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
82.7
81
68
86
81
88
February
80.8
95
87
79
69
74
March
87.0
82
84
80
89
84
April
91.2
95
84
88
97
94
May
91.9
92
92
97
91
June
92.5
86
97
92
95
July
94.1
97
93
92
98
August
91.8
91
91
95
89
September
92.4
96
90
91
86
October
91.3
98
88
88
90
November
86.5
91
82
95
87
December
78.1
79
54
76
89
Average
88.8
88.2
87.8
86.3
89.3
89.0
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
13.3
12
15
12
13
14
February
17.2
17
19
17
15
15
March
20.0
20
20
20
22
21
April
23.6
24
23
23
24
24
May
27.7
25
29
27
26
June
30.7
29
33
31
31
July
32.6
32
32
32
34
August
31.5
32
31
32
32
September
29.6
29
28
29
28
October
24.6
24
23
25
25
November
18.0
18
18
18
21
December
14.4
15
13
18
14
Average
23.0
18.0
23.3
23.6
23.9
23.8
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
1
4
1
3
5
February
6.1
5
8
5
4
5
March
7.8
8
8
8
9
11
April
10.8
12
11
10
11
11
May
15.8
15
17
15
14
June
19.5
18
21
20
20
July
21.6
21
22
22
22
August
21.1
21
21
22
22
September
18.1
17
17
18
19
October
12.5
11
9
13
14
November
6.4
6
8
5
9
December
4.7
4
6
8
3
Average
11.6
6.3
11.9
12.2
12.5
13.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.9
10
9
12
8
12
February
8.1
5
7
9
8
16
March
7.4
12
8
9
4
11
April
5.6
5
11
5
3
4
May
3.7
3
3
3
4
June
4.1
8
0
4
2
July
2.3
2
4
3
1
August
4.2
5
2
7
5
September
3.5
2
4
5
8
October
4.3
2
4
8
2
November
6.4
7
12
1
2
December
10.4
8
15
8
5
Average
5.8
8.1
5.9
5.8
5.0
5.6
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
5.6
6
5
6
5
6
February
5.6
6
5
6
6
6
March
5.7
6
5
6
6
5
April
5.1
5
6
5
5
6
May
4.6
6
5
5
5
June
4.1
5
5
4
5
July
3.3
4
3
3
4
August
3.4
4
3
4
3
September
4.3
4
5
4
6
October
4.7
5
5
4
5
November
5.0
6
6
4
5
December
5.3
5
5
5
5
Average
4.8
5.8
4.9
4.7
4.4
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
297°
280°
317°
295°
335°
February
314°
273°
351°
348°
281°
March
357°
308°
283°
072°
328°
April
284°
020°
288°
284°
284°
May
055°
354°
010°
003°
June
345°
039°
063°
327°
July
309°
268°
307°
329°
August
004°
062°
080°
041°
September
045°
050°
025°
056°
October
358°
026°
360°
062°
November
048°
039°
329°
046°
December
351°
058°
257°
292°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.