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
94.1
91
89
99
98
98
February
92.7
89
93
100
95
99
March
89.6
92
84
90
99
95
April
87.3
84
64
97
97
90
May
86.0
72
90
93
84
June
76.8
87
64
71
87
July
75.7
64
69
78
80
August
80.7
73
80
86
76
September
87.6
95
96
76
74
October
92.6
91
89
94
89
November
91.5
98
95
78
90
December
93.0
96
89
83
100
Average
86.9
88.8
82.8
87.1
86.9
87.8
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
18.0
18
16
19
20
19
February
17.5
17
16
21
18
19
March
17.5
17
15
19
17
17
April
18.6
18
17
20
19
19
May
19.0
18
19
19
21
June
20.9
20
22
21
22
July
22.6
22
22
22
22
August
23.8
24
24
23
24
September
23.9
24
27
22
24
October
23.6
23
24
22
24
November
20.8
22
20
21
20
December
18.5
20
16
15
20
Average
20.0
17.2
19.8
21.1
19.8
20.7
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
8.4
9
8
9
8
8
February
7.1
9
6
7
7
8
March
8.5
9
7
8
7
9
April
9.8
10
10
9
9
11
May
11.0
13
11
11
12
June
13.8
13
15
14
14
July
13.8
3
15
17
14
August
14.8
14
16
15
16
September
13.9
16
10
14
15
October
11.6
13
6
12
14
November
9.6
11
7
11
8
December
8.4
10
8
8
8
Average
10.7
9.2
10.2
10.1
11.0
11.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.5
6
15
1
3
0
February
6.8
15
8
0
0
0
March
6.7
9
17
3
1
7
April
1.8
4
2
1
0
5
May
2.3
6
0
2
2
June
2.7
2
1
2
3
July
0.8
1
2
1
2
August
1.4
4
0
3
3
September
0.3
0
1
1
0
October
0.7
0
1
3
1
November
1.9
2
4
1
0
December
5.4
6
11
12
2
Average
3.5
8.1
4.8
1.7
2.2
2.2
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
8.3
7
10
8
10
6
February
8.5
8
10
11
9
8
March
8.5
9
8
9
9
9
April
7.7
8
7
9
8
7
May
7.7
7
8
8
8
June
7.0
6
7
7
8
July
6.9
7
7
7
7
August
7.0
7
7
7
7
September
7.0
7
7
7
6
October
7.6
8
6
7
7
November
7.5
8
10
7
8
December
7.8
7
6
7
9
Average
7.6
7.9
7.6
7.8
7.7
7.4
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
236°
169°
080°
059°
284°
February
180°
265°
354°
289°
165°
March
241°
237°
251°
260°
224°
April
225°
250°
259°
260°
235°
May
240°
252°
251°
239°
June
240°
236°
239°
233°
July
233°
244°
248°
250°
August
246°
265°
247°
250°
September
246°
245°
248°
262°
October
252°
251°
243°
249°
November
078°
300°
345°
271°
December
104°
302°
255°
359°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.