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
88.2
89
84
92
89
86
February
80.8
92
87
80
78
77
March
93.0
91
96
94
93
88
April
92.0
93
87
94
96
91
May
93.4
95
94
92
96
June
92.2
95
97
86
93
July
93.0
91
96
90
91
August
90.9
86
92
90
94
September
93.2
95
94
91
90
October
91.0
96
96
90
83
November
91.5
94
92
95
93
December
85.1
92
75
85
92
Average
90.6
91.5
91.4
92.4
89.6
89.8
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
12.4
10
16
12
12
14
February
16.7
19
19
16
12
16
March
20.6
21
21
21
22
23
April
23.3
24
23
24
23
24
May
28.4
28
29
26
27
June
31.8
31
33
30
32
July
33.3
33
34
32
34
August
32.0
31
32
32
32
September
30.3
31
30
29
28
October
25.2
26
24
26
26
November
19.3
19
19
18
20
December
15.2
16
16
20
14
Average
22.5
18.2
24.4
24.4
23.5
24.1
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
1.6
0
5
0
2
5
February
4.7
5
7
2
1
5
March
7.9
8
8
6
9
12
April
10.1
12
10
10
9
10
May
15.9
15
17
15
15
June
19.3
18
20
20
20
July
22.1
22
23
22
23
August
20.4
18
22
21
20
September
17.8
17
16
18
18
October
12.1
11
8
14
13
November
5.8
5
6
3
6
December
4.3
3
8
8
1
Average
10.2
6.1
11.8
11.7
11.8
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.6
10
5
6
7
11
February
10.2
6
6
8
9
18
March
6.4
7
6
4
6
11
April
7.0
7
10
6
2
7
May
3.8
4
3
4
4
June
5.6
3
2
11
6
July
5.8
4
4
4
5
August
4.1
2
6
10
3
September
3.6
3
2
4
7
October
4.7
4
3
2
5
November
4.7
3
5
6
4
December
6.5
2
10
5
3
Average
5.7
7.3
4.2
4.4
5.9
6.7
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
6.3
7
6
7
6
6
February
6.7
7
7
7
6
7
March
6.8
6
7
7
7
7
April
6.3
7
6
7
6
6
May
4.9
5
6
5
5
June
4.1
4
4
4
5
July
3.5
3
4
3
3
August
3.4
3
3
4
4
September
3.6
4
4
3
4
October
4.9
6
6
4
4
November
5.1
5
5
5
5
December
5.6
5
5
6
6
Average
5.3
6.5
5.0
5.2
4.9
4.9
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
280°
219°
323°
271°
195°
February
211°
207°
226°
320°
266°
March
220°
242°
213°
155°
204°
April
192°
235°
185°
222°
305°
May
173°
183°
129°
179°
June
235°
336°
166°
194°
July
248°
213°
208°
198°
August
337°
189°
155°
284°
September
020°
009°
061°
023°
October
234°
214°
196°
357°
November
302°
344°
277°
357°
December
223°
206°
182°
247°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.