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
81.8
79
88
86
70
February
78.9
84
82
71
70
March
90.4
91
91
91
88
89
April
91.3
90
92
92
92
May
92.6
95
93
93
90
June
93.4
97
97
87
93
July
92.0
97
95
88
88
August
90.4
100
80
88
93
September
92.4
96
95
86
87
October
90.3
95
96
92
89
November
85.5
80
84
89
86
December
82.7
83
79
85
90
Average
89.4
90.9
91.6
89.8
87.2
86.8
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
16.6
17
15
15
16
February
17.4
20
18
13
18
March
22.2
21
23
22
22
25
April
24.8
24
25
23
24
May
27.9
28
30
27
27
June
31.3
32
33
30
31
July
32.1
34
33
31
32
August
32.3
37
30
31
32
September
30.4
34
28
28
29
October
25.9
27
25
26
26
November
19.3
20
19
17
22
December
18.1
20
18
21
16
Average
24.4
20.6
26.8
24.8
23.7
24.7
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
5.9
7
2
5
8
February
4.8
10
4
3
7
March
10.0
9
11
8
11
15
April
12.7
13
13
11
13
May
17.5
17
19
17
16
June
20.8
20
22
22
20
July
22.4
22
23
22
23
August
22.0
23
21
23
21
September
19.3
19
17
20
20
October
13.6
14
11
16
14
November
7.5
8
8
7
10
December
8.1
10
10
11
4
Average
12.9
8.9
14.8
13.1
14.0
14.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
0
0
0
12
February
2.6
0
0
0
11
March
1.0
0
0
0
0
4
April
0.5
0
1
0
1
May
0.5
0
0
0
2
June
1.2
0
1
0
1
July
1.7
0
2
0
0
August
0.6
0
1
0
0
September
0.0
0
0
0
0
October
2.0
0
0
0
0
November
0.4
0
0
0
0
December
1.7
0
0
0
0
Average
1.4
0.3
2.4
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
4.3
5
6
6
0
February
4.6
6
6
4
1
March
5.9
5
6
6
6
6
April
5.2
5
6
5
5
May
4.3
3
4
5
5
June
3.9
3
3
4
4
July
3.3
3
3
3
4
August
3.2
4
2
3
4
September
3.1
3
3
3
4
October
4.0
4
4
4
4
November
3.2
3
4
3
4
December
3.2
3
4
5
5
Average
4.2
4.6
4.0
4.3
4.3
3.9
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
229°
283°
248°
360°
February
202°
187°
195°
286°
March
147°
185°
206°
158°
183°
April
193°
171°
151°
289°
May
272°
186°
139°
178°
June
241°
295°
172°
179°
July
257°
204°
222°
220°
August
282°
201°
177°
300°
September
354°
007°
011°
007°
October
275°
199°
186°
285°
November
350°
344°
358°
002°
December
199°
202°
191°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.