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
84.0
76
83
85
93
87
February
82.5
88
88
79
74
82
March
85.0
83
89
76
88
85
April
83.6
86
77
92
90
86
May
82.8
95
75
88
86
June
84.7
82
88
86
92
July
90.1
91
95
87
87
August
91.1
90
94
90
91
September
88.4
79
96
93
92
October
84.4
90
83
89
78
November
92.0
96
93
99
85
December
81.7
72
83
79
86
Average
85.7
83.4
86.1
86.8
88.1
86.6
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
5.2
5
9
3
4
7
February
6.6
6
8
7
3
7
March
9.4
12
10
11
11
11
April
14.6
15
17
14
16
12
May
20.2
20
22
21
19
June
25.0
24
25
26
26
July
28.5
29
29
27
29
August
27.7
26
30
28
28
September
24.2
24
25
25
24
October
18.9
19
18
20
18
November
12.3
12
14
12
15
December
7.5
9
8
9
7
Average
15.8
9.5
17.2
17.4
16.9
16.9
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
-3.9
-1
2
-5
-3
0
February
-2.7
-1
-1
-3
-3
0
March
1.2
4
2
2
2
3
April
6.3
6
8
6
6
5
May
11.0
10
12
11
10
June
16.4
16
16
17
17
July
20.8
22
21
20
22
August
20.1
19
21
21
21
September
16.5
17
16
17
16
October
10.9
10
9
13
11
November
3.3
2
5
3
5
December
0.3
3
1
2
0
Average
7.8
2.0
9.1
8.7
8.9
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.1
23
16
18
3
8
February
14.7
10
11
18
29
18
March
12.3
17
12
13
6
11
April
12.1
15
12
8
10
13
May
10.5
4
12
9
6
June
5.6
3
7
4
4
July
4.5
4
2
7
8
August
6.0
7
3
11
8
September
8.4
20
6
9
3
October
12.8
9
17
8
21
November
8.9
4
10
6
12
December
14.3
13
16
9
15
Average
10.5
16.1
9.2
9.8
8.7
9.9
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
10.2
10
9
11
11
10
February
9.6
10
9
10
10
9
March
11.1
11
11
10
11
10
April
10.5
10
10
12
10
12
May
9.1
9
9
9
10
June
8.4
8
9
8
8
July
7.9
8
8
8
8
August
7.9
8
8
7
8
September
8.7
9
9
9
9
October
9.0
8
9
9
8
November
9.4
9
10
9
9
December
9.5
9
11
9
10
Average
9.3
10.1
8.8
9.4
9.0
9.3
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
305°
296°
308°
318°
293°
February
299°
283°
270°
338°
271°
March
318°
308°
265°
282°
360°
April
203°
171°
285°
295°
303°
May
241°
101°
278°
254°
June
172°
216°
207°
224°
July
201°
206°
221°
190°
August
237°
202°
205°
201°
September
028°
284°
276°
109°
October
284°
017°
332°
339°
November
291°
268°
294°
251°
December
302°
329°
288°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.