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
87.0
76
94
90
89
February
87.6
94
94
90
75
March
88.3
83
94
89
89
0
April
88.6
91
93
91
May
90.0
99
87
98
100
June
91.4
88
94
91
96
July
96.6
98
96
97
98
August
95.4
96
97
95
94
September
93.0
89
93
97
93
October
88.3
96
81
90
83
November
95.5
96
91
99
95
December
84.1
81
74
94
91
Average
89.7
84.2
93.0
90.5
92.4
93.4
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
5.7
6
9
4
5
February
9.5
10
12
10
5
March
12.6
15
13
15
15
10
April
20.1
22
18
20
May
25.0
24
26
24
26
June
29.0
28
30
31
27
July
32.6
33
32
32
35
August
31.4
31
32
32
31
September
26.8
27
26
27
26
October
20.6
21
18
22
21
November
13.4
14
15
12
17
December
8.7
10
8
12
8
Average
18.3
10.5
20.4
20.1
19.9
23.2
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
-2.7
0
3
-4
-1
February
0.4
1
2
0
-2
March
2.5
5
3
3
4
10
April
7.8
10
7
8
May
12.5
11
13
12
26
June
16.7
16
18
18
16
July
19.9
18
21
20
21
August
18.8
18
20
19
18
September
15.5
16
15
17
13
October
10.3
9
9
12
10
November
4.3
3
6
3
7
December
1.8
3
1
3
0
Average
8.1
1.9
9.1
9.4
9.4
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.8
19
12
11
7
February
9.3
4
5
8
19
March
11.0
14
10
9
10
0
April
8.2
8
7
6
May
9.6
6
10
10
0
June
6.0
8
5
6
2
July
3.8
2
7
2
3
August
4.4
3
3
5
10
September
7.0
12
7
8
3
October
9.0
7
11
8
9
November
6.6
7
9
5
7
December
10.2
9
13
3
13
Average
8.6
11.9
7.1
7.8
7.2
6.0
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
7.0
7
7
6
6
February
6.8
6
7
8
6
March
7.7
7
8
8
7
0
April
6.9
6
7
7
May
5.2
5
6
5
10
June
5.0
5
5
5
5
July
4.3
5
4
4
4
August
4.5
5
5
4
5
September
4.4
4
5
5
4
October
5.4
5
5
5
5
November
6.4
6
7
6
7
December
5.5
5
5
6
7
Average
6.0
6.7
5.5
5.9
5.4
5.1
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
281°
263°
288°
300°
February
255°
253°
249°
286°
March
288°
280°
236°
274°
360°
April
246°
271°
276°
May
277°
114°
295°
207°
June
277°
260°
220°
245°
July
237°
232°
249°
243°
August
254°
235°
201°
238°
September
348°
280°
248°
199°
October
275°
235°
264°
251°
November
266°
245°
277°
246°
December
260°
272°
235°
260°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.