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
96.7
88
98
100
97
98
February
95.8
94
85
99
98
99
March
95.5
95
94
98
99
98
April
97.0
98
98
99
100
May
98.8
99
97
99
100
June
99.6
100
98
100
100
July
95.4
74
100
96
100
August
95.3
97
98
90
91
September
96.4
97
99
99
89
October
90.3
99
83
99
92
November
96.9
98
89
100
96
December
92.4
99
87
90
98
Average
95.6
92.2
95.0
96.0
97.1
96.5
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
7.1
7
5
8
7
9
February
9.2
10
4
11
9
11
March
12.6
13
9
15
13
14
April
18.4
18
18
20
20
May
23.2
24
22
24
25
June
30.1
27
31
35
29
July
35.0
28
37
38
35
August
34.5
33
36
34
36
September
28.6
27
31
30
31
October
20.1
21
22
19
23
November
12.3
12
8
14
12
December
6.2
10
4
5
6
Average
18.9
10.0
19.4
21.0
20.7
20.8
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
-4.6
-3
-1
-6
-4
-2
February
-5.7
-2
-4
-8
-3
-7
March
-2.0
-1
-3
-2
-4
-3
April
0.8
0
-1
-1
1
May
4.8
6
4
5
6
June
9.3
8
9
13
10
July
13.5
9
14
16
13
August
11.8
12
13
11
14
September
5.9
6
8
5
6
October
-1.1
2
-1
2
-1
November
-4.3
-4
-5
-2
-3
December
-6.2
-5
-6
-6
-7
Average
1.8
-2.3
2.8
2.1
2.8
2.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
18
11
0
2
4
February
7.9
14
21
2
6
1
March
7.3
10
13
4
4
2
April
4.5
4
6
2
3
May
5.1
5
5
4
4
June
3.1
1
4
0
2
July
0.5
0
2
1
0
August
0.9
1
2
0
0
September
1.5
3
2
1
1
October
2.9
5
0
11
0
November
5.1
6
8
2
5
December
6.4
1
15
13
3
Average
5.0
13.4
4.6
3.5
3.6
2.2
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
7.0
7
9
6
7
8
February
7.7
7
11
6
8
8
March
7.6
9
10
6
8
7
April
8.1
8
9
8
7
May
7.1
6
8
8
7
June
7.0
7
7
7
8
July
5.9
5
6
6
6
August
5.9
5
6
6
6
September
5.6
5
5
6
6
October
5.8
6
4
7
5
November
5.7
5
7
5
6
December
5.7
6
6
7
6
Average
6.7
7.5
6.4
6.4
6.7
6.7
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
183°
184°
040°
134°
233°
February
222°
214°
328°
247°
336°
March
256°
220°
288°
279°
252°
April
259°
257°
321°
304°
May
267°
268°
313°
275°
June
337°
259°
299°
271°
July
248°
291°
253°
280°
August
260°
223°
289°
288°
September
317°
244°
293°
019°
October
319°
023°
223°
326°
November
303°
228°
328°
204°
December
063°
188°
197°
070°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.