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
93.9
96
89
95
97
97
February
94.6
92
98
100
94
97
March
94.2
95
86
97
99
98
April
97.0
92
99
99
95
May
96.9
93
97
98
96
June
94.9
99
94
94
96
July
95.4
89
94
97
97
August
97.0
96
98
97
97
September
96.3
99
97
97
91
October
95.7
89
100
96
92
November
95.0
99
99
86
97
December
93.8
96
96
83
98
Average
95.3
94.2
93.7
96.9
94.7
95.9
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
19.6
19
18
21
20
21
February
19.2
18
18
23
20
22
March
19.7
19
17
22
19
20
April
22.0
20
24
22
22
May
21.7
20
23
22
25
June
23.8
22
25
25
25
July
26.6
27
26
27
26
August
27.6
28
29
27
28
September
27.3
25
30
27
29
October
26.0
25
25
25
27
November
23.2
25
22
24
23
December
19.9
21
18
18
21
Average
22.5
18.3
22.0
24.1
23.0
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
10.4
11
10
11
10
11
February
10.3
11
9
10
10
12
March
11.8
12
11
13
10
13
April
13.9
13
15
14
14
May
15.6
15
16
16
18
June
17.2
17
18
18
18
July
19.1
19
19
20
18
August
20.3
20
21
19
20
September
19.6
19
22
19
20
October
16.8
17
19
16
18
November
13.1
14
12
15
12
December
10.4
12
10
10
9
Average
14.4
11.3
14.6
15.7
14.7
15.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.3
6
12
1
3
0
February
6.7
20
6
0
0
3
March
6.8
10
19
2
3
6
April
1.4
0
0
0
9
May
1.6
2
1
2
2
June
0.5
1
0
1
1
July
0.3
0
1
1
1
August
0.7
4
0
1
0
September
0.7
3
1
0
0
October
0.9
1
2
2
0
November
1.9
1
2
0
1
December
4.3
3
4
12
2
Average
3.4
11.9
4.2
1.0
2.0
2.1
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
4.9
5
6
4
5
4
February
5.5
5
6
6
5
5
March
6.1
7
6
7
6
6
April
6.2
6
6
6
6
May
6.4
6
7
7
6
June
6.0
6
6
6
6
July
6.1
6
6
6
6
August
5.8
6
6
6
6
September
5.3
5
6
5
5
October
5.4
5
5
5
5
November
4.8
5
6
4
4
December
4.1
4
4
4
4
Average
5.6
5.6
5.6
5.8
5.5
5.3
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
208°
176°
205°
196°
207°
February
187°
205°
214°
205°
197°
March
194°
205°
207°
209°
204°
April
210°
215°
208°
202°
May
207°
203°
203°
209°
June
206°
207°
211°
204°
July
208°
209°
211°
212°
August
215°
213°
215°
212°
September
209°
213°
214°
213°
October
199°
211°
215°
211°
November
197°
193°
210°
219°
December
196°
211°
211°
201°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.