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
82.4
76
95
62
95
80
February
95.2
95
86
99
95
97
March
94.4
99
73
96
100
96
April
98.5
99
100
98
98
May
99.5
100
100
100
100
June
99.7
99
100
100
100
July
99.1
100
100
100
99
August
84.3
99
100
100
92
September
82.7
100
100
96
84
October
93.2
97
100
84
98
November
91.9
99
97
72
95
December
77.8
87
68
46
87
Average
91.7
90.3
94.6
94.5
91.2
94.1
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
15.3
15
15
15
16
14
February
17.7
18
15
20
19
20
March
19.8
20
14
23
21
20
April
25.6
25
26
27
23
May
29.6
29
31
31
31
June
35.0
32
36
37
35
July
37.9
39
38
40
37
August
31.8
36
38
38
38
September
28.8
32
35
34
34
October
27.0
29
29
26
30
November
20.5
22
18
20
20
December
14.8
18
13
10
16
Average
24.5
17.8
25.4
27.3
26.4
26.4
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
4.5
6
5
3
3
4
February
4.0
7
2
2
4
3
March
6.2
7
5
7
5
6
April
8.9
8
8
8
10
May
12.5
13
13
12
13
June
16.2
15
16
18
16
July
19.3
20
19
21
18
August
16.6
19
20
19
20
September
14.0
16
18
16
17
October
10.6
12
13
10
13
November
5.7
6
4
7
5
December
3.6
5
4
3
2
Average
9.7
6.3
10.3
10.8
10.6
10.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.8
11
17
0
4
1
February
5.7
5
7
3
0
0
March
5.0
5
9
5
2
4
April
2.0
0
1
1
6
May
0.9
1
0
0
1
June
0.3
2
0
0
0
July
0.0
0
0
0
0
August
0.4
3
0
0
0
September
0.2
0
1
0
0
October
0.6
0
0
4
0
November
2.7
2
3
2
3
December
4.9
5
7
9
2
Average
2.9
6.8
3.6
1.4
1.6
1.3
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
3.2
3
4
1
4
3
February
3.7
4
3
2
4
4
March
4.1
5
3
3
5
5
April
4.6
5
1
6
5
May
4.9
6
0
6
6
June
5.1
6
0
6
6
July
5.9
6
5
6
6
August
4.8
6
6
6
6
September
4.2
5
5
5
5
October
4.2
4
4
4
4
November
3.5
4
4
3
3
December
3.0
3
3
2
3
Average
4.3
3.9
4.6
2.7
4.7
4.7
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
276°
107°
260°
265°
262°
February
215°
265°
252°
275°
252°
March
244°
240°
210°
268°
271°
April
274°
209°
269°
244°
May
263°
360°
273°
273°
June
258°
360°
265°
269°
July
259°
269°
274°
269°
August
265°
269°
275°
266°
September
260°
258°
278°
273°
October
289°
275°
288°
272°
November
309°
284°
275°
295°
December
296°
197°
317°
288°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.