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
84.1
85
79
90
87
72
February
82.3
95
86
89
73
77
March
88.5
84
89
88
90
77
April
91.3
86
95
97
91
May
91.5
87
92
95
90
June
83.1
92
97
89
89
July
86.9
97
93
89
52
August
90.0
93
88
88
88
September
91.8
93
92
89
85
October
87.9
92
92
80
85
November
85.6
91
87
96
85
December
80.0
87
72
80
85
Average
87.2
87.5
89.6
90.3
88.1
81.1
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
12.1
12
15
12
12
13
February
17.0
17
19
17
14
14
March
19.6
19
20
20
20
20
April
21.8
22
22
22
18
May
26.5
24
27
26
25
June
29.2
28
31
29
28
July
31.0
31
31
30
31
August
30.1
32
30
30
30
September
27.2
28
27
27
26
October
23.0
23
22
23
23
November
16.1
17
18
17
20
December
14.0
14
14
17
13
Average
21.6
15.8
22.7
22.8
22.0
21.8
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
2.8
2
4
1
3
5
February
6.6
5
8
5
4
5
March
8.0
9
6
7
9
11
April
9.0
7
9
10
7
May
12.4
8
14
13
13
June
16.6
10
18
19
19
July
17.3
13
12
17
21
August
19.7
21
17
21
20
September
15.5
17
16
17
18
October
11.0
11
9
13
14
November
6.0
6
8
4
9
December
4.7
4
7
6
2
Average
10.1
5.1
9.5
10.2
11.4
11.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
5.2
5
5
5
5
5
February
5.2
5
5
5
5
5
March
5.4
5
5
6
4
5
April
5.1
5
5
4
6
May
4.3
4
4
4
5
June
3.6
4
3
3
4
July
3.0
3
3
3
3
August
2.9
3
2
2
3
September
3.1
3
3
2
4
October
3.7
4
4
3
3
November
4.0
4
4
4
4
December
4.6
5
4
4
5
Average
4.2
5.1
4.0
4.0
3.5
4.1
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
288°
265°
288°
282°
312°
February
269°
247°
274°
323°
272°
March
291°
245°
253°
132°
236°
April
290°
243°
275°
288°
May
342°
239°
232°
266°
June
282°
300°
215°
264°
July
287°
251°
251°
254°
August
292°
227°
201°
221°
September
001°
024°
305°
045°
October
299°
318°
275°
023°
November
355°
352°
319°
347°
December
277°
264°
243°
292°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.