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
88.1
79
98
96
84
85
February
84.8
90
95
92
75
83
March
91.0
91
88
98
94
85
April
90.1
87
91
97
83
86
May
91.9
97
94
81
95
June
96.4
97
100
92
99
July
89.3
66
81
82
98
August
96.0
99
98
86
100
September
93.4
94
100
99
86
October
90.0
92
97
93
89
November
88.9
88
88
95
93
December
86.4
92
83
93
89
Average
90.3
86.5
90.8
93.9
88.0
90.8
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
15.8
13
18
17
15
18
February
17.8
21
19
16
13
17
March
22.4
21
23
24
22
23
April
25.4
25
25
29
24
25
May
29.6
28
34
28
30
June
34.0
36
36
33
33
July
36.7
39
39
34
37
August
36.1
40
36
35
38
September
32.5
35
33
35
29
October
26.6
27
27
30
26
November
20.5
20
18
22
23
December
18.0
18
18
25
17
Average
25.5
19.9
27.0
27.4
26.4
26.2
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
3.6
2
6
1
4
6
February
5.1
8
6
1
1
4
March
10.0
11
9
8
9
13
April
12.8
14
13
15
12
12
May
18.0
18
20
17
17
June
20.5
22
15
22
21
July
21.0
24
9
22
23
August
22.1
23
19
23
23
September
20.1
23
18
20
19
October
13.7
15
13
16
12
November
8.3
9
8
8
10
December
6.0
6
9
11
4
Average
12.8
8.4
14.4
11.4
13.7
13.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.0
8
4
3
8
4
February
3.1
4
3
2
3
5
March
3.0
5
3
1
4
6
April
2.9
4
5
1
6
2
May
3.1
4
1
6
4
June
0.9
1
0
2
1
July
1.2
2
0
3
2
August
1.7
0
3
1
1
September
2.9
4
1
1
4
October
4.2
3
4
1
1
November
3.2
5
7
2
3
December
4.9
5
7
3
7
Average
3.1
5.1
3.0
2.0
3.1
3.3
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
9.7
7
11
9
10
10
February
10.4
9
11
11
10
11
March
10.6
8
11
12
12
9
April
10.8
8
10
14
10
10
May
9.5
6
13
9
10
June
8.2
7
9
7
9
July
7.2
7
8
7
8
August
7.7
8
8
8
8
September
7.2
8
6
7
8
October
9.1
10
9
9
9
November
8.6
6
8
9
9
December
8.9
8
9
9
10
Average
8.9
8.1
8.6
9.7
8.9
9.1
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
283°
261°
297°
310°
227°
February
259°
254°
306°
310°
300°
March
206°
196°
222°
194°
180°
April
183°
132°
179°
147°
204°
May
146°
175°
138°
158°
June
175°
171°
165°
170°
July
181°
185°
169°
167°
August
158°
157°
174°
178°
September
161°
153°
141°
039°
October
143°
180°
205°
154°
November
206°
186°
196°
181°
December
234°
200°
206°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.