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
87.2
87
81
92
86
February
88.5
94
93
95
90
82
March
87.3
86
90
84
100
64
April
93.6
89
95
97
94
May
93.4
94
93
95
92
June
93.7
92
97
93
91
July
93.1
92
88
96
97
August
91.4
95
83
90
95
September
93.2
92
88
96
October
90.6
94
89
November
87.5
92
86
99
December
83.3
90
74
78
Average
90.5
88.7
91.3
89.0
93.2
87.3
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
15.4
15
17
19
16
February
18.8
18
21
21
12
16
March
21.4
22
22
23
16
23
April
24.7
25
25
25
24
May
28.5
26
31
28
27
June
31.5
31
35
31
30
July
33.3
34
34
32
34
August
32.2
34
32
32
33
September
31.2
30
31
28
October
25.5
25
24
November
18.1
20
20
17
December
16.1
17
16
20
Average
24.2
18.1
24.9
26.6
25.7
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
4.6
3
6
8
7
February
7.9
6
9
8
9
6
March
9.1
10
9
10
16
12
April
11.8
12
12
11
11
May
17.0
16
19
15
15
June
20.5
20
22
21
20
July
22.6
23
24
22
23
August
22.5
23
23
24
23
September
20.4
19
23
20
October
14.4
13
11
November
7.3
8
9
5
December
6.3
5
8
9
Average
13.1
6.2
13.6
15.3
15.3
13.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.2
7
8
3
11
February
7.9
8
7
3
10
18
March
6.5
12
6
6
0
10
April
4.1
5
4
3
5
May
4.0
5
4
3
4
June
3.8
4
3
5
3
July
2.7
6
6
4
2
August
4.2
3
7
6
0
September
2.9
5
4
8
October
5.5
6
2
November
8.1
12
10
1
December
10.3
9
9
8
Average
5.6
8.7
6.0
5.3
4.3
6.8
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
4.6
6
4
6
5
February
4.1
5
5
5
3
4
March
4.6
5
5
5
7
4
April
4.0
4
4
4
5
May
3.5
5
3
4
4
June
2.8
4
3
3
3
July
2.5
3
2
2
3
August
2.5
3
2
3
2
September
3.5
4
4
3
October
4.1
5
4
November
3.9
5
5
4
December
3.9
4
4
3
Average
3.7
5.0
4.2
3.5
2.9
3.8
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°
297°
253°
334°
February
323°
289°
269°
021°
311°
March
323°
303°
266°
080°
273°
April
327°
271°
264°
300°
May
003°
273°
323°
318°
June
306°
339°
327°
322°
July
305°
256°
266°
302°
August
328°
010°
070°
251°
September
040°
073°
049°
October
338°
327°
November
001°
351°
298°
December
302°
345°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.