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
89.4
98
52
94
94
93
February
84.1
100
23
85
82
92
March
93.0
100
79
88
100
92
April
98.8
99
99
100
99
98
May
98.7
98
97
99
99
June
98.8
99
97
97
100
July
99.6
100
100
99
100
August
98.3
99
95
99
100
September
95.7
96
97
100
97
October
93.4
87
91
98
96
November
86.0
80
47
95
99
December
88.5
96
44
100
88
Average
94.4
99.0
84.2
88.6
97.0
96.0
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
16.9
17
18
17
15
17
February
19.8
23
20
18
16
18
March
24.4
26
25
24
24
24
April
28.6
33
28
30
25
28
May
32.2
31
35
31
33
June
35.7
38
36
35
35
July
35.4
38
37
33
37
August
34.8
38
33
33
37
September
31.3
35
31
33
30
October
26.6
28
25
29
29
November
21.4
21
18
23
24
December
18.1
19
19
24
17
Average
26.4
21.4
27.6
27.3
26.7
27.4
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
3.1
3
5
2
2
5
February
4.7
8
5
1
3
4
March
9.3
11
9
8
8
11
April
12.7
19
12
14
12
13
May
17.3
17
18
17
18
June
21.3
23
22
20
21
July
22.6
25
24
21
23
August
22.0
25
22
21
23
September
18.9
21
18
19
16
October
13.2
15
12
15
12
November
7.9
9
6
9
9
December
5.1
6
8
9
3
Average
12.4
6.9
13.8
13.2
13.0
13.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.7
1
1
2
3
2
February
2.7
2
5
3
5
5
March
0.8
0
0
0
1
4
April
0.7
0
0
0
2
0
May
1.0
2
0
1
2
June
0.6
1
1
1
1
July
1.2
0
1
0
3
August
1.4
0
3
4
0
September
3.4
1
5
1
2
October
2.6
4
3
0
3
November
3.8
11
6
4
0
December
2.7
0
1
0
6
Average
1.8
1.2
2.0
1.9
1.6
2.3
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
8.9
8
10
8
9
10
February
9.6
10
9
9
9
9
March
10.4
11
10
11
12
9
April
10.3
8
10
11
10
10
May
10.1
9
10
11
10
June
9.7
8
11
9
11
July
9.0
10
9
8
9
August
8.2
7
9
8
9
September
8.1
8
8
8
7
October
8.1
8
8
8
8
November
8.1
7
9
8
8
December
8.4
9
8
8
9
Average
9.1
9.2
8.8
9.4
9.0
9.0
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
264°
253°
300°
265°
261°
February
274°
254°
267°
339°
289°
March
254°
248°
274°
209°
190°
April
244°
245°
204°
185°
249°
May
153°
198°
139°
161°
June
194°
144°
132°
151°
July
137°
139°
129°
135°
August
133°
122°
147°
134°
September
145°
139°
137°
107°
October
130°
146°
210°
172°
November
322°
239°
297°
166°
December
233°
247°
258°
273°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.