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
87.3
83
83
89
84
February
79.9
96
79
84
0
83
March
90.2
86
100
95
85
April
93.3
97
91
96
84
May
97.6
97
99
99
June
96.1
100
98
99
July
98.7
99
99
100
99
August
95.9
94
96
98
100
September
97.7
98
99
97
67
October
93.5
97
97
94
50
November
87.9
86
81
91
0
December
86.6
89
74
92
50
Average
92.3
90.5
92.9
93.0
94.7
91.1
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
18.7
16
21
19
20
February
20.2
21
18
18
0
20
March
23.7
23
25
23
25
April
26.3
26
25
28
27
May
29.4
29
31
29
June
31.8
32
33
32
July
32.9
34
33
33
33
August
33.1
35
33
33
32
September
31.5
33
32
31
27
October
27.8
27
28
29
21
November
22.0
21
21
23
20
December
20.6
20
22
24
17
Average
26.1
21.5
27.1
26.8
27.8
26.3
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
9.1
7
11
8
12
February
11.2
11
9
6
0
10
March
15.7
16
20
12
19
April
18.1
20
17
20
18
May
22.5
21
24
22
June
25.0
26
26
25
July
26.5
27
28
27
26
August
26.1
25
25
26
27
September
23.5
25
22
23
19
October
17.7
19
17
20
21
November
13.0
13
14
13
20
December
11.7
11
15
16
17
Average
17.9
13.3
18.8
18.2
19.7
19.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.6
8
5
7
5
February
4.8
5
4
9
0
2
March
3.5
5
0
3
3
April
2.8
1
3
7
3
May
2.4
3
5
3
June
4.6
0
2
14
July
2.7
4
1
28
4
August
4.5
1
8
11
2
September
7.4
3
5
11
67
October
5.8
17
1
2
0
November
9.9
16
15
14
100
December
6.7
6
4
3
75
Average
5.1
4.7
5.3
5.6
8.5
4.8
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
10.7
11
11
10
11
February
11.3
11
12
12
0
12
March
11.8
10
15
13
12
April
12.3
13
12
14
12
May
11.2
8
13
11
June
10.3
10
10
10
July
9.3
10
9
8
10
August
9.0
10
9
8
8
September
8.2
8
7
9
20
October
9.3
9
9
8
10
November
9.4
8
11
9
8
December
9.2
8
10
10
9
Average
10.2
11.4
9.6
10.6
8.7
10.9
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
014°
051°
014°
081°
February
147°
028°
018°
360°
081°
March
113°
105°
128°
138°
April
139°
105°
135°
100°
May
128°
157°
148°
June
177°
169°
143°
July
181°
180°
155°
163°
August
168°
164°
158°
168°
September
151°
112°
113°
012°
October
110°
111°
136°
005°
November
047°
064°
069°
074°
December
074°
097°
158°
152°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.