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
77.6
72
64
79
85
84
February
85.0
93
88
81
89
83
March
86.8
81
84
86
96
87
April
92.0
94
92
96
88
May
93.7
95
92
93
95
June
93.1
84
91
97
97
July
96.3
94
96
92
98
August
95.4
92
96
96
97
September
93.4
94
87
96
95
October
91.9
89
93
91
90
November
89.3
93
79
95
94
December
79.9
83
60
87
80
Average
89.2
81.7
87.9
87.5
92.9
91.2
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
3.4
2
7
1
3
6
February
6.8
9
11
5
1
5
March
10.6
12
10
13
15
13
April
16.8
19
15
18
15
May
22.9
23
24
22
21
June
27.0
25
28
28
28
July
29.6
29
30
28
32
August
28.4
26
29
30
29
September
25.4
24
24
26
25
October
18.9
17
18
22
17
November
10.5
11
13
11
14
December
6.4
8
6
10
5
Average
16.1
7.6
17.4
17.5
17.6
17.5
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
-4.5
-3
1
-8
-2
-1
February
-3.5
-2
-1
-5
-6
-2
March
0.9
2
1
2
2
4
April
5.7
7
6
6
4
May
11.9
10
14
10
11
June
16.6
13
17
19
17
July
19.0
18
19
20
19
August
18.1
17
19
20
19
September
15.3
14
15
16
15
October
9.5
8
7
13
9
November
2.0
1
4
1
5
December
-1.5
2
1
1
-1
Average
6.7
-1.1
7.6
7.8
8.3
8.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
21.1
30
24
22
12
20
February
14.6
7
13
23
12
13
March
15.6
19
21
22
5
10
April
11.2
13
13
7
14
May
9.8
10
8
11
13
June
5.0
6
4
6
4
July
3.6
4
4
7
1
August
3.8
6
2
4
4
September
5.9
3
11
7
2
October
8.5
11
7
6
6
November
11.1
9
16
6
10
December
13.0
17
7
9
12
Average
10.8
18.8
10.9
11.1
7.4
8.7
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
8.2
8
7
8
7
8
February
8.9
9
10
10
8
9
March
9.1
9
10
10
9
8
April
8.4
8
9
8
8
May
7.2
7
7
6
8
June
7.2
7
7
8
7
July
6.5
6
7
7
7
August
6.3
7
6
6
6
September
6.4
5
7
8
7
October
7.5
7
8
7
7
November
8.4
8
9
8
9
December
7.6
7
7
8
9
Average
7.7
8.6
7.3
7.9
7.4
7.5
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
246°
241°
264°
263°
245°
February
249°
244°
244°
280°
261°
March
258°
268°
254°
260°
244°
April
247°
249°
267°
277°
May
314°
198°
306°
265°
June
310°
272°
227°
264°
July
248°
252°
283°
274°
August
270°
245°
252°
253°
September
317°
270°
226°
224°
October
249°
237°
225°
242°
November
241°
237°
239°
240°
December
231°
235°
227°
242°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.