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
94.2
87
90
100
96
93
February
97.4
100
94
96
98
100
March
97.4
98
96
94
95
99
April
99.3
100
99
97
100
100
May
99.6
100
100
100
100
June
99.7
100
100
100
100
July
99.9
100
100
100
100
August
99.8
100
100
100
100
September
98.9
99
98
99
99
October
99.6
100
100
100
99
November
98.2
94
100
99
98
December
95.3
90
96
99
97
Average
98.1
96.2
97.0
98.3
98.8
98.7
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
6.5
6
6
8
7
7
February
9.8
11
8
9
10
10
March
14.8
15
11
15
15
15
April
20.8
21
20
22
22
21
May
25.7
26
27
27
28
June
32.0
30
32
34
33
July
34.3
37
34
35
34
August
33.0
33
32
33
35
September
28.8
29
30
29
29
October
20.7
23
20
20
23
November
13.5
14
10
15
15
December
7.1
8
8
8
5
Average
19.8
13.3
20.5
21.0
21.0
21.2
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
-6.3
-5
-4
-7
-7
-6
February
-5.8
-2
-6
-7
-4
-5
March
-1.6
0
-1
-1
-1
1
April
3.0
3
2
3
4
3
May
7.3
8
8
8
8
June
12.9
10
14
15
14
July
17.7
17
19
19
17
August
16.1
17
17
16
17
September
11.7
11
14
12
10
October
3.7
4
5
5
3
November
-3.4
-2
-5
-1
-1
December
-6.3
-4
-5
-4
-10
Average
3.8
-2.8
4.5
5.0
5.2
4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.7
9
18
0
5
7
February
4.6
3
8
4
4
1
March
5.9
6
14
7
7
2
April
1.8
1
1
3
2
1
May
2.0
1
0
1
1
June
1.3
1
3
1
1
July
0.9
0
3
1
2
August
0.6
2
0
0
0
September
2.0
1
4
3
2
October
1.4
1
2
1
3
November
2.0
3
2
3
2
December
2.8
2
3
4
2
Average
2.8
4.5
4.0
2.5
2.5
1.8
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
6
8
6
8
7
February
8.1
9
8
7
8
8
March
8.6
9
9
10
8
8
April
9.8
9
10
11
10
10
May
8.7
8
11
9
8
June
8.1
8
9
8
10
July
7.0
8
7
7
8
August
6.9
7
6
7
7
September
6.8
6
6
6
7
October
7.8
7
7
8
8
November
7.1
6
9
7
7
December
6.8
7
8
7
7
Average
7.8
8.1
7.5
8.1
7.6
7.9
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
240°
290°
269°
267°
277°
February
269°
242°
253°
284°
286°
March
243°
257°
280°
252°
220°
April
264°
271°
271°
261°
279°
May
173°
254°
241°
264°
June
232°
215°
282°
238°
July
256°
128°
119°
268°
August
170°
134°
241°
231°
September
177°
146°
263°
237°
October
255°
263°
239°
265°
November
159°
253°
264°
176°
December
270°
260°
204°
292°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.