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
74.6
65
72
92
84
78
February
82.0
74
95
98
85
99
March
84.5
79
75
96
95
74
April
90.6
94
88
99
89
May
96.0
94
99
100
91
June
98.2
98
96
100
97
July
99.9
100
100
100
100
August
98.3
100
99
92
100
September
94.4
96
91
99
92
October
96.4
96
99
88
100
November
87.8
95
83
91
95
December
81.0
84
61
69
91
Average
87.1
71.9
92.6
93.1
93.0
92.2
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
10.6
11
10
14
11
10
February
11.3
11
12
17
12
16
March
11.8
6
10
18
12
12
April
17.2
17
18
21
17
May
21.6
20
23
25
21
June
27.5
25
29
31
25
July
32.1
32
33
34
31
August
31.3
30
34
33
31
September
27.3
25
30
30
30
October
22.0
22
25
18
25
November
14.0
16
13
17
15
December
10.4
13
8
9
13
Average
17.6
8.9
19.7
22.1
21.0
20.1
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
4.2
4
2
5
5
4
February
3.9
4
3
6
5
7
March
4.5
1
3
7
5
4
April
8.5
8
7
10
9
May
12.4
12
12
13
13
June
16.3
14
17
19
14
July
22.2
22
21
24
22
August
20.9
21
20
22
22
September
17.1
15
19
18
19
October
13.3
13
15
9
16
November
6.9
8
5
9
7
December
4.8
6
2
4
6
Average
9.8
3.1
10.7
11.5
11.8
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
3.5
4
5
2
4
3
February
4.0
4
4
3
4
4
March
4.1
5
5
3
4
3
April
4.3
5
4
4
4
May
3.6
4
3
3
3
June
3.1
4
2
3
4
July
2.6
3
1
3
3
August
2.7
3
2
3
3
September
3.6
4
3
3
4
October
3.6
3
4
4
4
November
3.0
3
3
2
3
December
3.2
3
4
3
3
Average
3.6
3.9
3.7
2.9
3.4
3.3
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
168°
145°
079°
131°
144°
February
177°
267°
345°
306°
312°
March
173°
196°
282°
245°
193°
April
268°
259°
258°
261°
May
251°
278°
286°
247°
June
272°
227°
229°
227°
July
214°
233°
245°
249°
August
269°
235°
247°
260°
September
235°
208°
267°
264°
October
255°
286°
199°
278°
November
180°
146°
248°
233°
December
161°
176°
185°
229°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.