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
90.0
88
94
78
88
97
February
88.0
91
91
86
87
84
March
93.8
96
89
91
97
93
April
97.5
98
95
100
97
May
98.0
99
96
99
100
June
98.8
99
98
98
99
July
99.6
100
100
99
100
August
97.4
97
99
99
98
September
93.7
98
98
98
69
October
86.5
86
76
93
87
November
86.4
87
88
89
84
December
85.3
76
84
84
88
Average
93.2
91.6
93.1
91.3
94.7
91.8
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
8.5
7
9
9
10
10
February
9.5
12
9
11
9
12
March
13.5
15
12
15
14
13
April
17.0
16
15
21
19
May
22.4
25
19
22
22
June
25.6
27
24
29
24
July
29.6
31
30
30
28
August
30.3
31
32
30
29
September
25.5
25
28
27
26
October
18.7
20
23
17
19
November
11.8
12
10
13
11
December
8.7
11
7
8
10
Average
17.6
11.1
18.9
18.9
19.1
18.4
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
3.3
3
4
3
5
6
February
2.8
5
2
3
3
3
March
4.7
6
4
6
4
4
April
7.2
7
6
7
7
May
10.9
12
10
10
11
June
13.6
13
14
15
13
July
15.9
16
17
16
15
August
16.5
18
18
17
16
September
14.0
14
15
14
15
October
9.0
10
11
9
9
November
5.6
6
4
8
5
December
3.7
6
2
3
4
Average
8.4
4.4
9.4
9.2
9.3
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.5
38
20
19
23
33
February
23.5
22
22
18
28
13
March
18.9
18
24
19
14
16
April
16.7
28
21
4
7
May
9.9
3
20
8
14
June
7.4
6
10
7
13
July
1.4
1
3
1
2
August
2.2
6
1
2
3
September
6.1
8
1
8
6
October
13.6
16
21
15
7
November
17.5
11
23
20
23
December
21.2
25
18
32
21
Average
14.2
25.6
13.4
14.0
12.4
12.5
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
8.3
10
8
6
7
10
February
7.2
7
8
6
8
6
March
6.7
6
7
5
6
7
April
6.6
7
6
6
6
May
5.4
5
6
6
6
June
5.5
5
6
6
6
July
5.3
5
5
6
5
August
5.0
5
5
5
6
September
5.3
6
5
5
6
October
5.6
6
4
7
5
November
6.8
6
7
7
6
December
7.3
7
6
7
8
Average
6.3
7.8
6.1
5.6
6.1
6.2
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
124°
125°
142°
128°
165°
February
135°
154°
129°
183°
214°
March
196°
156°
218°
210°
191°
April
188°
220°
333°
255°
May
302°
242°
286°
232°
June
311°
282°
294°
280°
July
307°
306°
311°
308°
August
310°
298°
309°
307°
September
281°
315°
281°
107°
October
157°
253°
157°
243°
November
184°
130°
167°
191°
December
131°
128°
176°
145°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.