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
86.2
71
95
87
94
89
February
85.5
96
94
79
79
84
March
87.1
82
93
83
86
85
April
90.0
88
84
89
94
93
May
87.5
97
83
95
91
June
91.5
82
95
92
94
July
94.1
93
96
93
93
August
94.3
96
93
96
92
September
91.4
90
92
98
92
October
87.3
92
82
92
83
November
87.9
57
87
99
90
December
82.4
66
76
90
92
Average
88.7
83.6
87.5
87.6
92.6
89.9
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
6.3
6
10
4
6
9
February
8.9
9
10
10
4
10
March
12.3
14
13
14
14
15
April
18.2
18
21
17
18
16
May
23.0
23
24
23
21
June
27.8
28
28
29
28
July
30.7
31
31
30
32
August
29.5
29
31
30
29
September
25.9
26
26
26
25
October
20.3
21
18
22
19
November
13.1
12
15
13
16
December
8.3
10
8
11
8
Average
17.9
11.5
19.4
19.2
18.8
18.8
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
-2.6
-1
2
-4
-2
0
February
-1.7
0
0
-1
-2
1
March
2.4
4
3
3
3
5
April
8.0
8
10
7
8
7
May
12.8
11
14
12
11
June
17.5
16
18
18
18
July
21.2
22
22
20
20
August
20.4
21
21
21
19
September
16.4
16
16
17
16
October
10.9
10
8
13
10
November
3.1
2
5
2
5
December
0.5
2
1
3
0
Average
8.5
2.6
9.7
9.5
9.4
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.0
21
12
15
6
5
February
13.2
13
7
16
18
16
March
11.7
19
9
11
10
11
April
7.6
12
10
8
4
8
May
8.9
4
12
6
5
June
5.8
10
4
6
2
July
4.7
6
6
3
4
August
5.0
3
1
6
9
September
6.1
13
8
5
3
October
8.6
6
11
9
10
November
7.1
6
13
4
8
December
11.6
12
25
4
9
Average
9.0
16.1
8.0
9.8
6.6
7.1
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
9.1
8
9
9
10
9
February
8.7
8
9
9
9
8
March
10.3
10
10
11
10
9
April
9.9
9
9
11
10
11
May
8.2
7
9
8
9
June
7.8
8
8
7
8
July
6.8
7
7
7
7
August
6.9
8
7
7
7
September
7.4
8
8
8
7
October
7.9
7
8
8
7
November
8.7
8
9
9
9
December
8.0
7
9
7
10
Average
8.4
8.9
8.0
8.5
8.1
8.2
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
308°
295°
309°
315°
300°
February
301°
280°
281°
331°
274°
March
310°
301°
274°
292°
292°
April
238°
247°
300°
292°
304°
May
289°
089°
294°
316°
June
320°
244°
199°
253°
July
207°
233°
259°
221°
August
259°
233°
192°
228°
September
019°
313°
280°
047°
October
298°
359°
316°
302°
November
303°
276°
297°
264°
December
301°
315°
281°
280°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.