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
92.0
81
86
98
98
94
February
93.7
84
96
97
98
97
March
92.0
88
80
94
99
95
April
91.3
77
95
92
91
May
91.8
81
95
95
89
June
87.6
92
84
87
89
July
87.8
81
91
88
86
August
89.4
85
93
89
90
September
92.0
91
94
92
91
October
95.0
91
88
96
97
November
93.4
85
95
88
96
December
96.2
94
92
93
100
Average
91.1
84.5
86.2
92.8
92.6
92.6
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
19.6
18
16
20
20
20
February
19.4
16
17
21
21
21
March
19.7
17
16
21
20
19
April
22.3
18
22
22
22
May
21.9
19
21
22
25
June
24.7
21
26
24
25
July
28.0
27
26
27
27
August
28.6
27
28
27
30
September
27.9
24
29
26
31
October
26.4
25
24
23
28
November
23.5
23
21
23
23
December
20.1
20
16
17
21
Average
22.8
16.9
21.1
23.0
22.5
24.3
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
8.2
7
7
7
8
8
February
8.0
8
5
6
8
8
March
9.0
7
6
8
8
10
April
11.5
9
11
11
13
May
13.3
12
12
13
15
June
15.4
13
14
15
15
July
18.0
16
17
18
17
August
18.2
16
18
16
19
September
17.0
16
18
15
16
October
13.7
12
15
12
13
November
10.2
9
8
10
9
December
8.0
8
6
8
7
Average
11.9
7.1
10.6
11.7
11.6
12.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.4
8
18
2
5
1
February
6.4
16
7
4
0
2
March
6.5
7
19
4
3
8
April
1.6
1
2
1
5
May
1.9
1
0
2
0
June
0.7
1
0
1
1
July
0.1
0
0
0
0
August
0.6
3
0
1
0
September
1.5
3
5
2
0
October
0.5
1
0
2
1
November
2.1
1
5
0
1
December
3.7
2
9
8
1
Average
3.4
10.1
4.6
2.2
2.0
1.5
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
5.6
5
7
4
6
5
February
6.2
6
7
7
6
6
March
6.2
7
7
6
7
6
April
6.1
5
6
6
6
May
6.0
5
6
6
6
June
5.5
5
5
6
6
July
5.3
5
5
6
6
August
5.6
5
6
6
6
September
5.6
5
6
6
6
October
5.7
6
5
6
5
November
5.7
6
7
5
6
December
5.3
5
5
6
5
Average
5.8
5.9
5.7
5.8
5.9
5.7
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
277°
227°
288°
292°
294°
February
251°
266°
286°
298°
284°
March
254°
241°
256°
261°
264°
April
275°
272°
275°
240°
May
264°
241°
246°
274°
June
282°
258°
267°
265°
July
282°
271°
279°
288°
August
287°
282°
283°
279°
September
283°
283°
293°
298°
October
289°
275°
276°
275°
November
290°
259°
309°
290°
December
287°
280°
261°
309°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.