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
86.9
83
76
95
85
92
February
86.1
92
93
91
86
78
March
90.8
89
93
93
93
82
April
93.7
93
96
94
96
May
94.0
95
94
96
95
June
92.5
89
96
93
93
July
91.2
90
93
90
93
August
92.0
95
91
89
94
September
90.3
93
93
85
90
October
87.7
90
94
82
86
November
89.9
94
90
95
90
December
83.3
82
70
82
85
Average
90.0
88.1
90.3
92.2
89.4
89.9
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
9.9
8
13
10
10
12
February
14.0
16
17
15
11
12
March
17.9
19
18
20
19
19
April
21.6
22
22
22
21
May
26.7
25
28
25
25
June
29.4
29
32
30
29
July
31.4
31
32
31
33
August
30.6
30
31
31
31
September
28.4
28
28
27
26
October
23.1
23
22
23
23
November
15.9
18
17
16
19
December
12.4
13
12
17
11
Average
21.2
14.4
22.2
22.4
21.5
21.7
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
0.1
-1
3
-2
1
3
February
2.7
2
5
0
1
3
March
5.9
7
6
5
6
9
April
8.3
10
8
7
8
May
14.8
14
15
13
13
June
18.5
17
19
19
18
July
21.3
21
23
21
22
August
20.6
21
20
22
21
September
17.3
17
15
17
18
October
10.8
10
6
13
12
November
3.4
4
5
2
5
December
2.3
2
4
5
-1
Average
9.9
2.5
10.7
10.0
10.2
10.8
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
4.1
4
4
5
4
4
February
4.5
4
5
5
4
5
March
5.1
5
6
6
5
5
April
4.8
5
5
5
5
May
3.9
4
4
4
4
June
3.5
4
4
4
4
July
2.9
3
4
3
3
August
2.8
3
3
2
3
September
3.0
3
4
2
3
October
3.5
4
4
3
3
November
3.7
4
4
4
4
December
3.6
4
3
4
3
Average
3.8
4.4
4.0
4.2
3.5
3.8
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
281°
248°
274°
294°
270°
February
257°
229°
254°
310°
255°
March
263°
266°
233°
303°
243°
April
258°
240°
264°
283°
May
272°
228°
242°
245°
June
244°
307°
213°
225°
July
230°
217°
215°
245°
August
274°
226°
227°
266°
September
325°
349°
300°
222°
October
280°
299°
244°
268°
November
303°
279°
266°
277°
December
264°
251°
224°
281°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.