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
82.5
80
76
86
60
85
February
81.9
94
85
83
100
76
March
84.8
79
89
89
0
76
April
89.6
92
86
92
100
93
May
93.7
93
94
98
95
June
93.5
91
95
91
97
July
93.8
98
93
89
96
August
91.8
93
90
91
90
September
92.7
97
93
89
90
October
90.2
98
91
89
86
November
87.9
93
85
99
84
December
77.0
78
62
78
85
Average
89.0
86.1
90.0
89.1
90.5
88.6
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
11.1
11
15
11
10
12
February
16.2
17
18
16
16
14
March
18.7
19
19
20
12
20
April
21.9
23
22
22
18
21
May
26.3
25
28
25
25
June
29.4
29
31
29
29
July
31.1
32
32
30
32
August
30.8
32
30
30
31
September
28.6
28
28
27
27
October
23.0
23
22
23
23
November
16.6
18
17
17
19
December
13.5
14
13
17
11
Average
22.2
17.4
22.9
22.8
24.3
21.9
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
1.8
0
5
0
6
2
February
5.6
4
7
4
14
4
March
8.3
8
7
7
12
11
April
11.2
11
11
10
12
10
May
16.2
16
17
14
14
June
20.3
19
21
20
19
July
22.2
22
21
22
22
August
21.7
22
22
22
22
September
18.6
18
17
17
18
October
12.6
12
9
14
15
November
5.8
7
8
4
9
December
4.5
3
7
8
2
Average
13.1
6.0
12.3
12.0
14.7
12.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.8
13
6
10
20
14
February
10.2
6
8
8
0
22
March
9.2
13
8
5
0
18
April
6.0
8
8
3
0
6
May
3.9
3
4
3
6
June
4.3
3
2
7
5
July
2.7
1
4
4
3
August
4.7
1
2
8
7
September
3.7
2
2
7
12
October
5.7
1
1
6
9
November
5.9
6
6
1
3
December
13.2
12
16
8
8
Average
7.2
9.9
4.5
4.5
5.4
9.0
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
6.5
7
6
6
5
7
February
6.4
6
6
7
12
7
March
6.9
6
6
8
0
6
April
6.9
7
7
6
4
7
May
6.0
7
6
6
6
June
5.2
5
5
5
6
July
4.6
5
5
5
4
August
4.7
5
4
5
5
September
4.8
5
5
4
6
October
5.7
6
6
5
5
November
6.0
6
6
6
7
December
6.0
6
5
5
6
Average
5.7
6.6
5.8
5.7
5.0
6.0
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
293°
265°
289°
270°
290°
February
251°
251°
269°
292°
266°
March
322°
246°
253°
360°
231°
April
242°
235°
238°
144°
284°
May
122°
223°
232°
253°
June
255°
261°
209°
243°
July
284°
250°
254°
245°
August
270°
225°
179°
248°
September
112°
070°
317°
112°
October
255°
274°
262°
137°
November
072°
067°
288°
005°
December
284°
178°
236°
288°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.