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
82.4
79
77
85
83
78
February
78.7
96
81
82
69
79
March
83.6
82
81
94
80
76
April
86.0
87
90
80
74
May
92.6
97
99
86
98
June
96.5
98
89
98
98
July
98.8
99
100
98
99
August
99.1
98
98
100
100
September
97.8
100
98
99
95
October
94.7
97
98
95
96
November
87.9
87
79
95
94
December
90.1
96
71
88
97
Average
90.5
85.5
91.7
91.5
89.7
90.4
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
15.4
17
20
5
9
20
February
18.9
20
20
16
15
19
March
22.2
23
23
21
22
24
April
25.3
25
26
24
26
May
27.5
28
29
27
28
June
30.6
31
31
31
30
July
31.2
31
32
31
31
August
31.7
32
31
32
32
September
28.5
32
18
31
30
October
22.2
28
0
28
28
November
20.7
22
14
23
25
December
20.3
21
22
22
20
Average
24.3
20.2
25.9
20.4
24.6
26.0
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
9.2
10
14
3
1
15
February
12.7
15
13
8
9
13
March
17.1
18
18
15
16
20
April
20.3
20
22
20
21
May
23.2
24
25
23
24
June
26.3
26
26
26
26
July
26.9
27
28
27
27
August
25.7
28
14
28
28
September
21.6
28
0
26
25
October
17.6
22
0
23
22
November
15.2
17
9
18
20
December
14.2
15
17
17
13
Average
18.9
14.2
21.1
13.7
19.5
20.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.1
4
0
4
3
5
February
1.6
3
1
1
3
1
March
2.2
2
1
0
4
1
April
1.3
2
0
3
2
May
0.9
1
0
2
2
June
1.8
0
0
2
3
July
2.3
2
0
8
3
August
1.8
1
5
2
0
September
3.1
1
6
1
2
October
2.9
7
2
2
1
November
6.1
11
8
5
3
December
2.5
3
1
3
1
Average
2.5
2.5
2.3
2.2
3.1
1.9
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
10
10
10
9
9
February
9.8
10
10
11
9
10
March
10.1
9
11
11
10
10
April
11.0
12
12
11
11
May
10.5
8
12
11
11
June
9.8
9
10
9
10
July
9.2
8
10
9
10
August
9.0
9
10
8
9
September
9.1
8
7
9
11
October
9.7
10
10
9
10
November
9.6
9
12
9
9
December
8.9
8
9
9
9
Average
9.7
9.8
9.4
10.2
9.4
9.9
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
012°
046°
004°
047°
077°
February
086°
073°
020°
066°
059°
March
085°
093°
070°
070°
107°
April
081°
115°
087°
082°
May
100°
139°
106°
119°
June
143°
133°
133°
124°
July
137°
146°
143°
129°
August
125°
136°
136°
137°
September
122°
080°
086°
032°
October
058°
085°
096°
071°
November
023°
031°
060°
062°
December
040°
069°
129°
359°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.