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
86.5
77
85
88
93
90
February
83.6
94
89
78
77
83
March
86.2
84
90
81
90
84
April
90.8
91
83
93
93
93
May
88.9
96
88
95
95
June
91.9
82
92
92
97
July
94.9
92
98
95
95
August
94.3
94
95
97
97
September
91.9
90
95
97
92
October
87.2
92
83
88
84
November
95.1
98
92
98
92
December
82.1
75
74
80
90
Average
89.5
86.8
89.0
89.0
91.7
91.3
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
4.2
4
7
1
3
7
February
7.1
8
9
7
2
8
March
10.7
12
10
12
12
14
April
17.3
17
19
15
17
16
May
22.6
22
23
22
21
June
26.9
25
26
28
28
July
30.0
29
31
29
31
August
28.7
27
31
29
29
September
24.8
24
24
25
24
October
19.1
19
17
20
18
November
11.4
11
13
11
14
December
6.4
8
6
9
6
Average
16.6
10.0
17.6
17.3
17.2
17.9
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
-4.7
-3
0
-8
-3
-1
February
-3.5
-3
-3
-5
-5
-1
March
0.5
2
0
0
1
3
April
6.1
6
7
5
6
6
May
11.0
8
12
10
10
June
15.7
14
15
17
16
July
19.2
19
19
18
20
August
18.4
17
19
19
19
September
14.3
14
13
14
13
October
9.0
8
6
11
8
November
1.1
0
3
0
3
December
-2.8
1
-2
1
-3
Average
6.6
0.8
7.0
6.6
7.4
7.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.3
20
15
15
6
7
February
12.4
10
5
18
23
12
March
12.6
16
14
16
10
10
April
10.3
13
9
14
6
14
May
9.5
3
13
8
8
June
6.2
7
6
5
2
July
4.1
2
3
3
5
August
4.8
3
2
7
6
September
7.7
13
9
6
3
October
9.7
7
15
7
13
November
7.4
2
12
3
10
December
12.6
16
29
2
13
Average
9.4
14.8
7.5
11.4
7.0
8.1
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
7.6
7
7
7
9
7
February
7.2
6
7
8
7
7
March
8.8
9
9
9
9
7
April
8.4
8
8
9
8
10
May
6.9
6
7
7
8
June
6.5
7
6
6
6
July
5.4
5
6
5
5
August
5.7
6
6
5
6
September
6.0
7
7
7
5
October
6.6
6
7
7
6
November
6.9
6
7
6
7
December
6.7
6
7
6
8
Average
6.9
7.5
6.6
7.0
6.7
6.9
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
298°
296°
299°
311°
296°
February
285°
283°
279°
322°
275°
March
310°
293°
284°
293°
315°
April
264°
240°
290°
291°
302°
May
291°
099°
303°
257°
June
023°
268°
229°
263°
July
247°
243°
279°
253°
August
281°
248°
238°
270°
September
029°
304°
267°
360°
October
282°
016°
284°
290°
November
290°
268°
278°
267°
December
290°
320°
272°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.