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
89.9
84
93
95
89
83
February
86.9
93
85
93
81
95
March
92.2
92
89
98
99
80
April
95.5
98
99
94
92
May
95.8
98
97
86
97
June
98.1
96
100
99
99
July
99.6
99
100
99
99
August
98.1
100
96
98
100
September
96.7
100
99
99
95
October
93.1
94
95
98
88
November
91.2
90
82
94
94
December
87.4
89
76
94
91
Average
93.5
89.6
94.4
94.9
94.4
93.0
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
14.5
12
17
15
14
16
February
16.8
20
17
15
11
16
March
21.8
22
21
22
22
22
April
24.5
24
27
23
24
May
29.2
29
32
26
29
June
33.6
34
35
32
34
July
36.2
38
39
34
35
August
35.7
40
36
34
36
September
32.2
35
32
33
29
October
26.1
26
27
28
25
November
19.8
19
18
20
22
December
16.6
17
16
22
16
Average
24.7
17.6
26.5
26.4
25.0
25.5
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
2.9
1
5
0
4
6
February
4.8
9
5
1
1
5
March
9.9
11
10
8
10
13
April
12.8
13
15
13
13
May
18.4
19
19
18
17
June
22.9
24
25
23
21
July
25.3
26
28
24
26
August
25.0
28
25
24
25
September
21.3
24
21
21
19
October
14.1
15
14
16
13
November
8.2
9
8
8
10
December
5.7
6
8
10
4
Average
13.4
6.7
15.4
14.4
14.4
14.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.5
6
6
1
11
8
February
8.2
6
12
8
7
9
March
4.2
3
3
4
3
11
April
3.4
2
2
6
4
May
4.6
3
1
13
7
June
1.4
1
1
2
1
July
1.3
1
0
3
3
August
2.1
0
4
1
1
September
3.0
1
1
1
2
October
6.8
6
8
3
6
November
5.7
8
13
5
2
December
6.8
8
6
1
8
Average
4.4
4.9
4.0
3.8
4.4
4.9
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
9.9
10
11
10
10
10
February
10.5
11
11
11
11
11
March
11.1
11
12
12
12
10
April
11.6
11
15
12
11
May
10.4
8
14
9
11
June
9.5
9
10
9
10
July
8.3
9
9
8
9
August
8.2
9
8
9
8
September
8.0
9
7
8
9
October
9.7
11
9
10
10
November
9.5
9
9
10
10
December
9.3
9
9
10
10
Average
9.8
10.5
9.6
10.3
9.7
9.8
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
310°
251°
306°
310°
195°
February
227°
240°
303°
344°
287°
March
165°
184°
205°
177°
170°
April
115°
169°
146°
183°
May
144°
167°
135°
149°
June
140°
152°
160°
169°
July
173°
165°
160°
163°
August
149°
139°
163°
147°
September
150°
142°
139°
056°
October
151°
151°
189°
125°
November
167°
156°
175°
170°
December
205°
200°
189°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.