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
86.8
82
86
96
88
75
February
83.3
91
86
87
75
85
March
90.7
94
89
95
97
77
April
93.9
96
97
94
89
May
93.9
97
93
85
94
June
96.5
94
100
93
97
July
98.5
100
100
98
98
August
97.9
100
95
98
100
September
94.4
98
100
98
88
October
89.6
90
94
94
84
November
88.4
87
81
93
93
December
85.6
90
75
84
85
Average
91.6
89.3
93.0
93.8
91.8
88.7
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
14.4
12
17
15
14
16
February
16.1
20
17
15
10
15
March
21.6
22
21
22
22
22
April
24.2
24
26
23
24
May
29.0
29
31
26
29
June
33.1
34
35
32
33
July
35.6
37
39
34
35
August
35.1
39
35
34
36
September
31.9
34
32
33
29
October
25.8
26
27
28
25
November
19.7
20
18
20
22
December
16.4
17
16
22
16
Average
24.4
17.9
26.3
26.2
24.8
25.1
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
4.5
2
7
3
6
7
February
6.2
10
7
2
2
6
March
11.6
12
11
9
13
14
April
14.2
13
16
14
14
May
19.8
20
20
19
19
June
24.1
24
25
24
24
July
26.2
27
28
25
27
August
25.7
29
25
26
26
September
22.7
24
22
22
21
October
15.7
16
15
18
15
November
9.7
10
9
10
13
December
7.3
7
8
13
6
Average
14.7
7.7
16.2
15.4
16.0
15.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.9
7
5
0
10
8
February
6.2
3
6
7
4
11
March
4.4
5
5
3
2
9
April
2.1
2
1
4
3
May
3.3
3
1
10
5
June
1.2
1
1
2
1
July
0.7
0
0
2
3
August
1.9
0
3
3
1
September
1.9
0
1
0
4
October
5.7
5
7
0
5
November
3.0
2
8
2
0
December
5.6
6
3
2
11
Average
3.5
4.7
2.7
2.7
3.4
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
8.5
8
9
9
8
8
February
9.1
9
8
9
9
10
March
9.6
9
10
10
10
9
April
10.2
9
12
10
9
May
9.3
7
11
8
11
June
8.6
8
10
7
8
July
7.8
7
8
9
8
August
7.4
8
7
8
8
September
7.0
7
7
7
7
October
8.2
9
7
9
9
November
7.9
7
8
8
8
December
7.9
7
7
9
8
Average
8.5
8.8
8.0
8.7
8.4
8.5
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°
243°
327°
303°
157°
February
209°
241°
293°
357°
290°
March
158°
171°
203°
166°
150°
April
114°
158°
136°
154°
May
135°
162°
122°
137°
June
133°
159°
158°
163°
July
170°
165°
172°
156°
August
144°
142°
159°
147°
September
141°
134°
133°
059°
October
140°
149°
186°
106°
November
147°
132°
160°
156°
December
205°
181°
178°
281°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.