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
86.9
76
93
90
92
87
February
84.2
96
91
83
71
83
March
85.9
85
92
85
84
81
April
88.1
88
94
75
90
May
87.4
96
87
93
91
June
89.9
88
92
95
96
July
90.7
92
98
91
92
August
92.7
94
95
95
91
September
89.0
83
94
95
93
October
86.0
94
83
88
80
November
93.4
97
91
98
88
December
84.2
76
77
88
91
Average
88.1
85.8
90.4
90.0
88.6
88.9
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
4.7
5
8
3
4
7
February
7.5
8
10
8
3
9
March
10.7
13
11
13
13
13
April
16.4
19
16
15
15
May
22.0
22
23
23
21
June
26.7
26
27
28
28
July
29.7
30
31
30
31
August
28.2
28
31
29
29
September
24.7
25
25
24
24
October
18.9
20
17
19
19
November
11.9
12
14
12
16
December
7.0
9
7
10
7
Average
16.4
8.5
18.6
18.2
17.4
18.0
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
-3.0
-2
0
-6
-3
-1
February
-2.2
-2
-1
-4
-4
-1
March
0.9
3
1
1
1
3
April
5.8
8
5
5
5
May
10.5
8
12
10
10
June
15.3
14
15
17
16
July
19.1
20
20
19
20
August
17.6
18
19
19
19
September
14.3
14
14
18
12
October
8.7
8
6
13
8
November
0.9
-1
3
0
3
December
-1.0
1
-1
1
-1
Average
6.4
-1.7
7.6
7.3
7.9
7.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.6
20
16
13
6
7
February
7.9
7
7
12
24
14
March
7.1
14
12
10
10
11
April
4.9
9
9
6
12
May
4.3
3
11
8
7
June
4.1
8
5
7
4
July
3.3
6
3
4
6
August
3.1
4
1
5
8
September
3.5
9
7
9
2
October
7.4
6
12
7
11
November
3.7
3
8
4
9
December
9.0
15
18
3
12
Average
6.1
13.6
7.5
8.1
7.4
8.0
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
5.8
6
7
6
7
6
February
5.6
5
6
7
6
6
March
6.6
7
7
7
7
7
April
6.3
7
8
5
8
May
5.3
5
6
5
7
June
4.8
5
5
5
5
July
3.7
4
5
4
4
August
3.9
4
5
4
5
September
4.1
5
5
6
4
October
4.8
5
5
6
5
November
5.4
5
6
6
6
December
5.1
5
6
5
6
Average
5.2
6.2
5.3
5.8
5.3
5.6
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
294°
282°
290°
308°
287°
February
286°
263°
263°
304°
263°
March
298°
287°
258°
279°
282°
April
248°
286°
290°
289°
May
305°
082°
285°
261°
June
358°
255°
222°
260°
July
228°
234°
251°
247°
August
260°
232°
229°
238°
September
023°
280°
264°
113°
October
281°
260°
086°
271°
November
286°
267°
278°
251°
December
286°
301°
260°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.