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
81.8
76
84
93
90
80
February
83.5
94
84
85
78
90
March
92.7
96
85
95
98
84
April
90.9
93
94
88
94
82
May
94.3
97
92
91
92
June
96.5
94
95
95
100
July
97.4
94
99
97
98
August
97.0
98
96
98
100
September
94.5
94
99
98
91
October
90.5
91
95
95
88
November
90.6
95
80
97
98
December
72.8
89
65
91
85
Average
90.6
89.8
91.7
91.4
93.7
90.8
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
11.1
9
14
13
12
13
February
14.1
19
15
14
7
14
March
19.7
21
18
20
20
21
April
22.8
24
22
24
22
22
May
26.8
27
28
24
26
June
31.2
32
32
31
32
July
33.8
33
38
33
34
August
33.3
36
35
33
33
September
30.9
32
33
33
28
October
23.6
24
25
25
22
November
17.8
19
16
18
21
December
12.5
15
13
20
13
Average
22.5
17.9
23.9
24.4
23.1
23.0
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
-3
2
-3
1
3
February
2.4
7
4
-1
-3
3
March
7.6
9
7
5
8
11
April
10.7
13
10
12
10
9
May
16.1
15
18
16
15
June
20.5
20
21
20
21
July
22.8
22
25
22
24
August
22.3
23
23
23
21
September
18.6
19
18
18
18
October
11.6
12
11
13
10
November
5.6
7
5
6
8
December
2.8
3
5
7
1
Average
11.1
6.5
11.9
11.7
11.8
11.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.5
13
14
11
10
9
February
11.7
10
14
11
14
7
March
7.4
4
10
10
5
9
April
9.9
13
14
9
6
9
May
8.0
5
21
13
10
June
4.3
5
7
3
3
July
1.9
1
2
2
4
August
4.1
2
5
4
4
September
4.4
3
1
1
7
October
8.5
7
9
11
6
November
6.5
4
13
2
4
December
6.0
8
5
6
13
Average
7.1
10.1
6.9
8.7
6.2
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
7.4
6
8
9
7
6
February
8.4
9
7
9
8
8
March
8.3
8
8
9
9
8
April
8.0
8
7
9
8
7
May
6.2
5
7
5
7
June
5.4
4
5
5
6
July
5.1
5
6
5
5
August
5.0
5
5
5
5
September
5.2
5
5
6
5
October
6.7
7
6
7
7
November
7.0
6
6
7
7
December
6.0
7
7
8
7
Average
6.7
7.6
6.1
6.8
6.5
6.3
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
330°
266°
315°
304°
261°
February
238°
242°
314°
355°
297°
March
188°
268°
241°
193°
188°
April
212°
282°
207°
248°
259°
May
190°
177°
140°
065°
June
199°
165°
187°
194°
July
207°
202°
203°
183°
August
360°
169°
200°
155°
September
120°
225°
203°
007°
October
346°
262°
278°
016°
November
208°
217°
203°
191°
December
249°
310°
200°
267°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.