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
98.3
98
99
99
98
February
98.9
100
99
99
98
March
98.7
99
100
99
98
April
65.8
99
99
0
May
86.1
99
99
59
98
June
97.1
100
100
93
96
July
99.2
99
99
99
100
August
80.6
99
98
30
99
September
90.2
98
99
67
98
October
99.4
100
99
100
98
November
99.2
99
99
99
99
December
97.8
98
96
98
99
Average
94.4
98.8
99.1
98.9
76.8
98.3
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
13.7
14
14
14
13
February
16.3
17
15
16
17
March
19.9
20
20
21
20
April
26.2
26
28
25
May
30.8
29
32
31
34
June
34.4
34
34
35
35
July
35.7
39
35
33
36
August
33.8
35
32
32
36
September
31.1
33
31
31
31
October
25.4
27
22
26
28
November
19.4
19
16
21
21
December
14.6
15
14
17
13
Average
24.1
17.0
25.4
24.8
25.0
28.4
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
-3.2
-1
-2
-4
-4
February
-2.5
1
-2
-3
-2
March
2.1
3
3
1
2
April
7.0
6
7
8
May
10.7
11
11
11
12
June
14.9
15
17
17
11
July
20.2
21
20
20
21
August
19.0
20
19
18
19
September
14.5
16
15
15
13
October
7.8
9
9
8
6
November
1.7
3
-1
2
3
December
-2.4
-2
0
1
-4
Average
6.8
0.9
8.1
7.8
7.8
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.5
3
4
2
1
February
3.2
0
6
3
4
March
0.7
1
0
1
1
April
1.4
1
1
3
May
1.7
0
5
1
0
June
1.8
0
1
5
1
July
0.5
0
1
0
0
August
2.1
3
4
1
1
September
2.4
3
2
3
2
October
1.4
0
4
1
2
November
0.7
1
2
0
0
December
1.7
3
2
1
2
Average
1.5
1.2
1.5
2.4
1.6
1.0
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
8.3
8
9
8
8
February
9.9
9
12
10
9
March
10.6
10
11
10
11
April
10.2
10
11
10
May
9.4
8
10
10
8
June
8.1
9
7
8
8
July
6.0
6
6
6
7
August
6.0
6
7
6
6
September
6.3
7
6
6
6
October
7.8
7
7
9
8
November
7.8
7
9
7
8
December
8.8
8
8
10
8
Average
8.2
9.0
8.4
8.4
8.1
7.3
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
239°
225°
313°
280°
February
242°
228°
276°
236°
March
219°
222°
249°
221°
April
235°
234°
222°
May
214°
223°
207°
153°
June
227°
247°
213°
215°
July
165°
139°
156°
289°
August
103°
022°
164°
336°
September
236°
186°
292°
334°
October
222°
297°
242°
223°
November
285°
237°
330°
261°
December
327°
221°
221°
339°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.