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
87.7
92
81
94
84
87
February
85.2
96
88
90
84
81
March
91.0
89
95
90
89
84
April
93.7
91
93
95
94
May
82.8
90
94
31
93
June
86.0
93
94
45
96
July
90.6
91
93
85
91
August
91.9
95
93
94
91
September
92.8
98
95
90
93
October
91.4
96
95
87
89
November
87.2
86
90
94
84
December
82.5
89
79
81
85
Average
89.0
92.0
91.3
92.3
78.3
89.6
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
13.4
12
16
13
13
15
February
17.6
18
20
17
15
15
March
20.5
21
21
21
21
22
April
23.6
24
24
23
22
May
26.8
26
29
22
26
June
30.2
30
32
29
30
July
31.8
32
33
31
32
August
31.6
33
31
31
32
September
29.9
30
29
28
28
October
24.6
25
24
24
25
November
17.2
19
19
18
12
December
15.0
15
16
19
14
Average
22.7
16.9
24.2
24.2
22.8
23.0
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
1.9
0
5
0
2
5
February
5.0
4
7
2
2
5
March
6.9
8
7
6
7
11
April
9.1
10
9
8
9
May
14.2
15
16
11
13
June
18.7
18
19
18
19
July
21.1
21
22
21
22
August
20.8
21
21
21
21
September
17.7
17
16
18
18
October
11.8
11
8
13
13
November
3.7
5
6
3
-1
December
3.5
2
8
7
1
Average
10.4
3.8
11.6
11.1
10.9
11.6
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
4.2
4
4
5
5
4
February
4.7
5
5
5
5
5
March
5.0
4
4
5
5
5
April
4.4
4
4
4
5
May
3.4
3
4
4
4
June
2.8
3
2
3
3
July
2.6
2
3
3
2
August
2.6
2
2
3
2
September
3.1
2
3
3
4
October
3.4
4
3
3
3
November
3.7
4
3
4
4
December
3.8
4
3
4
4
Average
3.7
4.4
3.1
3.3
3.7
3.6
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
285°
254°
324°
259°
313°
February
258°
235°
269°
315°
268°
March
343°
259°
249°
245°
227°
April
335°
234°
239°
301°
May
313°
216°
223°
252°
June
250°
360°
207°
214°
July
283°
212°
217°
226°
August
308°
226°
290°
220°
September
010°
020°
004°
039°
October
293°
343°
251°
292°
November
357°
341°
359°
333°
December
289°
242°
216°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.