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
82.7
79
82
89
80
80
February
76.4
89
88
87
62
78
March
81.7
84
84
95
89
73
April
85.6
79
87
81
78
May
88.3
88
93
81
94
June
93.6
94
98
89
92
July
95.7
99
99
87
97
August
97.2
99
97
95
98
September
91.8
98
96
93
93
October
89.1
91
96
92
89
November
81.7
83
73
87
83
December
80.4
85
63
76
89
Average
87.0
83.8
89.5
90.8
84.7
87.2
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
15.8
14
18
15
16
17
February
17.6
20
18
16
14
17
March
22.1
22
23
23
22
23
April
24.9
24
27
25
25
May
28.4
28
32
26
29
June
31.9
33
35
31
31
July
33.1
35
35
30
34
August
32.4
37
33
31
35
September
30.5
34
31
31
28
October
25.4
26
26
27
26
November
19.5
19
18
20
22
December
17.3
18
17
21
18
Average
24.2
18.4
26.0
25.9
24.5
25.3
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
4.1
2
7
2
4
7
February
6.1
8
6
2
3
5
March
10.5
11
12
7
9
14
April
12.9
13
15
13
13
May
17.6
17
20
17
17
June
20.6
21
21
21
19
July
20.2
22
22
21
22
August
20.3
22
22
22
21
September
19.1
21
19
18
18
October
13.2
15
13
15
13
November
8.3
9
9
8
9
December
5.7
6
10
10
3
Average
12.5
7.1
14.3
13.5
13.4
13.3
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
5.7
7
6
6
6
4
February
6.4
8
7
7
7
5
March
7.3
7
7
8
8
6
April
7.2
7
8
7
6
May
6.5
5
8
7
7
June
6.1
6
7
6
6
July
5.5
5
6
6
6
August
5.7
6
5
6
6
September
4.7
4
4
5
7
October
5.4
3
6
6
6
November
5.6
6
6
6
6
December
5.3
5
5
6
6
Average
6.1
7.0
5.4
6.4
6.2
5.9
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
332°
278°
339°
329°
199°
February
239°
251°
354°
047°
338°
March
170°
161°
194°
149°
150°
April
124°
154°
126°
131°
May
155°
169°
133°
156°
June
174°
164°
155°
152°
July
174°
171°
158°
164°
August
158°
162°
166°
163°
September
166°
149°
127°
038°
October
069°
166°
165°
137°
November
345°
111°
165°
149°
December
199°
183°
192°
244°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.