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
99
100
100
100
100
February
98.2
97
96
99
100
100
March
99.1
98
99
99
100
99
April
99.8
100
100
100
100
May
99.1
98
99
100
100
June
99.6
100
99
100
100
July
100.0
100
100
100
100
August
99.4
99
100
100
98
September
98.4
100
100
98
93
October
99.1
100
100
95
100
November
99.0
99
99
100
100
December
97.6
99
100
98
100
Average
99.1
98.0
99.0
99.3
99.1
99.0
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
8.3
15
12
15
0
0
February
9.2
15
13
18
0
0
March
11.1
18
15
22
0
0
April
13.2
24
25
0
0
May
14.4
27
29
0
0
June
14.5
30
34
1
0
July
21.5
38
37
38
0
August
20.2
32
37
37
0
September
18.8
28
33
34
0
October
15.1
26
27
24
0
November
11.0
19
16
22
0
December
6.4
14
12
13
0
Average
13.8
15.8
22.9
25.7
14.2
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
1.3
3
2
0
0
0
February
1.3
4
0
0
0
0
March
2.9
4
3
6
0
0
April
4.6
6
9
0
0
May
6.0
10
13
0
0
June
6.7
13
18
0
0
July
12.2
22
22
21
0
August
11.8
21
23
21
0
September
9.8
16
18
17
0
October
5.6
10
12
9
0
November
2.6
3
2
7
0
December
1.3
5
0
2
0
Average
5.3
3.7
9.0
10.3
6.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.0
2
5
0
1
0
February
3.1
10
4
1
1
0
March
2.3
5
5
1
1
1
April
1.2
0
0
0
10
May
0.5
2
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.1
0
0
0
0
September
0.4
1
1
0
0
October
0.4
0
1
2
0
November
1.0
2
2
0
0
December
3.6
0
5
8
1
Average
1.6
5.5
1.6
0.7
0.8
0.8
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
6.9
8
10
6
5
6
February
7.9
8
10
8
7
6
March
9.0
10
11
10
7
9
April
8.7
8
10
7
8
May
8.4
9
10
7
7
June
7.1
8
9
6
7
July
6.8
8
8
7
7
August
6.2
9
6
8
6
September
6.0
7
6
7
5
October
6.1
7
6
8
5
November
6.0
7
9
6
5
December
5.5
6
6
8
6
Average
7.0
9.0
8.5
7.9
6.9
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
245°
196°
024°
134°
268°
February
199°
209°
010°
269°
349°
March
222°
211°
225°
243°
171°
April
245°
254°
236°
217°
May
187°
248°
238°
216°
June
188°
215°
191°
187°
July
187°
179°
156°
177°
August
168°
153°
159°
190°
September
161°
151°
168°
131°
October
245°
146°
209°
320°
November
329°
230°
346°
248°
December
225°
209°
198°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.