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
82.6
60
77
85
91
84
February
79.8
46
86
89
72
84
March
87.6
62
88
86
92
88
April
92.0
82
91
94
94
May
93.2
93
89
95
95
June
92.6
90
95
93
97
July
91.1
90
89
90
92
August
91.9
94
88
95
94
September
93.9
94
92
92
92
October
90.7
89
87
90
92
November
86.2
87
82
95
90
December
84.3
91
81
85
84
Average
86.1
56.2
88.2
88.1
90.7
90.8
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
16.0
15
18
15
15
17
February
19.9
19
22
19
17
18
March
22.4
22
23
23
23
24
April
25.3
25
25
25
25
May
29.0
27
30
29
28
June
31.6
31
34
31
32
July
32.9
34
32
32
33
August
32.7
35
32
32
33
September
31.1
31
30
30
29
October
26.4
26
25
26
27
November
20.1
20
21
20
23
December
17.1
16
18
21
16
Average
24.6
18.8
25.5
25.6
25.1
25.4
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
2.8
2
4
1
3
5
February
6.7
5
8
4
6
6
March
7.8
8
8
7
9
12
April
10.2
11
9
10
11
May
14.8
15
15
13
14
June
19.2
18
19
20
20
July
20.8
22
21
20
22
August
20.9
21
20
21
22
September
18.3
18
17
17
19
October
12.3
8
6
14
15
November
6.1
7
8
3
9
December
4.6
3
8
7
1
Average
11.2
4.4
11.8
11.3
11.9
12.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.7
9
11
13
11
11
February
9.7
12
10
9
10
18
March
7.0
15
8
6
7
9
April
5.5
12
6
4
6
May
4.9
9
5
2
4
June
6.8
7
5
11
5
July
4.4
5
5
8
4
August
6.8
7
11
6
6
September
4.7
2
9
6
8
October
5.3
5
2
7
4
November
6.5
12
8
1
5
December
10.4
10
9
9
8
Average
7.1
11.6
7.9
7.0
6.7
6.9
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
5.5
6
5
5
5
5
February
5.6
6
6
6
6
5
March
5.8
5
5
7
5
5
April
5.4
5
6
5
5
May
4.4
4
5
4
5
June
3.8
4
4
4
4
July
3.1
3
3
3
3
August
3.6
4
3
4
3
September
4.4
4
5
3
5
October
4.4
5
4
4
5
November
4.5
5
5
4
5
December
4.6
4
4
4
5
Average
4.7
5.7
4.4
4.6
4.1
4.6
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
293°
255°
293°
269°
318°
February
003°
247°
241°
299°
247°
March
355°
265°
228°
026°
222°
April
058°
224°
267°
285°
May
001°
210°
147°
019°
June
268°
011°
165°
205°
July
261°
208°
219°
216°
August
290°
241°
144°
195°
September
050°
026°
006°
030°
October
337°
330°
274°
019°
November
003°
347°
325°
347°
December
310°
041°
229°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.