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
87.9
84
82
95
91
75
February
87.2
94
76
98
86
91
March
93.2
95
92
97
100
82
April
86.2
25
100
95
94
May
95.1
85
98
90
98
June
98.3
98
100
99
99
July
99.1
100
100
100
100
August
98.6
100
96
99
100
September
97.6
100
99
99
96
October
93.9
94
95
98
92
November
93.1
93
86
96
95
December
89.0
90
82
92
95
Average
93.3
91.2
86.2
95.9
95.6
93.3
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
15.5
12
17
16
15
20
February
17.9
21
18
18
12
20
March
22.6
22
21
23
23
24
April
25.2
24
27
24
25
May
29.7
29
32
26
30
June
34.2
35
36
33
34
July
36.6
38
38
35
36
August
36.5
40
38
35
38
September
32.6
35
32
34
30
October
26.5
27
26
29
26
November
20.7
20
17
22
23
December
17.4
17
16
21
17
Average
25.4
18.2
26.7
27.1
25.8
27.0
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
3.8
0
6
2
5
7
February
5.8
9
5
3
2
5
March
10.9
12
10
8
11
14
April
12.4
13
5
14
14
May
16.1
17
0
19
19
June
18.5
23
0
20
22
July
22.0
24
8
24
26
August
22.5
27
6
24
25
September
18.2
20
1
21
20
October
12.9
16
1
16
14
November
8.9
10
7
10
11
December
4.7
3
7
2
5
Average
12.3
6.9
14.5
3.8
14.0
15.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
6
13
1
5
7
February
5.6
3
13
5
5
8
March
3.3
6
3
3
3
6
April
2.4
3
1
3
4
May
3.8
4
1
10
6
June
1.6
2
1
1
1
July
0.7
1
0
1
1
August
1.9
0
6
1
0
September
2.7
2
1
1
4
October
6.3
7
6
3
4
November
4.2
3
11
4
1
December
4.4
5
3
0
7
Average
3.5
4.9
4.3
3.0
3.1
3.8
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
9.6
8
11
9
9
9
February
10.3
10
10
10
11
11
March
10.7
10
11
11
12
9
April
11.4
11
14
11
10
May
9.8
7
12
9
10
June
9.1
8
10
8
10
July
8.1
8
10
7
8
August
8.0
8
9
8
8
September
7.7
8
8
7
8
October
9.5
11
9
10
9
November
9.4
10
10
9
10
December
8.7
9
8
9
9
Average
9.4
9.5
9.3
10.1
9.0
9.2
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
300°
255°
316°
316°
200°
February
228°
248°
270°
341°
305°
March
170°
192°
200°
172°
177°
April
140°
169°
147°
190°
May
140°
163°
132°
147°
June
116°
156°
161°
167°
July
146°
166°
160°
159°
August
131°
159°
160°
154°
September
150°
153°
127°
040°
October
102°
218°
188°
127°
November
114°
194°
167°
169°
December
204°
255°
188°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.