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
84
89
90
83
89
February
86.0
94
91
90
64
88
March
89.2
85
92
90
86
90
April
92.8
92
95
95
95
95
May
88.6
92
80
95
86
June
89.3
90
96
91
93
July
94.8
96
96
97
August
92.1
92
95
88
94
September
87.0
88
93
93
84
October
86.9
93
92
90
75
November
91.6
93
92
98
90
December
83.8
87
87
89
84
Average
89.2
88.6
91.5
91.3
89.6
87.5
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
9.5
10
12
8
8
11
February
13.1
13
16
14
7
12
March
16.0
18
16
18
17
19
April
21.5
22
23
21
22
20
May
25.1
23
25
25
23
June
27.4
27
30
29
26
July
29.4
31
32
30
August
26.9
30
30
30
29
September
26.9
26
27
27
25
October
22.1
22
20
23
22
November
15.2
16
17
15
18
December
11.2
13
10
16
10
Average
19.7
15.7
21.2
21.2
20.8
18.8
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
-2.9
0
3
-3
-1
0
February
1.2
2
5
1
-1
1
March
3.7
5
5
5
3
6
April
6.6
10
9
8
6
5
May
9.1
12
14
11
4
June
9.5
15
17
11
13
July
11.3
21
20
16
August
10.1
20
20
12
12
September
10.7
16
15
17
4
October
7.7
10
9
12
3
November
2.6
3
6
3
2
December
0.5
2
2
3
-1
Average
5.6
4.2
10.0
9.8
7.5
3.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.4
3
3
5
0
0
February
0.6
0
1
3
0
0
March
0.6
3
1
1
0
0
April
0.7
2
1
3
0
0
May
0.8
2
3
0
0
June
0.7
4
1
0
0
July
0.5
0
3
0
August
0.3
1
1
0
0
September
0.2
1
1
0
0
October
0.0
0
0
0
0
November
0.6
1
4
0
0
December
0.3
0
3
0
0
Average
0.6
2.0
1.2
2.2
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
6.6
7
6
7
5
7
February
6.9
6
8
8
6
7
March
7.4
7
7
9
7
8
April
7.5
8
7
7
7
8
May
6.6
7
7
6
7
June
5.6
6
5
6
7
July
5.3
5
6
6
August
4.6
5
4
4
5
September
5.1
4
5
5
5
October
5.5
5
5
6
5
November
5.7
5
6
6
6
December
5.2
5
5
5
6
Average
6.2
7.0
5.6
6.2
5.8
6.4
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
255°
261°
287°
299°
271°
February
243°
238°
234°
316°
251°
March
283°
274°
239°
272°
237°
April
242°
224°
250°
272°
262°
May
007°
302°
264°
272°
June
278°
269°
222°
199°
July
233°
219°
226°
August
265°
245°
223°
229°
September
353°
320°
245°
010°
October
275°
308°
263°
277°
November
312°
260°
285°
227°
December
249°
290°
228°
261°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.