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
98.1
99
100
100
100
100
February
97.8
100
98
100
90
100
March
99.6
100
100
100
100
99
April
94.5
69
100
98
98
May
99.2
100
100
99
99
June
99.7
100
100
100
99
July
99.3
100
100
100
96
August
99.8
100
100
100
99
September
99.5
100
99
100
99
October
98.5
98
99
98
100
November
93.0
99
100
100
90
December
98.0
99
100
100
99
Average
98.3
99.4
96.9
99.8
98.8
98.1
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
12.7
16
12
16
16
16
February
15.7
16
15
19
16
20
March
18.9
19
15
22
19
17
April
23.0
17
26
27
15
May
28.7
28
29
31
30
June
35.0
31
36
38
34
July
39.0
40
38
40
38
August
38.0
36
39
38
39
September
32.7
31
35
35
36
October
23.6
27
28
25
31
November
17.3
20
17
23
20
December
11.9
17
12
13
16
Average
23.7
16.8
24.1
26.9
26.8
26.1
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
0.3
2
1
-2
-1
-1
February
0.7
4
-1
-3
1
0
March
3.9
5
3
3
2
4
April
6.8
3
8
7
5
May
11.0
11
11
11
11
June
15.8
14
16
18
14
July
19.4
20
22
23
16
August
19.2
18
21
19
19
September
14.1
14
17
13
13
October
6.5
7
10
7
8
November
0.7
0
0
3
0
December
-1.9
1
-1
0
-2
Average
7.6
3.6
7.5
8.9
8.6
7.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.8
3
9
0
0
0
February
3.7
12
5
1
1
0
March
2.6
4
7
2
1
3
April
1.3
0
0
0
8
May
0.7
1
0
0
0
June
0.1
0
1
0
0
July
0.2
1
0
1
0
August
1.1
7
1
0
0
September
0.1
0
0
0
0
October
0.2
0
0
1
0
November
1.0
0
2
0
0
December
3.8
5
2
6
0
Average
1.9
5.9
2.8
0.7
0.7
0.9
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
5.5
7
8
3
5
6
February
7.3
7
8
6
6
6
March
9.1
11
12
7
9
9
April
9.8
8
11
10
9
May
9.4
10
10
9
9
June
8.3
9
8
9
9
July
7.3
8
7
7
8
August
6.7
7
5
7
7
September
6.1
6
6
6
4
October
5.4
6
4
7
4
November
5.0
5
7
4
4
December
4.9
4
6
6
6
Average
7.3
8.4
7.5
6.9
7.1
6.7
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
240°
231°
047°
325°
236°
February
205°
223°
272°
251°
330°
March
228°
225°
238°
244°
215°
April
236°
234°
229°
235°
May
207°
238°
222°
241°
June
199°
216°
196°
228°
July
203°
195°
190°
214°
August
196°
177°
197°
224°
September
196°
181°
207°
158°
October
234°
162°
224°
223°
November
257°
249°
229°
251°
December
219°
218°
224°
272°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.