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
87.0
89
81
88
87
90
February
78.3
93
81
80
73
79
March
89.3
87
90
92
74
82
April
93.9
93
90
96
98
95
May
94.2
94
96
92
95
June
89.1
93
65
90
96
July
92.1
92
89
86
93
August
91.1
94
89
91
91
September
93.9
96
91
88
94
October
90.1
95
95
87
November
89.5
94
92
97
88
December
79.4
85
64
80
88
Average
89.5
90.4
90.8
87.3
88.4
90.1
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
10.7
9
14
10
10
12
February
14.6
16
17
14
10
13
March
17.3
18
18
19
20
20
April
21.7
22
21
22
21
20
May
25.2
25
27
24
24
June
28.8
28
30
28
28
July
30.7
31
32
29
32
August
28.7
31
27
29
24
September
27.8
28
27
25
26
October
22.2
23
21
22
November
16.1
17
16
16
18
December
12.7
13
13
17
12
Average
20.8
16.3
22.1
21.7
21.1
20.9
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
2.2
1
5
0
3
5
February
5.1
5
7
3
1
4
March
7.1
8
8
7
11
11
April
10.2
12
11
10
9
9
May
14.6
15
17
14
14
June
18.9
18
20
19
19
July
20.4
20
21
21
19
August
18.9
21
18
21
13
September
17.7
17
16
19
17
October
12.0
12
9
13
November
5.8
6
7
4
8
December
4.5
4
8
7
2
Average
10.9
6.4
12.0
11.5
11.7
10.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.7
0
0
0
0
14
February
7.3
0
0
0
0
21
March
4.0
0
0
0
0
12
April
2.2
0
0
0
0
2
May
1.6
0
0
0
0
June
2.6
0
0
0
0
July
1.3
0
0
0
0
August
1.8
0
0
0
0
September
1.8
0
0
0
0
October
4.0
0
0
0
November
2.2
0
0
0
0
December
6.0
0
0
0
0
Average
2.8
3.7
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
6.4
6
7
7
6
6
February
6.3
7
7
7
6
7
March
6.8
6
7
7
6
7
April
6.2
7
6
7
6
7
May
4.7
5
6
5
5
June
4.1
4
4
4
5
July
3.4
4
4
4
3
August
3.5
3
3
4
4
September
4.0
2
5
4
5
October
4.8
4
6
4
November
5.3
5
6
6
5
December
5.8
6
6
6
5
Average
5.2
6.5
4.9
5.4
5.0
5.1
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
307°
257°
317°
291°
244°
February
244°
245°
242°
347°
288°
March
318°
271°
250°
009°
241°
April
247°
314°
236°
282°
317°
May
348°
224°
207°
233°
June
289°
003°
207°
252°
July
298°
247°
252°
265°
August
310°
235°
193°
290°
September
025°
035°
352°
087°
October
303°
341°
082°
November
042°
023°
266°
060°
December
270°
241°
225°
279°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.