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
85.2
84
80
91
86
81
February
78.8
92
85
86
74
82
March
86.9
88
84
92
86
82
April
89.2
91
85
92
88
86
May
90.2
86
95
89
94
June
93.9
97
97
92
94
July
92.7
94
98
92
91
August
91.6
98
98
93
97
September
94.0
99
98
95
90
October
90.0
97
95
89
88
November
85.3
83
81
90
84
December
84.4
89
78
80
87
Average
88.7
88.6
89.9
92.5
88.1
88.2
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
17.8
16
19
18
18
19
February
19.3
21
21
17
15
19
March
23.6
24
24
23
24
24
April
26.0
27
25
28
25
26
May
29.8
29
33
28
29
June
33.0
34
35
32
32
July
34.7
36
37
32
33
August
35.2
39
34
33
35
September
31.6
36
33
32
30
October
27.5
28
28
29
27
November
20.9
21
21
22
25
December
18.6
20
21
24
18
Average
26.0
21.8
27.5
27.3
25.9
26.6
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
6.0
2
9
5
7
8
February
8.0
6
9
4
5
7
March
11.2
5
10
9
12
15
April
14.0
12
11
17
14
14
May
18.1
9
21
20
19
June
20.6
10
22
23
21
July
20.7
8
24
23
24
August
20.7
15
23
24
23
September
17.2
14
20
20
21
October
14.8
11
14
17
15
November
8.3
5
12
10
13
December
7.6
5
13
14
6
Average
13.2
6.3
9.6
15.3
15.7
15.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.2
8
6
5
5
12
February
7.0
4
4
8
7
10
March
4.9
5
7
4
6
7
April
2.9
3
5
0
6
5
May
2.6
4
0
9
1
June
3.2
1
0
5
5
July
2.2
1
0
8
3
August
3.1
0
4
2
1
September
3.2
1
1
1
8
October
3.1
4
3
2
2
November
6.4
6
13
6
5
December
5.1
3
3
2
7
Average
4.1
4.6
3.3
3.2
4.9
5.2
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
6.1
5
5
6
6
6
February
6.5
5
6
6
7
7
March
6.5
4
6
7
7
7
April
6.9
7
5
7
7
6
May
6.2
3
7
7
7
June
5.2
4
5
4
5
July
4.8
4
5
3
6
August
4.9
4
5
4
5
September
4.5
3
3
4
6
October
5.1
4
5
5
5
November
4.9
3
5
5
5
December
5.3
4
5
6
5
Average
5.6
5.5
4.2
5.5
5.3
5.8
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
348°
327°
334°
338°
135°
February
233°
249°
346°
018°
298°
March
142°
148°
179°
118°
152°
April
156°
111°
151°
115°
103°
May
140°
166°
135°
156°
June
181°
162°
154°
139°
July
181°
176°
162°
163°
August
159°
161°
159°
160°
September
144°
097°
089°
021°
October
082°
127°
182°
039°
November
012°
064°
059°
077°
December
050°
149°
183°
340°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.