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
87.1
79
87
91
94
91
February
84.2
91
88
80
77
82
March
85.4
85
89
83
87
83
April
88.8
86
95
94
89
May
85.4
97
82
91
86
June
91.7
86
95
97
98
July
92.9
94
98
91
93
August
94.9
94
97
96
97
September
90.3
83
93
93
94
October
85.5
87
87
87
82
November
94.5
99
92
99
93
December
84.3
78
83
82
94
Average
88.5
85.1
89.4
90.2
91.1
89.7
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
4.8
5
9
2
4
7
February
7.3
8
9
8
3
8
March
10.6
13
11
12
13
13
April
16.8
19
16
18
14
May
22.1
22
23
23
20
June
26.9
26
27
29
28
July
30.2
30
31
30
32
August
28.7
27
31
29
30
September
24.9
24
25
25
25
October
19.5
20
20
20
18
November
12.0
12
14
12
16
December
7.0
10
7
10
7
Average
16.5
8.3
18.3
18.4
18.0
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
-4.4
-2
1
-7
-4
-2
February
-3.2
-2
-3
-5
-5
-1
March
0.2
3
0
0
0
2
April
5.4
7
5
5
4
May
10.2
8
12
9
10
June
13.6
13
11
16
13
July
17.6
15
18
19
20
August
17.3
16
18
18
18
September
13.6
14
13
15
13
October
8.1
8
6
10
9
November
0.4
-1
2
0
3
December
-2.5
1
-1
0
-2
Average
5.7
-1.5
6.5
6.4
6.8
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.5
17
9
11
3
5
February
10.7
7
4
14
19
11
March
10.9
11
11
11
8
11
April
8.3
9
6
10
12
May
8.1
2
10
9
6
June
3.7
4
3
4
2
July
3.3
2
2
3
3
August
3.8
5
1
5
3
September
6.8
17
4
4
2
October
6.9
10
8
4
9
November
5.7
2
7
6
6
December
11.4
14
18
3
9
Average
7.7
11.7
6.9
6.9
6.1
6.6
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
6.5
6
5
6
8
7
February
6.6
6
6
6
6
7
March
7.6
8
8
7
7
7
April
7.6
7
8
8
8
May
5.8
6
5
6
7
June
5.4
5
5
5
6
July
4.8
4
5
5
6
August
5.0
5
5
5
6
September
5.1
5
5
6
6
October
5.7
5
5
5
6
November
6.0
6
6
5
6
December
5.6
5
6
5
7
Average
6.1
6.7
5.6
5.4
5.8
6.5
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
304°
303°
314°
330°
302°
February
314°
293°
293°
320°
291°
March
323°
315°
292°
314°
302°
April
276°
313°
309°
319°
May
279°
124°
316°
313°
June
004°
272°
246°
280°
July
239°
265°
280°
256°
August
292°
246°
244°
252°
September
024°
297°
287°
320°
October
295°
344°
324°
289°
November
298°
287°
291°
268°
December
308°
324°
288°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.