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
99
98
100
99
98
February
97.9
95
98
100
99
99
March
98.6
100
99
94
100
99
April
99.8
99
100
100
100
100
May
99.6
100
100
100
100
June
99.4
99
99
99
99
July
98.3
99
97
98
99
August
98.4
99
96
98
99
September
98.8
99
98
99
99
October
99.5
100
98
100
100
November
99.3
98
100
100
100
December
97.5
98
88
98
100
Average
98.8
98.4
98.8
98.0
99.2
99.3
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
18.3
17
17
19
18
19
February
19.2
20
18
20
21
19
March
22.6
20
21
23
22
21
April
27.5
26
28
29
27
27
May
30.9
30
33
31
33
June
36.0
35
36
37
36
July
34.7
38
34
32
36
August
33.5
35
31
32
37
September
32.5
35
32
32
34
October
28.3
30
25
28
32
November
23.7
23
20
26
25
December
18.7
20
18
20
19
Average
26.4
20.5
27.2
27.0
27.1
28.0
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
1.7
2
1
1
1
2
February
2.5
3
2
1
2
3
March
5.1
5
5
4
4
6
April
8.3
7
7
9
10
8
May
11.3
11
12
12
12
June
17.0
15
19
19
17
July
20.2
22
20
20
21
August
18.9
21
19
19
20
September
16.4
17
17
16
17
October
10.9
12
11
9
11
November
6.1
7
3
6
7
December
3.0
3
4
4
1
Average
9.4
4.3
9.9
10.2
10.3
10.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.2
4
6
1
4
3
February
5.0
7
9
2
0
4
March
1.9
2
2
1
1
5
April
0.4
2
0
0
1
0
May
0.5
1
0
0
1
June
0.9
0
4
0
1
July
4.1
0
2
10
4
August
2.6
1
4
4
2
September
1.9
3
2
3
0
October
2.2
1
4
6
0
November
1.3
0
1
0
1
December
3.8
6
11
4
0
Average
2.4
3.5
2.2
2.2
2.7
1.8
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
5.7
5
7
5
6
5
February
7.1
6
9
7
7
6
March
7.3
8
7
7
8
8
April
7.3
7
6
8
8
7
May
7.4
7
7
8
6
June
6.5
7
6
6
8
July
4.7
4
5
4
5
August
3.9
4
4
4
4
September
5.4
6
5
5
5
October
5.6
6
5
6
5
November
4.8
6
5
4
5
December
5.1
4
4
6
6
Average
6.0
6.6
6.2
5.9
5.9
5.9
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
225°
227°
207°
198°
245°
February
218°
215°
211°
245°
230°
March
216°
231°
235°
219°
190°
April
217°
227°
219°
220°
212°
May
203°
214°
209°
207°
June
222°
203°
216°
209°
July
259°
216°
231°
224°
August
174°
225°
223°
242°
September
217°
153°
213°
214°
October
205°
212°
208°
230°
November
218°
204°
213°
206°
December
223°
220°
201°
201°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.