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
January
81.9
80
84
February
91.1
92
91
March
95.7
94
97
April
93.8
94
May
95.0
95
June
95.1
95
July
94.9
95
August
96.5
97
September
69.7
70
October
44.1
0
96
November
50.0
7
94
December
80.5
89
67
Average
84.8
88.8
77.2
88.4
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
January
9.8
7
13
February
15.7
16
15
March
17.9
19
17
April
22.0
22
May
27.7
28
June
31.2
31
July
32.2
32
August
32.1
32
September
20.1
20
October
10.9
0
23
November
8.9
2
16
December
13.1
14
12
Average
16.8
14.0
18.8
17.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
1.2
-2
5
February
5.1
5
5
March
8.2
9
8
April
11.4
12
May
16.5
17
June
20.1
20
July
23.2
23
August
22.2
22
September
11.9
12
October
5.0
0
11
November
2.6
0
6
December
3.9
3
5
Average
7.2
3.7
10.6
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
11.5
16
8
February
7.5
10
4
March
7.2
5
9
April
5.6
6
May
1.9
2
June
2.1
2
July
4.0
4
August
1.8
2
September
1.6
2
October
1.5
0
4
November
1.9
0
4
December
10.7
7
18
Average
6.9
10.2
3.6
6.8
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
January
7.4
7
8
February
8.7
9
9
March
8.3
8
9
April
7.3
7
May
6.2
6
June
5.3
5
July
5.4
5
August
5.2
5
September
3.7
4
October
3.2
0
7
November
3.5
1
6
December
7.2
7
7
Average
6.7
7.9
5.5
6.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
304°
243°
February
222°
224°
March
209°
261°
April
234°
May
178°
June
280°
July
228°
August
342°
September
032°
October
360°
203°
November
220°
274°
December
233°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.