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
85.1
98
99
100
100
0
February
76.6
99
99
100
0
March
80.8
98
100
100
100
0
April
90.8
100
99
70
0
May
78.7
100
100
100
June
78.1
100
99
100
July
73.9
100
100
98
August
75.7
99
99
77
September
73.7
100
100
87
October
98.0
100
99
100
November
86.2
100
100
100
December
79.3
99
94
100
100
Average
76.0
98.2
99.4
99.1
96.4
10.6
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
15.0
17
17
20
18
0
February
15.3
19
22
22
0
March
18.6
25
22
26
23
0
April
27.7
30
32
32
0
May
26.5
34
35
34
June
31.0
38
40
40
July
31.5
43
42
38
August
30.0
41
37
29
September
27.9
38
37
28
October
29.3
33
29
29
November
20.3
26
21
27
December
15.1
21
16
20
17
Average
21.1
19.1
29.9
28.6
28.0
3.5
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
4.9
4
5
6
6
0
February
4.6
5
6
8
0
March
6.8
11
7
9
9
0
April
11.5
11
13
12
0
May
13.8
17
18
20
June
18.3
19
24
27
July
21.8
28
31
27
August
20.1
26
26
20
September
18.1
23
31
17
October
16.0
17
17
15
November
8.4
12
7
13
December
5.4
7
6
8
6
Average
10.5
6.2
14.8
14.2
15.2
1.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.8
3
7
0
1
0
February
2.0
3
2
0
0
March
1.7
9
2
0
1
0
April
0.8
1
0
3
0
May
1.1
1
2
0
June
0.5
0
1
0
July
0.9
0
0
4
August
0.6
1
1
1
September
0.8
1
0
0
October
1.4
0
0
0
November
1.5
0
1
9
December
2.5
4
7
1
0
Average
1.5
4.4
1.5
1.0
1.8
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
4.4
4
5
6
7
0
February
4.9
7
7
7
0
March
5.4
7
5
7
8
0
April
6.0
6
7
8
0
May
5.3
6
7
7
June
4.8
6
6
7
July
4.7
6
6
6
August
4.0
6
4
4
September
4.4
6
4
5
October
6.3
6
6
6
November
4.7
6
5
5
December
3.5
5
3
4
7
Average
4.4
4.9
5.9
6.1
6.1
0.7
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
241°
203°
061°
053°
360°
February
179°
046°
274°
360°
March
235°
240°
255°
228°
360°
April
258°
251°
073°
360°
May
214°
231°
237°
June
231°
227°
246°
July
253°
256°
229°
August
205°
169°
204°
September
244°
143°
224°
October
071°
080°
252°
November
059°
029°
060°
December
064°
288°
295°
335°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.