1
0
0
5
0
July
0.8
1
0
1
0
August
1.9
2
3
4
1
September
1.3
1
1
1
0
October
1.8
1
3
0
2
November
1.4
1
2
2
1
December
3.6
2
3
3
2
Average
1.7
1.8
1.4
1.4
1.8
1.5
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
7.6
10
8
6
7
7
February
8.7
9
9
7
8
8
March
9.9
11
11
9
10
8
April
10.0
10
11
10
10
May
8.9
8
10
9
8
June
7.9
9
7
8
8
July
6.2
6
6
6
6
August
5.9
7
7
6
5
September
6.2
6
6
6
7
October
7.1
7
7
8
6
November
6.8
7
8
5
7
December
6.6
6
7
7
6
Average
7.9
10.1
7.9
7.6
7.5
7.2
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
261°
260°
276°
275°
274°
February
263°
247°
256°
242°
252°
March
249°
252°
265°
248°
232°
April
256°
253°
245°
250°
May
223°
251°
236°
234°
June
245°
288°
255°
242°
July
150°
122°
111°
139°
August
125°
083°
149°
158°
September
224°
115°
305°
058°
October
203°
298°
261°
216°
November
302°
271°
335°
265°
December
312°
258°
248°
283°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.