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
69.7
55
70
49
72
69
February
82.4
80
85
85
80
89
March
91.7
91
95
75
99
97
April
93.0
94
92
91
99
96
May
95.2
95
97
88
99
95
June
95.7
97
98
92
99
93
July
97.3
96
99
94
100
97
August
97.1
99
95
100
99
98
September
89.8
98
98
88
71
October
86.1
83
96
83
83
November
81.8
86
77
74
85
December
76.7
68
84
81
77
Average
89.4
89.4
89.8
86.7
90.6
88.4
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
6.8
6
7
6
8
7
February
7.2
9
7
9
7
8
March
10.7
11
10
11
11
10
April
13.9
14
12
12
16
15
May
19.6
19
23
15
19
19
June
22.0
21
23
21
25
21
July
26.2
28
27
26
27
25
August
26.3
25
27
28
27
25
September
21.6
21
24
21
23
October
15.2
15
19
13
15
November
9.4
10
7
10
10
December
6.2
8
3
4
8
Average
15.6
16.5
16.0
15.5
15.6
15.4
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
1.1
1
3
0
3
2
February
0.1
1
1
1
0
1
March
1.8
3
1
4
2
1
April
4.5
5
4
3
5
4
May
8.9
8
10
7
8
9
June
11.8
11
12
12
13
12
July
13.7
14
14
14
14
13
August
13.7
13
14
15
14
13
September
10.8
10
11
11
11
October
5.9
7
7
6
7
November
2.7
3
-1
4
3
December
0.9
4
-2
-1
2
Average
6.5
7.0
6.6
6.2
6.6
6.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
30.4
43
30
21
27
49
February
22.5
22
29
12
21
18
March
18.1
25
20
26
13
12
April
20.0
14
26
28
10
12
May
11.5
13
5
29
10
12
June
9.1
12
7
14
5
12
July
3.9
2
4
11
1
4
August
2.6
6
2
0
2
5
September
11.6
10
2
18
6
October
18.5
23
11
30
14
November
23.2
12
18
42
28
December
28.8
31
24
28
32
Average
15.4
16.0
15.4
16.2
15.8
15.5
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
3.8
4
3
3
5
5
February
4.0
4
4
4
5
5
March
4.6
4
5
4
5
5
April
5.4
5
6
6
5
5
May
4.8
5
4
5
5
5
June
4.9
5
5
5
5
5
July
4.7
5
5
4
5
5
August
4.7
4
5
5
5
5
September
4.3
5
4
4
4
October
4.0
4
4
5
4
November
3.8
4
3
4
5
December
3.3
3
3
4
3
Average
4.5
4.6
4.5
4.3
4.7
4.5
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
134°
095°
116°
125°
144°
February
075°
122°
012°
046°
079°
March
106°
131°
076°
101°
067°
April
055°
125°
148°
042°
076°
May
042°
042°
125°
039°
095°
June
089°
031°
075°
059°
050°
July
037°
045°
050°
047°
052°
August
051°
023°
049°
051°
043°
September
059°
035°
083°
054°
October
074°
051°
114°
049°
November
085°
090°
134°
143°
December
132°
221°
196°
143°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.