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
79.3
69
74
92
79
64
February
74.5
93
77
80
68
73
March
85.3
83
85
93
85
73
April
85.8
84
78
93
84
83
May
86.2
71
89
85
90
June
92.9
94
97
91
93
July
94.1
99
98
89
91
August
93.8
99
85
93
96
September
89.6
92
99
92
82
October
87.1
84
98
93
82
November
84.3
79
79
90
87
December
82.8
92
69
85
82
Average
86.1
82.5
85.8
90.3
86.0
83.7
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
14.5
13
15
15
14
16
February
16.8
19
19
15
12
16
March
21.4
21
22
21
21
22
April
24.0
25
23
25
23
23
May
28.1
28
30
26
28
June
31.8
32
34
31
31
July
33.5
35
36
31
33
August
33.7
38
32
32
34
September
30.8
33
32
31
28
October
25.6
26
27
27
24
November
19.4
20
18
20
22
December
16.6
17
17
21
16
Average
24.1
19.4
25.8
25.4
23.8
24.3
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
5.2
2
7
4
6
7
February
7.1
9
8
4
3
6
March
11.2
12
12
9
11
14
April
13.8
16
13
15
13
14
May
18.4
18
20
18
18
June
22.0
22
22
22
22
July
23.2
24
24
21
24
August
23.0
25
20
23
23
September
20.9
22
20
21
20
October
15.4
18
15
17
14
November
9.5
12
8
9
11
December
7.7
6
11
13
6
Average
14.2
9.6
15.6
14.4
14.5
14.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.4
0
13
5
8
9
February
7.0
0
9
5
6
10
March
3.9
0
5
3
5
8
April
3.4
0
6
2
7
5
May
3.1
2
1
6
4
June
2.3
3
1
3
3
July
1.9
0
1
5
3
August
3.3
0
6
3
1
September
4.0
3
2
2
8
October
4.8
9
2
2
4
November
3.8
3
6
3
3
December
7.3
0
17
1
13
Average
3.8
3.8
3.5
4.3
5.6
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
6.2
6
7
6
6
6
February
6.1
6
6
6
4
7
March
6.4
6
7
7
6
6
April
6.3
7
6
7
4
5
May
5.4
4
6
4
6
June
5.0
4
5
3
6
July
4.3
5
5
2
4
August
4.0
5
4
2
4
September
4.3
5
4
3
5
October
5.4
6
6
5
5
November
5.2
5
4
5
5
December
5.6
5
5
6
6
Average
5.4
6.2
5.3
5.6
4.3
5.3
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
315°
226°
274°
282°
169°
February
230°
220°
283°
201°
239°
March
168°
177°
221°
162°
155°
April
192°
166°
178°
161°
129°
May
140°
182°
143°
154°
June
190°
188°
183°
168°
July
210°
207°
188°
181°
August
200°
197°
145°
171°
September
136°
084°
118°
027°
October
169°
161°
226°
093°
November
170°
113°
169°
114°
December
241°
196°
186°
222°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.