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
91.3
91
80
92
87
96
February
89.0
90
88
92
69
92
March
92.3
84
91
88
93
92
April
95.1
87
96
95
98
May
95.0
87
93
93
99
June
85.0
93
96
88
25
July
90.0
95
95
94
60
August
93.5
95
92
86
90
September
92.9
92
90
92
85
October
92.9
92
89
87
90
November
90.7
88
87
98
83
December
86.7
87
75
79
91
Average
91.2
88.0
89.9
91.2
88.6
82.3
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
14
17
14
14
16
February
19.2
18
21
19
16
17
March
22.0
21
22
23
22
23
April
24.9
25
24
24
24
May
28.7
27
30
28
28
June
31.3
30
33
31
31
July
32.4
33
32
32
33
August
31.9
34
31
32
32
September
30.2
30
29
29
28
October
25.4
25
24
25
26
November
19.3
19
20
19
22
December
16.3
16
17
20
15
Average
24.3
17.8
24.8
24.8
24.2
24.4
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
4.4
3
7
3
5
7
February
8.2
7
10
6
6
7
March
10.4
11
10
10
10
13
April
12.8
13
12
12
12
May
17.1
16
17
15
15
June
20.7
19
21
20
20
July
21.9
23
23
22
22
August
22.0
22
22
22
22
September
19.0
18
17
18
19
October
14.8
13
15
15
16
November
8.2
8
10
6
11
December
6.5
5
9
10
3
Average
13.4
6.9
13.6
13.8
13.4
13.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.5
4
7
7
9
9
February
7.7
7
4
4
12
16
March
5.5
9
4
4
5
10
April
3.8
5
3
4
5
May
3.7
4
2
2
2
June
4.7
3
4
8
0
July
3.0
1
3
5
3
August
4.7
5
2
6
4
September
3.1
3
2
6
7
October
4.9
6
2
6
1
November
5.6
7
5
0
5
December
7.3
6
4
6
7
Average
5.1
7.0
4.3
3.3
5.6
5.4
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
6.2
7
6
6
6
6
February
6.4
7
7
6
6
6
March
6.7
6
6
7
7
6
April
6.3
6
6
6
7
May
5.1
6
6
6
6
June
4.8
6
5
5
6
July
4.3
4
4
4
5
August
4.4
5
4
4
4
September
5.1
5
5
4
6
October
5.5
6
6
4
6
November
5.5
6
6
5
5
December
5.7
6
5
5
6
Average
5.6
6.6
5.6
5.6
5.2
5.6
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
339°
267°
304°
286°
341°
February
353°
257°
282°
347°
274°
March
352°
304°
256°
075°
237°
April
359°
236°
287°
307°
May
020°
241°
322°
308°
June
331°
036°
343°
287°
July
324°
238°
329°
238°
August
344°
226°
107°
228°
September
029°
044°
039°
053°
October
005°
015°
324°
056°
November
016°
030°
004°
032°
December
351°
280°
252°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.