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
90
76
94
89
87
February
87.4
95
93
94
75
80
March
91.0
87
89
86
91
84
April
92.9
88
91
96
93
May
92.6
90
91
97
91
June
93.0
90
95
92
96
July
93.2
91
92
93
96
August
92.2
95
88
90
91
September
93.5
94
92
90
91
October
92.0
92
94
91
93
November
88.3
91
85
99
88
December
83.3
91
70
76
89
Average
90.9
90.4
90.0
90.0
90.4
90.3
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
15.9
15
18
16
15
17
February
19.3
18
22
20
17
17
March
22.0
21
22
23
23
24
April
25.2
25
25
25
25
May
29.2
27
30
29
28
June
32.1
31
35
32
32
July
33.5
34
33
33
35
August
32.8
34
32
32
34
September
31.1
30
30
30
29
October
26.5
26
26
26
27
November
20.1
20
21
20
23
December
17.0
17
17
20
16
Average
24.6
18.1
25.5
25.8
25.1
25.5
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
4.0
2
6
3
4
6
February
7.2
5
10
5
5
7
March
8.8
9
9
9
9
12
April
11.1
12
10
10
11
May
15.9
16
16
14
15
June
19.8
19
19
20
20
July
22.1
23
23
22
22
August
21.5
22
22
20
22
September
18.2
18
17
16
19
October
13.3
11
10
15
15
November
7.0
7
9
4
10
December
5.6
5
8
8
2
Average
12.1
5.5
13.0
12.7
12.3
13.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
4
7
4
9
7
February
6.9
8
4
6
10
16
March
5.3
9
5
6
4
9
April
4.0
5
3
2
7
May
3.4
3
3
2
2
June
3.3
4
1
4
3
July
2.3
2
3
3
2
August
2.7
4
3
3
3
September
2.6
2
2
4
5
October
3.2
2
0
4
1
November
3.9
3
4
0
3
December
5.7
3
1
3
7
Average
4.3
7.2
3.5
2.9
3.8
5.1
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
6.9
8
6
7
7
7
February
7.0
7
8
7
7
7
March
7.3
7
6
8
7
7
April
6.7
7
7
6
7
May
6.0
7
6
6
6
June
5.5
6
5
6
6
July
4.8
5
5
4
5
August
4.7
5
4
5
5
September
5.7
5
6
5
7
October
5.9
6
5
5
6
November
6.0
6
7
6
6
December
6.2
6
6
5
6
Average
6.2
7.2
6.0
6.0
5.6
6.1
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
280°
260°
306°
278°
322°
February
210°
252°
265°
330°
268°
March
333°
257°
241°
067°
233°
April
204°
244°
265°
287°
May
026°
236°
202°
305°
June
265°
018°
190°
283°
July
265°
238°
244°
230°
August
288°
323°
139°
208°
September
053°
035°
045°
051°
October
354°
001°
315°
048°
November
027°
026°
355°
033°
December
311°
046°
246°
294°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.