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
92.7
86
87
98
89
95
February
91.2
98
91
94
87
94
March
95.7
90
98
97
96
92
April
96.9
95
98
96
95
100
May
96.7
96
98
93
June
96.5
98
97
100
99
July
94.5
94
94
92
93
August
95.6
97
95
95
98
September
97.6
100
96
95
99
October
96.1
100
98
93
97
November
93.6
96
93
98
94
December
89.0
89
85
91
91
Average
94.6
92.5
95.7
95.2
93.2
95.0
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
13.1
12
14
13
13
14
February
17.5
19
18
17
15
15
March
20.4
21
21
21
21
22
April
23.8
25
23
21
22
14
May
25.9
26
4
28
June
25.4
30
0
30
30
July
31.0
32
26
29
33
August
29.6
33
31
30
32
September
26.6
30
29
28
28
October
24.4
25
24
24
25
November
18.0
19
19
17
20
December
14.9
15
16
19
14
Average
22.0
19.0
24.2
19.0
22.0
23.7
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
2.1
1
3
0
3
5
February
5.4
4
5
3
3
5
March
7.7
8
7
7
7
12
April
9.9
11
10
7
7
5
May
14.2
14
-1
15
June
15.9
16
0
21
19
July
20.2
20
16
19
22
August
18.8
20
21
20
21
September
15.1
16
16
16
17
October
11.4
11
7
12
13
November
4.9
5
7
3
7
December
4.1
3
8
6
1
Average
10.2
6.3
11.1
7.9
10.0
12.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.5
5
8
7
8
12
February
9.0
8
7
9
9
18
March
6.6
6
8
4
9
15
April
4.0
5
5
4
2
0
May
5.0
4
7
9
June
4.4
2
2
9
4
July
1.9
2
1
5
1
August
4.0
2
4
5
3
September
3.5
1
3
9
5
October
5.2
2
2
4
7
November
5.5
7
5
2
5
December
9.7
3
13
5
7
Average
5.4
6.0
3.8
4.2
5.8
7.2
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
4.8
6
5
5
2
5
February
5.0
7
6
5
1
6
March
5.7
6
5
6
4
5
April
5.5
7
6
6
4
6
May
4.3
5
5
3
June
3.6
4
3
4
3
July
3.0
3
4
3
2
August
2.9
3
3
3
3
September
3.2
3
4
3
3
October
4.3
5
5
4
3
November
4.1
4
5
4
4
December
4.2
5
5
4
3
Average
4.4
6.4
4.4
4.5
3.3
3.6
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
288°
256°
309°
277°
334°
February
248°
223°
234°
304°
272°
March
349°
262°
245°
180°
230°
April
232°
301°
275°
268°
352°
May
049°
196°
136°
June
268°
342°
130°
201°
July
283°
226°
234°
238°
August
301°
205°
147°
251°
September
033°
041°
349°
070°
October
308°
347°
250°
090°
November
058°
021°
336°
023°
December
265°
226°
215°
289°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.