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
76.4
60
74
90
74
78
February
85.1
97
93
85
93
74
March
88.6
89
85
97
95
83
April
94.4
92
96
94
97
96
May
93.9
99
90
95
97
June
94.9
87
99
95
97
July
96.4
96
94
96
98
August
95.5
95
92
98
97
September
95.7
96
97
97
94
October
91.5
93
97
87
90
November
90.2
93
91
94
94
December
85.5
83
70
85
96
Average
90.7
85.4
91.1
92.3
92.7
91.6
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
3.2
2
6
1
3
5
February
7.2
11
11
5
1
5
March
11.9
15
12
14
15
13
April
17.6
19
19
16
18
16
May
23.4
24
25
22
21
June
28.0
28
29
28
29
July
29.6
29
30
28
31
August
28.6
28
29
30
28
September
26.4
26
25
27
25
October
19.0
19
19
20
18
November
10.8
13
12
10
15
December
7.0
9
6
11
6
Average
17.0
11.5
18.6
18.0
17.6
17.6
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
-4.0
-4
0
-8
-3
-1
February
-3.7
0
0
-5
-7
-3
March
1.9
4
1
2
3
4
April
6.8
9
6
7
7
6
May
13.1
12
14
11
12
June
17.9
17
18
19
18
July
20.3
20
21
20
21
August
19.0
19
19
20
19
September
16.1
16
15
16
14
October
9.2
10
7
13
8
November
1.7
3
3
1
5
December
-1.0
2
-1
1
-2
Average
7.5
2.2
8.7
8.0
8.4
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
20.0
24
21
16
18
16
February
15.5
6
7
26
15
26
March
13.7
7
17
14
10
15
April
11.7
14
13
12
11
10
May
8.7
5
11
11
8
June
5.2
6
2
7
4
July
4.2
3
7
4
4
August
3.5
4
4
2
2
September
4.2
2
4
6
2
October
11.0
9
8
12
9
November
10.0
7
14
5
9
December
13.6
12
14
12
12
Average
10.1
12.7
8.5
10.4
9.0
9.0
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
9.8
10
10
10
9
9
February
10.3
10
11
10
10
10
March
11.2
12
12
12
11
11
April
10.6
11
10
12
11
10
May
9.1
8
10
8
9
June
8.5
9
8
8
8
July
7.5
8
8
7
7
August
7.5
8
8
8
7
September
7.7
6
8
9
8
October
9.3
9
10
8
9
November
9.5
9
10
9
10
December
9.3
9
9
10
10
Average
9.3
10.8
9.0
9.4
8.8
8.9
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
245°
263°
277°
230°
232°
February
253°
234°
251°
320°
280°
March
236°
242°
240°
198°
251°
April
243°
233°
219°
251°
266°
May
063°
173°
200°
222°
June
001°
249°
214°
213°
July
252°
247°
255°
241°
August
248°
260°
201°
282°
September
128°
268°
229°
216°
October
251°
229°
211°
218°
November
234°
225°
235°
229°
December
228°
179°
214°
241°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.