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
88.3
93
80
93
87
84
February
86.4
94
94
93
73
83
March
91.2
87
94
88
95
84
April
93.2
91
96
95
93
May
94.2
93
93
96
91
June
94.2
95
96
90
98
July
93.5
93
91
92
96
August
92.0
95
92
89
91
September
93.6
97
93
92
89
October
89.5
91
93
90
91
November
89.8
89
87
99
84
December
82.4
90
73
76
87
Average
91.1
91.4
92.0
91.5
89.7
89.7
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
15.6
15
17
15
15
17
February
18.5
18
21
19
16
17
March
22.0
21
22
23
23
23
April
24.6
25
25
24
24
May
28.7
27
30
28
28
June
31.6
30
34
31
31
July
32.7
33
33
31
33
August
32.1
33
31
31
32
September
30.0
29
29
29
29
October
25.9
25
25
26
27
November
19.9
20
21
19
23
December
17.1
17
18
20
15
Average
24.0
18.2
24.8
25.3
24.4
25.0
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
4.1
3
5
3
4
7
February
6.7
6
9
6
5
7
March
9.5
10
9
9
10
13
April
11.2
12
10
10
12
May
16.0
16
17
14
15
June
20.3
19
21
20
20
July
22.2
23
23
22
22
August
22.2
22
22
22
22
September
18.6
18
18
18
19
October
13.5
12
10
15
16
November
7.5
7
10
5
11
December
6.0
5
8
8
3
Average
12.2
6.1
13.1
13.1
12.9
13.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.5
4
8
5
13
8
February
7.3
6
4
6
15
10
March
5.8
9
4
7
5
8
April
3.2
4
2
4
3
May
2.2
4
2
2
3
June
2.7
2
1
5
2
July
2.0
3
3
3
1
August
3.5
4
4
5
3
September
3.5
3
3
6
6
October
4.2
7
1
3
2
November
5.4
9
6
0
7
December
7.7
7
2
6
8
Average
4.6
6.4
4.5
3.4
5.3
4.6
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
7.3
8
7
8
7
8
February
7.5
8
8
7
8
8
March
7.3
7
7
8
7
7
April
6.9
7
7
7
7
May
6.6
7
6
7
7
June
6.2
6
6
6
6
July
5.3
5
6
5
5
August
5.0
5
5
5
5
September
6.0
6
6
5
7
October
6.1
7
6
5
7
November
6.8
7
8
6
7
December
6.7
7
6
6
7
Average
6.6
7.5
6.5
6.5
6.1
6.5
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
277°
252°
292°
268°
315°
February
258°
240°
249°
310°
256°
March
300°
235°
236°
070°
227°
April
171°
227°
246°
270°
May
010°
241°
180°
276°
June
268°
019°
186°
270°
July
268°
226°
239°
239°
August
290°
270°
126°
216°
September
047°
027°
029°
043°
October
011°
003°
302°
053°
November
016°
032°
346°
030°
December
310°
004°
232°
280°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.