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
83.3
81
76
92
85
80
February
76.6
91
73
82
69
68
March
82.1
86
66
93
70
80
April
86.8
79
93
87
89
May
85.4
57
97
94
96
June
83.1
46
93
84
97
July
74.5
26
91
47
94
August
80.7
73
91
53
94
September
79.3
88
91
69
90
October
67.8
84
49
41
41
November
78.1
75
67
57
79
December
81.7
88
72
74
94
Average
81.3
86.0
68.3
85.2
69.2
84.1
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
17.1
17
20
18
17
19
February
19.5
21
21
19
15
20
March
22.8
23
24
23
23
24
April
24.8
25
26
24
26
May
29.3
29
30
27
28
June
31.9
33
33
31
31
July
31.4
35
33
32
32
August
32.7
37
31
32
33
September
30.9
33
31
29
30
October
26.9
27
27
28
27
November
21.5
21
22
21
24
December
18.9
19
21
23
18
Average
24.7
19.9
27.0
26.6
25.2
25.9
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
7.4
6
10
7
7
10
February
10.4
10
11
6
5
10
March
13.3
13
15
10
13
17
April
15.1
15
16
15
17
May
19.9
20
21
20
20
June
22.7
23
23
23
22
July
22.6
24
24
24
24
August
23.4
25
24
23
23
September
21.2
22
20
21
22
October
15.9
15
13
18
17
November
9.8
10
10
8
12
December
9.0
9
12
13
7
Average
15.0
9.5
16.6
15.8
15.9
16.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.8
4
8
2
3
7
February
3.6
6
4
3
3
3
March
2.3
3
3
1
2
3
April
0.9
2
1
1
0
May
1.8
2
1
5
1
June
2.7
0
1
3
2
July
3.9
1
5
2
6
August
2.8
0
6
1
2
September
4.9
4
4
7
3
October
3.4
4
1
0
4
November
4.1
8
5
2
5
December
4.9
5
3
3
2
Average
3.6
4.2
3.0
2.6
2.6
3.2
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
7.2
7
7
9
8
7
February
8.0
8
8
8
8
8
March
8.0
8
8
8
8
8
April
7.3
7
8
7
8
May
6.3
5
7
7
7
June
5.5
6
5
6
6
July
4.7
5
4
4
6
August
4.3
6
3
4
5
September
4.1
4
4
4
6
October
5.7
7
5
5
6
November
5.7
6
6
4
5
December
6.0
5
6
7
7
Average
6.1
7.8
6.0
6.0
5.8
6.3
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
357°
151°
302°
265°
085°
February
220°
171°
057°
029°
189°
March
132°
142°
170°
120°
141°
April
108°
142°
107°
140°
May
137°
168°
122°
142°
June
207°
207°
148°
146°
July
209°
202°
200°
200°
August
216°
161°
180°
310°
September
056°
010°
090°
036°
October
059°
092°
161°
025°
November
029°
028°
036°
034°
December
013°
122°
166°
076°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.