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
92.9
96
93
87
92
94
February
96.9
96
96
99
95
97
March
96.5
98
96
93
99
98
April
96.6
94
98
99
94
May
94.1
88
97
93
96
June
91.3
94
91
85
92
July
88.1
88
85
88
93
August
87.4
95
95
89
78
September
90.5
93
96
93
73
October
94.1
94
85
96
95
November
90.3
100
98
97
97
December
92.0
88
86
88
96
Average
92.9
96.6
93.3
92.5
92.6
91.5
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
14.8
15
15
15
16
15
February
16.3
16
14
18
19
19
March
16.9
17
14
18
18
18
April
18.7
17
19
18
19
May
19.9
18
20
19
23
June
22.1
19
23
22
24
July
21.8
22
21
21
23
August
23.1
24
23
23
25
September
24.0
22
25
23
26
October
22.7
23
20
22
26
November
18.0
19
16
18
19
December
14.6
15
12
13
17
Average
19.0
15.6
18.5
19.2
19.2
21.1
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
7.7
9
8
7
8
8
February
7.4
8
5
6
8
9
March
8.7
10
7
8
8
9
April
10.3
9
10
10
12
May
11.9
12
11
11
14
June
13.6
13
13
14
15
July
14.1
13
14
14
15
August
15.1
15
15
15
17
September
14.7
15
15
14
16
October
11.7
12
12
12
14
November
8.4
9
6
10
9
December
6.9
8
5
7
7
Average
10.6
8.8
10.4
10.1
10.8
11.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.5
12
15
1
7
3
February
8.5
15
11
0
4
0
March
8.5
9
17
2
3
9
April
3.1
1
4
0
4
May
2.6
6
0
1
2
June
0.7
1
2
0
0
July
0.3
1
0
0
0
August
0.7
1
0
1
1
September
0.6
1
1
0
0
October
0.9
2
0
5
0
November
3.9
2
3
3
2
December
8.8
11
16
17
4
Average
4.7
12.1
5.3
1.9
3.1
2.0
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
6.7
7
9
5
7
6
February
8.0
8
9
7
7
7
March
8.4
9
10
8
8
8
April
8.9
9
10
9
8
May
9.8
9
10
10
9
June
9.3
9
8
10
10
July
9.3
9
9
10
9
August
8.5
8
8
9
9
September
7.8
8
8
8
7
October
7.1
7
7
9
6
November
6.1
6
7
6
7
December
6.1
5
6
7
6
Average
8.1
8.0
8.2
7.9
8.4
7.6
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
198°
182°
237°
257°
222°
February
180°
252°
282°
277°
282°
March
246°
222°
267°
255°
250°
April
274°
263°
264°
258°
May
260°
273°
271°
268°
June
270°
276°
277°
282°
July
285°
282°
290°
288°
August
286°
282°
291°
289°
September
274°
276°
287°
281°
October
278°
279°
264°
296°
November
285°
257°
273°
268°
December
188°
196°
221°
289°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.