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
85.0
81
80
82
92
86
February
82.0
86
83
81
71
79
March
92.6
89
94
96
92
88
April
93.6
89
93
98
98
May
95.5
95
94
96
97
June
96.3
92
99
96
99
July
96.2
95
96
92
98
August
95.3
96
96
89
95
September
94.2
97
96
91
92
October
93.2
96
99
95
85
November
92.9
95
92
95
96
December
85.1
89
71
84
85
Average
91.5
85.6
92.0
92.4
91.3
91.8
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
10.1
7
13
8
10
12
February
14.1
16
16
13
9
13
March
17.5
19
17
19
19
18
April
21.6
22
21
21
21
May
26.5
26
28
25
24
June
30.4
30
32
30
30
July
32.0
32
33
31
33
August
31.0
31
31
31
31
September
28.8
29
29
27
27
October
23.0
24
22
24
22
November
15.8
18
16
15
18
December
12.7
13
12
17
11
Average
21.0
14.1
22.6
22.4
21.6
21.6
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
0.1
-2
3
-3
0
3
February
2.5
3
5
-1
-2
2
March
5.4
7
5
5
5
8
April
8.7
9
9
8
8
May
14.7
15
16
12
13
June
18.6
16
20
19
19
July
20.4
21
23
15
22
August
19.9
21
21
18
21
September
15.5
16
15
16
17
October
10.4
11
8
13
10
November
3.0
4
4
1
4
December
1.9
2
4
5
-1
Average
9.2
2.3
10.5
10.1
9.3
10.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.9
22
15
19
7
18
February
15.2
12
10
18
15
20
March
8.0
10
6
6
6
12
April
8.1
8
7
8
5
May
5.1
6
3
5
7
June
3.0
3
1
3
2
July
2.9
4
4
4
1
August
4.1
5
2
7
5
September
5.7
4
5
9
4
October
6.1
4
3
6
8
November
6.5
4
6
5
7
December
11.9
8
24
6
7
Average
8.0
14.2
6.3
6.9
6.6
7.4
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
7.1
7
7
7
7
6
February
7.2
7
8
7
7
7
March
7.8
7
8
8
7
7
April
7.2
7
8
7
7
May
6.2
6
7
6
6
June
5.8
6
6
6
6
July
4.9
5
5
5
5
August
4.9
6
5
5
5
September
5.0
5
6
5
5
October
5.8
7
7
5
5
November
6.0
6
6
6
6
December
6.2
6
6
6
6
Average
6.3
7.1
6.3
6.4
5.8
6.0
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
277°
234°
318°
274°
243°
February
269°
230°
266°
318°
264°
March
233°
273°
231°
336°
253°
April
260°
225°
275°
295°
May
353°
204°
054°
230°
June
295°
353°
196°
206°
July
256°
224°
265°
251°
August
310°
196°
185°
349°
September
007°
011°
341°
003°
October
288°
255°
216°
312°
November
280°
287°
253°
246°
December
240°
210°
201°
249°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.