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
76
75
92
79
84
February
82.5
95
81
77
68
87
March
86.4
72
88
86
90
85
April
91.0
84
93
97
97
May
91.4
93
93
98
81
June
93.3
86
96
93
96
July
93.1
86
89
95
97
August
91.2
87
90
95
88
September
85.4
93
88
92
88
October
89.3
92
87
93
89
November
87.3
93
82
99
85
December
81.6
81
68
85
85
Average
87.5
79.9
86.8
87.6
90.9
88.6
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
12.1
12
14
11
11
13
February
16.0
16
18
16
12
15
March
18.3
19
19
20
19
20
April
22.8
22
23
23
22
May
26.4
24
27
27
24
June
29.9
28
31
30
29
July
31.7
30
32
32
33
August
31.0
31
31
32
31
September
26.7
28
28
28
27
October
23.8
24
22
25
24
November
17.1
18
18
17
20
December
13.7
14
12
18
13
Average
21.6
15.3
22.4
22.9
22.8
22.4
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
1.4
1
4
0
1
4
February
4.4
3
7
3
2
4
March
6.4
7
7
7
7
10
April
9.8
10
9
8
10
May
14.9
14
16
13
13
June
19.0
17
19
19
19
July
20.9
18
22
21
22
August
20.5
21
20
21
20
September
16.1
16
16
16
17
October
11.5
10
9
13
12
November
5.0
4
7
3
8
December
2.9
3
4
6
1
Average
10.2
3.5
10.7
11.2
10.9
11.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.9
20
9
11
10
15
February
10.0
10
7
11
16
15
March
9.4
14
10
12
7
8
April
8.1
19
5
3
5
May
5.6
10
3
3
9
June
4.2
9
1
4
4
July
2.3
1
3
5
3
August
4.4
6
3
5
5
September
4.9
4
7
5
7
October
5.4
3
5
5
5
November
7.3
6
14
2
4
December
11.7
15
15
6
8
Average
7.5
14.6
8.2
6.7
5.5
7.0
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
5.6
6
6
6
5
6
February
6.1
7
6
6
5
6
March
6.2
5
6
7
6
6
April
6.2
6
7
6
7
May
5.4
6
6
5
5
June
4.9
5
5
5
5
July
4.4
3
5
5
4
August
4.0
4
4
4
4
September
3.9
4
5
4
4
October
4.3
4
4
5
4
November
4.5
4
5
5
4
December
4.8
5
4
6
5
Average
5.1
6.0
4.8
5.2
5.1
5.0
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
260°
242°
278°
285°
291°
February
239°
232°
251°
292°
232°
March
312°
250°
242°
265°
238°
April
234°
236°
266°
269°
May
324°
267°
261°
293°
June
269°
285°
232°
247°
July
262°
228°
232°
250°
August
274°
240°
218°
231°
September
014°
002°
277°
021°
October
292°
323°
266°
318°
November
010°
289°
304°
275°
December
266°
272°
229°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.