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
75.7
60
70
75
80
82
February
86.7
75
76
99
90
98
March
84.8
77
68
94
92
95
April
96.3
99
92
99
97
May
96.5
95
98
99
97
June
99.1
99
100
100
99
July
94.5
99
99
97
99
August
83.3
94
99
72
88
September
92.3
95
98
93
81
October
97.8
99
100
94
98
November
91.7
97
79
96
93
December
84.2
80
68
76
95
Average
88.6
70.9
88.4
92.6
91.1
93.7
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
7.1
7
6
9
7
7
February
9.2
9
8
13
9
13
March
11.0
11
6
15
12
11
April
16.6
16
15
20
18
May
21.8
22
20
23
22
June
27.1
26
27
30
26
July
31.7
33
32
34
31
August
31.1
30
33
31
31
September
26.0
24
28
27
29
October
19.7
20
24
16
23
November
11.5
12
8
13
11
December
6.6
9
3
6
8
Average
17.2
8.8
17.7
19.4
19.0
19.0
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
-1.0
1
-1
-2
-1
-1
February
-2.6
1
-2
-2
-1
-2
March
-1.8
1
-3
2
-1
0
April
2.6
2
1
2
4
May
5.8
6
5
6
6
June
9.6
9
9
12
10
July
11.4
12
12
13
11
August
11.6
12
13
12
12
September
8.1
8
9
8
9
October
3.5
5
5
4
5
November
0.1
1
-2
1
-1
December
-2.4
1
-4
-1
-3
Average
3.6
0.6
4.1
4.0
4.5
4.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
22.0
29
38
8
16
14
February
17.5
34
28
1
9
1
March
21.2
35
38
11
11
12
April
9.1
6
11
2
7
May
5.8
8
6
2
9
June
1.7
2
2
2
1
July
0.4
0
1
1
0
August
0.7
2
2
0
0
September
2.3
7
2
1
0
October
2.5
4
1
10
1
November
10.8
3
15
9
6
December
14.0
23
26
18
7
Average
11.1
32.6
14.0
6.6
6.2
4.7
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
2.4
2
3
2
3
2
February
3.2
2
3
3
4
4
March
2.6
3
2
3
3
3
April
2.9
3
3
3
3
May
2.2
1
2
3
2
June
1.9
1
1
1
2
July
1.1
1
1
1
1
August
1.1
1
1
2
1
September
1.4
1
1
1
1
October
2.0
1
1
1
3
November
2.2
2
2
2
2
December
2.4
2
2
2
2
Average
2.1
2.3
1.8
1.7
2.1
2.2
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
118°
089°
035°
082°
088°
February
121°
029°
314°
324°
321°
March
111°
099°
328°
009°
334°
April
304°
006°
319°
321°
May
157°
338°
322°
025°
June
316°
314°
353°
320°
July
105°
035°
055°
315°
August
341°
065°
327°
321°
September
314°
334°
292°
001°
October
345°
297°
069°
318°
November
135°
322°
059°
352°
December
110°
097°
095°
006°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.