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
84.2
80
79
84
86
79
February
77.5
94
83
88
76
82
March
84.9
81
84
93
82
73
April
88.3
85
92
80
82
May
97.5
97
100
94
99
June
98.5
96
100
99
98
July
99.2
100
100
99
98
August
97.3
95
96
100
100
September
94.9
100
94
100
98
October
94.6
97
93
96
97
November
89.4
87
78
94
95
December
87.2
93
71
91
97
Average
90.6
84.8
91.5
91.6
91.6
91.6
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
20.4
20
23
20
21
21
February
21.6
24
23
19
18
21
March
24.7
26
27
24
24
25
April
27.5
27
29
26
28
May
30.6
31
32
29
30
June
32.8
34
34
32
31
July
33.4
35
35
32
32
August
33.8
35
34
34
33
September
31.4
35
32
33
32
October
29.1
30
29
30
30
November
24.2
24
23
25
27
December
22.2
23
24
25
22
Average
27.1
23.2
28.9
28.1
27.5
27.6
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
11.5
6
15
11
12
14
February
12.6
13
15
9
10
12
March
16.0
17
18
15
17
18
April
20.5
21
22
20
21
May
24.2
25
25
24
24
June
25.6
27
27
26
22
July
26.8
29
25
27
26
August
25.7
23
26
28
27
September
22.9
27
18
26
25
October
20.2
20
18
20
20
November
15.4
14
12
16
18
December
13.0
11
12
19
12
Average
18.7
12.1
20.4
18.5
20.3
19.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
9
4
7
4
7
February
5.9
5
4
3
6
5
March
4.1
3
4
2
6
3
April
3.0
7
1
4
4
May
1.4
3
0
2
2
June
2.2
0
1
3
4
July
2.1
2
0
7
5
August
2.9
5
8
1
1
September
4.0
0
9
2
4
October
3.6
5
4
3
1
November
6.7
14
9
3
3
December
5.5
4
5
2
2
Average
4.0
5.5
4.1
3.8
3.4
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
11.3
11
12
11
11
11
February
12.4
12
13
12
13
12
March
13.3
12
15
14
13
13
April
14.0
14
15
14
13
May
13.4
10
15
14
14
June
12.2
14
12
11
12
July
11.9
13
13
10
13
August
11.7
13
12
10
11
September
9.9
9
8
11
12
October
11.2
11
11
10
11
November
11.0
10
13
10
11
December
10.4
9
11
12
11
Average
11.9
11.7
11.9
12.4
11.6
12.0
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
028°
083°
016°
071°
102°
February
124°
120°
040°
073°
093°
March
105°
117°
108°
095°
131°
April
097°
131°
107°
098°
May
112°
145°
120°
129°
June
150°
137°
137°
129°
July
146°
148°
145°
141°
August
131°
139°
139°
139°
September
122°
084°
097°
054°
October
081°
098°
105°
087°
November
043°
046°
085°
081°
December
062°
107°
147°
095°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.