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
99.3
98
100
100
99
100
February
97.7
95
97
99
100
98
March
98.8
99
98
98
99
99
April
99.3
100
100
100
100
May
98.6
100
99
100
100
June
98.0
100
100
100
100
July
96.6
100
99
97
100
August
97.8
100
97
90
98
September
98.7
100
99
100
99
October
99.6
100
99
99
100
November
99.0
100
96
100
100
December
98.0
100
97
99
98
Average
98.3
97.1
99.4
98.6
98.4
99.2
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
13.5
13
11
14
13
15
February
15.2
15
14
16
17
17
March
18.4
17
15
21
18
17
April
25.1
24
26
26
24
May
29.2
29
30
31
32
June
35.5
32
36
38
35
July
37.5
40
37
36
39
August
36.4
36
34
36
39
September
32.8
32
33
33
36
October
26.2
27
26
24
30
November
19.8
20
16
23
20
December
13.9
16
11
14
14
Average
24.1
15.0
24.6
25.4
25.6
26.3
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
0.7
1
1
0
0
1
February
1.3
3
0
0
1
0
March
4.4
5
3
4
3
5
April
8.0
6
9
10
8
May
11.2
13
13
13
14
June
17.3
16
19
22
17
July
22.3
23
24
23
22
August
21.7
22
22
22
22
September
17.0
16
18
18
18
October
9.6
10
11
9
11
November
4.2
4
1
6
4
December
0.5
1
-1
2
-1
Average
9.0
2.9
9.5
10.4
10.8
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.7
4
8
0
5
0
February
3.9
8
7
1
0
1
March
3.3
5
7
3
3
3
April
0.3
0
0
2
1
May
1.3
4
0
0
0
June
0.3
0
1
1
1
July
1.3
0
3
2
1
August
0.7
1
2
0
0
September
0.6
1
0
1
0
October
0.6
0
2
2
0
November
1.3
0
2
0
1
December
1.6
0
1
4
0
Average
2.0
5.9
2.3
1.2
1.4
0.6
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
8.0
7
10
7
8
8
February
9.7
9
12
11
10
9
March
10.6
11
11
11
11
10
April
10.7
10
12
11
10
May
10.7
10
12
11
11
June
10.6
10
11
11
12
July
9.7
10
10
9
11
August
8.9
8
7
10
10
September
8.7
8
8
8
8
October
8.6
8
7
9
9
November
8.6
8
10
8
9
December
7.5
7
7
8
8
Average
9.4
8.8
9.3
9.7
9.4
9.5
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
308°
234°
016°
024°
323°
February
228°
223°
350°
311°
349°
March
227°
225°
267°
240°
227°
April
269°
247°
244°
237°
May
218°
236°
231°
229°
June
226°
221°
231°
222°
July
230°
175°
221°
227°
August
207°
166°
224°
228°
September
224°
205°
235°
290°
October
297°
101°
234°
283°
November
310°
268°
342°
251°
December
026°
207°
232°
004°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.