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
84.8
84
76
91
90
77
February
85.0
97
84
89
77
81
March
91.8
86
90
96
91
90
April
92.2
91
96
91
93
May
94.0
96
95
93
96
June
94.8
97
97
92
94
July
95.4
98
96
93
92
August
93.4
97
85
94
96
September
94.5
98
94
87
93
October
91.7
91
96
94
93
November
88.5
84
87
95
90
December
84.7
90
77
85
95
Average
90.9
88.7
91.3
92.1
90.4
91.3
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
17.7
17
20
17
17
19
February
21.2
23
22
20
16
20
March
24.1
24
25
23
24
26
April
26.0
26
26
25
27
May
29.9
31
31
28
29
June
32.4
35
34
31
32
July
33.2
36
34
32
33
August
33.2
38
32
32
34
September
31.7
34
31
30
30
October
27.6
28
27
28
28
November
21.8
22
22
21
24
December
19.2
20
21
23
18
Average
25.9
21.2
28.2
26.7
25.4
26.5
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
6.6
5
10
4
7
9
February
10.1
10
11
6
5
10
March
12.9
13
15
10
13
17
April
14.2
16
14
13
15
May
18.7
20
20
18
18
June
22.4
24
22
23
22
July
24.0
26
24
23
25
August
23.5
26
24
21
24
September
21.2
22
20
20
22
October
15.9
16
13
17
15
November
9.7
11
10
8
12
December
8.9
8
12
13
6
Average
15.0
9.4
17.0
15.0
15.0
16.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.0
7
11
4
3
10
February
6.4
5
6
6
6
10
March
3.2
5
4
1
5
2
April
3.1
6
4
4
2
May
3.5
2
1
9
4
June
5.0
2
2
8
5
July
4.9
1
5
5
9
August
4.7
1
8
5
2
September
3.7
2
5
8
6
October
4.9
5
2
2
5
November
5.2
9
8
2
6
December
7.3
6
7
8
4
Average
4.9
5.4
4.2
4.2
5.4
5.3
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
7.7
8
8
8
8
8
February
8.3
9
8
8
8
8
March
8.2
7
8
9
9
8
April
7.9
8
9
8
8
May
6.7
6
7
8
7
June
6.5
6
6
7
7
July
5.6
6
5
4
7
August
5.7
7
5
5
6
September
5.5
5
5
5
7
October
6.4
7
6
6
7
November
6.0
6
7
5
7
December
6.8
6
6
7
7
Average
6.9
7.8
6.7
6.6
6.6
7.1
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
041°
185°
317°
267°
103°
February
196°
199°
121°
043°
207°
March
120°
176°
190°
136°
161°
April
108°
148°
105°
111°
May
110°
174°
110°
136°
June
238°
266°
135°
141°
July
259°
215°
236°
199°
August
261°
147°
064°
344°
September
053°
032°
061°
045°
October
064°
101°
097°
050°
November
049°
055°
058°
054°
December
077°
159°
181°
081°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.