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
90.3
95
86
91
88
92
February
89.5
97
85
88
88
85
March
92.0
90
92
90
92
89
April
94.5
91
95
98
96
May
91.3
93
94
97
68
June
94.3
94
96
93
94
July
91.5
92
90
92
95
August
93.8
95
90
92
96
September
94.1
97
94
95
88
October
92.7
93
92
95
91
November
88.7
89
89
97
90
December
87.8
91
95
88
89
Average
92.1
93.9
91.7
92.0
93.3
89.1
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
15.9
16
18
15
15
18
February
19.8
18
22
20
18
18
March
21.4
22
22
23
22
23
April
24.7
26
25
24
25
May
27.2
26
30
28
20
June
30.1
30
33
30
30
July
31.3
33
33
30
33
August
31.5
33
31
32
32
September
29.4
29
29
29
28
October
25.0
25
24
23
27
November
19.6
20
21
19
23
December
16.9
17
17
21
16
Average
23.8
18.9
25.0
25.2
24.4
24.2
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
4.0
5
7
3
6
7
February
7.5
5
9
7
8
8
March
9.2
11
10
10
10
13
April
11.9
13
11
11
13
May
15.6
15
18
15
10
June
19.6
19
21
19
21
July
21.6
23
23
23
23
August
22.0
21
22
24
23
September
19.9
19
19
20
21
October
14.7
12
12
16
17
November
8.2
8
11
6
12
December
6.2
6
8
8
4
Average
12.7
6.9
13.5
13.9
14.0
14.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.2
3
6
2
4
3
February
3.9
5
5
4
2
7
March
4.1
4
5
3
2
6
April
3.0
4
1
1
4
May
3.2
4
4
2
1
June
3.9
2
3
4
4
July
2.7
2
5
2
2
August
4.2
3
4
4
6
September
3.6
0
3
4
7
October
2.4
2
1
3
3
November
4.4
6
3
3
3
December
5.1
4
3
5
1
Average
3.7
4.0
3.5
3.0
2.9
3.6
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
5.1
6
5
6
5
6
February
5.0
5
5
5
5
5
March
5.4
5
5
6
6
5
April
5.0
5
5
5
6
May
4.1
6
5
4
3
June
3.5
4
4
4
4
July
2.1
3
0
3
1
August
2.0
3
1
2
0
September
3.6
4
5
2
3
October
3.3
4
4
0
3
November
4.3
5
5
3
5
December
4.5
5
4
4
4
Average
4.1
5.3
4.4
4.0
3.6
3.6
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
275°
261°
334°
289°
314°
February
332°
255°
294°
215°
293°
March
299°
284°
242°
025°
270°
April
281°
267°
288°
275°
May
330°
303°
256°
299°
June
279°
349°
291°
306°
July
252°
301°
262°
001°
August
287°
313°
247°
360°
September
357°
006°
018°
036°
October
347°
357°
360°
025°
November
354°
358°
336°
016°
December
324°
329°
298°
294°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.