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
94.0
97
94
97
97
85
February
93.7
99
82
90
96
97
March
97.0
96
91
96
99
100
April
98.5
99
99
95
99
100
May
99.4
99
99
100
100
June
99.5
100
99
100
100
July
99.3
100
100
100
100
August
99.7
100
100
99
100
September
99.4
99
99
100
99
October
97.2
98
93
99
98
November
95.2
97
73
99
100
December
95.2
94
84
99
96
Average
97.5
97.3
96.2
94.3
98.9
97.9
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
3.7
6
4
4
4
1
February
6.9
9
4
6
6
7
March
12.3
12
8
12
12
13
April
18.1
19
17
19
19
18
May
23.3
23
24
24
26
June
29.8
27
30
31
30
July
32.4
34
32
33
32
August
31.1
31
31
31
33
September
26.8
26
28
27
27
October
17.9
19
17
17
21
November
11.2
11
8
13
12
December
4.8
6
4
7
3
Average
17.4
11.4
17.5
18.3
18.8
18.4
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
-7.0
-6
-5
-8
-7
-9
February
-6.9
-3
-8
-8
-5
-6
March
-1.4
0
-2
-2
-1
1
April
2.6
4
1
2
3
3
May
7.3
9
7
8
9
June
12.5
11
13
14
13
July
16.1
16
17
17
15
August
14.7
15
15
14
16
September
10.5
10
12
11
9
October
2.5
4
3
3
2
November
-3.3
-2
-5
-1
-1
December
-7.4
-5
-6
-5
-10
Average
3.1
-2.8
3.6
3.8
4.1
3.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.6
3
4
5
3
7
February
7.9
4
18
13
5
3
March
5.0
7
14
6
1
2
April
2.9
5
3
7
1
1
May
2.7
2
3
3
1
June
1.3
2
2
1
1
July
1.5
1
4
2
2
August
1.6
2
3
2
2
September
2.5
1
3
4
3
October
5.1
6
11
3
2
November
3.0
11
6
0
1
December
4.9
5
16
4
3
Average
3.6
4.7
5.4
5.9
2.3
2.1
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
4.2
5
5
4
3
4
February
5.7
7
6
5
5
5
March
6.8
7
7
7
7
7
April
7.7
7
8
10
8
7
May
7.7
7
9
8
9
June
7.5
8
7
7
9
July
6.1
6
6
6
6
August
6.0
6
6
6
7
September
6.3
6
6
6
5
October
5.8
6
6
6
6
November
4.8
5
6
4
5
December
4.2
4
4
6
4
Average
6.2
6.4
6.1
6.4
5.9
6.2
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
297°
285°
319°
233°
290°
February
261°
245°
244°
269°
312°
March
247°
252°
284°
267°
238°
April
251°
240°
258°
277°
275°
May
209°
253°
251°
265°
June
229°
239°
292°
246°
July
261°
226°
292°
264°
August
276°
267°
299°
267°
September
274°
307°
314°
315°
October
318°
302°
299°
303°
November
302°
268°
313°
275°
December
314°
002°
246°
279°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.