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
77.1
72
82
93
69
65
February
75.0
91
75
82
71
78
March
86.9
84
92
95
87
67
April
87.6
87
94
90
89
75
May
85.8
86
90
59
93
June
78.5
96
92
0
97
July
87.6
97
99
33
94
August
93.9
100
87
90
99
September
92.5
97
99
94
86
October
79.8
88
91
90
60
November
83.6
91
83
92
71
December
76.2
95
73
89
59
Average
84.3
83.5
91.3
90.4
70.8
79.8
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
14.1
12
16
15
12
15
February
16.2
20
18
15
11
15
March
21.1
22
22
21
21
22
April
23.6
25
23
26
22
22
May
27.7
27
30
25
27
June
31.3
30
34
31
31
July
30.6
34
37
32
32
August
33.4
38
34
32
33
September
30.6
33
31
31
27
October
21.5
25
25
4
23
November
18.5
19
17
19
21
December
16.2
16
16
21
15
Average
23.3
19.5
25.0
25.4
21.7
23.6
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
1
6
2
3
6
February
5.6
8
7
2
1
5
March
9.8
11
11
7
9
13
April
12.5
14
12
14
11
13
May
15.8
19
19
16
17
June
20.9
26
22
22
21
July
19.8
24
25
22
23
August
21.1
25
22
23
21
September
19.3
21
19
17
19
October
11.2
14
12
1
12
November
7.2
9
7
6
8
December
5.8
5
10
11
4
Average
12.3
8.6
14.6
13.5
11.8
13.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.7
11
11
5
10
9
February
8.9
4
8
6
7
16
March
5.8
8
2
5
5
13
April
5.4
8
9
3
10
7
May
4.6
7
2
10
5
June
2.2
4
1
0
3
July
1.6
3
2
0
3
August
3.1
0
6
5
1
September
2.8
2
1
1
8
October
5.3
5
6
1
4
November
4.7
4
10
5
1
December
6.4
3
8
2
13
Average
5.0
7.7
4.4
4.1
4.5
6.6
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
5.1
5
6
6
4
5
February
5.5
6
5
5
6
6
March
5.9
5
7
6
6
6
April
5.8
6
5
7
5
5
May
5.4
4
6
5
6
June
4.7
1
5
4
5
July
3.9
2
5
4
4
August
4.0
4
4
4
4
September
3.9
4
3
4
5
October
4.6
5
4
5
4
November
4.2
4
1
5
4
December
4.8
4
5
6
5
Average
4.9
5.4
4.4
4.9
4.8
4.8
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
215°
212°
284°
278°
141°
February
197°
206°
258°
283°
222°
March
153°
153°
190°
154°
147°
April
155°
102°
152°
132°
134°
May
128°
157°
119°
127°
June
087°
134°
152°
159°
July
188°
176°
170°
160°
August
123°
140°
157°
109°
September
111°
074°
094°
023°
October
113°
148°
206°
090°
November
145°
045°
147°
121°
December
210°
177°
177°
199°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.