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
86.6
71
93
89
91
90
February
84.7
96
88
77
75
86
March
86.6
82
91
81
88
85
April
91.5
86
94
94
93
May
88.3
94
87
94
93
June
93.3
85
93
98
97
July
94.6
94
99
93
94
August
95.5
95
97
97
95
September
91.8
85
95
97
94
October
87.0
93
79
94
82
November
93.9
96
87
100
94
December
85.1
76
75
90
92
Average
89.5
82.4
89.8
88.7
93.0
91.4
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
6.4
6
10
3
6
9
February
9.1
10
10
8
4
11
March
12.4
14
12
14
14
15
April
18.4
20
17
18
16
May
23.4
23
24
23
22
June
28.2
27
28
29
30
July
31.3
31
32
30
32
August
29.9
29
32
30
29
September
26.0
26
26
26
23
October
20.4
21
18
21
20
November
13.4
13
15
12
17
December
8.6
10
8
11
8
Average
17.9
9.8
19.3
19.1
18.6
19.2
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
-2.9
0
3
-5
-1
1
February
0.0
1
0
-2
-2
1
March
2.6
5
2
3
2
5
April
7.9
9
7
7
7
May
13.0
11
14
11
12
June
17.8
16
18
18
19
July
21.8
22
23
21
22
August
20.9
20
22
21
21
September
16.5
17
16
17
11
October
11.4
11
9
13
11
November
3.5
3
5
3
5
December
1.0
3
1
3
0
Average
8.6
1.6
9.7
9.3
9.3
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.7
17
11
12
3
3
February
10.0
6
6
15
17
9
March
10.4
14
9
11
8
10
April
5.6
8
7
4
7
May
6.5
3
9
5
4
June
3.4
4
4
4
2
July
3.9
5
2
3
4
August
3.3
4
1
4
6
September
5.3
10
6
3
2
October
6.6
3
15
2
9
November
5.4
3
11
3
5
December
9.1
11
19
1
9
Average
7.0
12.6
5.9
8.4
4.6
5.4
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
8.6
8
8
9
9
9
February
8.0
7
8
8
8
8
March
9.6
10
10
9
9
9
April
9.2
9
10
9
10
May
7.6
7
8
7
9
June
7.1
7
7
7
7
July
5.9
5
7
6
6
August
6.3
6
7
6
7
September
7.1
8
7
8
6
October
7.2
6
7
8
7
November
7.8
7
8
8
8
December
7.6
7
8
7
9
Average
7.7
8.3
7.2
7.8
7.5
7.7
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
323°
301°
312°
319°
301°
February
317°
292°
293°
335°
280°
March
318°
309°
290°
302°
347°
April
297°
304°
301°
314°
May
338°
060°
318°
331°
June
010°
291°
234°
297°
July
246°
257°
286°
293°
August
317°
255°
330°
273°
September
025°
316°
308°
020°
October
306°
008°
320°
332°
November
303°
286°
293°
275°
December
298°
318°
280°
289°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.