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
83
75
90
78
February
98.1
96
100
98
98
March
99.0
97
99
99
100
98
April
99.6
99
100
100
100
May
99.7
100
100
June
99.5
99
99
100
100
July
100.0
100
100
100
100
August
99.5
100
100
100
98
September
98.3
99
100
100
93
October
98.5
98
100
96
100
November
92.1
99
98
76
95
December
85.2
96
80
72
89
Average
93.8
89.7
98.8
96.9
93.6
95.0
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
13.8
14
14
15
12
February
16.1
16
16
17
19
March
18.5
17
16
22
19
18
April
24.1
23
24
26
21
May
26.1
27
28
June
32.7
29
33
37
34
July
36.1
37
36
38
36
August
35.5
35
37
36
36
September
31.9
30
34
33
32
October
25.8
26
27
24
28
November
18.2
20
16
18
18
December
13.5
16
11
12
14
Average
22.1
15.3
26.1
25.3
24.5
24.3
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
2.5
4
2
2
2
February
3.2
6
1
3
2
March
6.4
13
5
6
4
6
April
8.1
7
8
8
8
May
11.2
12
10
June
15.6
14
15
20
15
July
18.2
18
19
20
17
August
18.2
18
19
18
19
September
15.0
15
17
14
15
October
8.6
9
10
8
10
November
2.9
3
1
5
2
December
2.4
3
2
3
0
Average
8.2
7.3
10.5
9.5
9.4
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.8
5
0
1
2
February
4.0
3
2
0
1
March
3.5
3
6
4
1
4
April
0.2
0
1
0
0
May
2.0
0
0
June
0.4
1
1
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.5
0
0
3
0
November
2.2
1
2
0
2
December
5.5
5
2
14
2
Average
2.2
4.0
1.1
0.8
1.6
1.1
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
2.1
2
2
2
2
February
2.8
3
3
2
2
March
3.1
4
4
3
3
3
April
3.7
4
4
3
3
May
4.0
4
4
June
3.9
4
4
4
4
July
3.4
3
3
3
3
August
3.2
3
3
3
3
September
2.7
3
3
3
2
October
2.4
3
2
3
2
November
2.0
2
2
2
2
December
2.0
2
2
2
2
Average
2.7
2.7
3.2
3.0
2.7
2.5
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
337°
329°
209°
265°
February
180°
341°
327°
305°
March
308°
303°
328°
316°
297°
April
328°
328°
326°
299°
May
318°
333°
June
322°
339°
331°
326°
July
344°
334°
340°
333°
August
343°
338°
328°
330°
September
326°
332°
339°
331°
October
343°
338°
347°
316°
November
351°
337°
294°
328°
December
358°
285°
343°
343°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.