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
87.8
79
98
72
95
84
February
91.7
91
99
95
88
89
March
96.4
99
88
98
95
April
97.3
100
96
99
97
May
98.2
100
95
98
98
June
98.4
99
97
100
98
July
99.1
100
99
100
100
August
97.5
99
100
98
96
September
91.8
99
99
95
73
October
89.6
89
96
91
84
November
91.2
96
86
88
92
December
89.9
81
91
91
95
Average
93.4
84.9
96.7
93.3
95.6
92.0
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
7.8
7
9
7
9
8
February
7.2
9
7
8
7
8
March
9.7
10
10
10
9
April
12.2
11
11
13
13
May
15.5
17
13
15
17
June
17.7
17
18
20
17
July
19.1
20
18
20
19
August
19.7
20
21
20
19
September
17.6
17
19
17
19
October
13.6
14
15
13
13
November
9.9
10
8
11
10
December
7.6
10
5
5
9
Average
12.5
8.1
13.5
13.0
13.1
13.3
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
4.4
4
5
4
5
5
February
3.3
6
4
4
3
4
March
4.8
5
6
4
4
April
7.1
6
6
7
7
May
10.1
11
9
9
11
June
11.8
11
12
12
12
July
13.1
13
13
13
13
August
13.3
13
14
13
13
September
11.8
12
12
12
12
October
8.5
9
10
9
9
November
6.0
6
4
7
6
December
4.3
7
2
2
5
Average
7.8
4.7
8.5
8.1
8.0
8.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.6
18
9
16
15
32
February
17.0
12
16
12
19
19
March
9.9
8
16
9
10
April
10.7
9
11
8
6
May
6.3
4
12
5
8
June
4.7
5
6
1
10
July
1.8
2
3
0
3
August
1.6
2
0
2
2
September
7.4
4
2
12
7
October
12.7
11
11
17
11
November
17.6
7
16
35
18
December
19.3
18
14
23
17
Average
10.4
15.4
7.3
9.3
10.9
11.0
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
6.5
7
6
5
7
8
February
7.3
6
8
6
9
7
March
6.9
8
6
6
7
April
7.6
8
9
6
7
May
6.8
7
8
7
7
June
7.3
7
7
7
8
July
6.6
7
6
6
8
August
5.7
5
6
6
6
September
5.0
5
5
5
5
October
5.8
5
5
6
7
November
6.3
6
6
7
7
December
6.1
6
6
8
6
Average
6.5
6.4
6.5
6.3
6.6
6.9
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
036°
080°
002°
096°
253°
February
024°
243°
175°
262°
243°
March
091°
250°
201°
236°
April
185°
217°
218°
229°
May
220°
230°
218°
232°
June
215°
222°
211°
221°
July
213°
213°
215°
223°
August
213°
207°
217°
209°
September
212°
207°
209°
208°
October
050°
214°
126°
235°
November
322°
358°
254°
202°
December
051°
025°
319°
005°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.