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
90.0
89
80
97
97
83
February
92.7
94
89
88
93
94
March
93.6
92
84
93
98
96
April
96.3
92
97
99
98
May
99.0
100
96
99
100
June
99.7
100
100
100
100
July
99.5
100
100
99
100
August
98.6
100
99
96
96
September
99.0
99
99
100
98
October
97.0
99
94
98
97
November
98.3
100
97
100
100
December
92.4
91
86
88
94
Average
96.0
91.5
94.4
95.8
97.4
96.3
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
2.3
4
1
1
3
1
February
5.6
9
3
4
5
4
March
11.8
12
7
11
12
13
April
18.0
16
18
19
18
May
23.8
24
24
24
26
June
30.4
27
31
32
31
July
34.0
35
34
34
34
August
32.5
32
32
32
35
September
28.1
27
29
29
28
October
18.1
19
18
17
21
November
10.8
11
8
13
12
December
3.7
5
2
5
3
Average
17.1
8.3
17.3
18.2
18.8
18.8
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
-9.8
-6
-7
-11
-9
-9
February
-7.6
-4
-10
-10
-6
-8
March
-2.5
-1
-3
-3
-2
0
April
1.4
0
1
2
1
May
6.0
7
5
7
7
June
10.9
9
11
12
12
July
14.9
14
15
17
14
August
13.4
14
14
13
14
September
8.9
8
9
9
7
October
1.2
3
2
3
0
November
-4.4
-4
-5
-1
-2
December
-8.3
-6
-8
-6
-10
Average
1.7
-4.2
2.1
1.9
3.1
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
10.7
14
25
4
3
11
February
8.9
9
13
11
8
9
March
9.5
15
23
5
5
8
April
5.1
11
6
2
5
May
4.4
2
8
6
2
June
2.6
6
2
1
1
July
1.9
0
4
1
2
August
1.4
1
1
3
1
September
3.3
2
7
3
3
October
5.1
5
7
5
3
November
3.8
3
6
4
3
December
8.3
9
13
19
7
Average
6.0
12.6
8.3
5.7
4.8
4.2
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
3.1
4
4
2
3
2
February
4.9
6
6
3
5
4
March
5.9
6
6
6
6
6
April
7.2
7
8
7
7
May
7.0
6
8
7
8
June
6.6
6
7
5
8
July
5.3
6
5
5
6
August
5.4
5
5
6
6
September
5.8
6
4
6
5
October
5.1
5
4
4
6
November
3.9
4
5
3
4
December
2.8
3
4
3
3
Average
5.3
5.2
5.2
5.2
5.0
5.6
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
285°
269°
240°
244°
257°
February
271°
255°
237°
266°
289°
March
267°
255°
283°
270°
267°
April
257°
266°
266°
279°
May
273°
265°
261°
277°
June
252°
267°
285°
252°
July
296°
310°
316°
284°
August
296°
294°
284°
291°
September
274°
280°
279°
286°
October
273°
267°
271°
273°
November
275°
256°
284°
271°
December
275°
289°
258°
272°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.