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
90.5
94
76
88
90
99
February
86.9
87
88
84
91
87
March
88.0
82
87
90
89
80
April
89.9
90
88
97
87
91
May
87.3
89
91
79
91
June
95.9
89
98
99
100
July
94.5
87
97
94
97
August
96.7
97
99
97
98
September
93.5
97
89
98
93
October
91.3
91
98
94
89
November
90.3
88
90
97
96
December
92.5
88
96
98
94
Average
91.2
88.1
88.9
93.0
92.6
92.8
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
4.3
3
1
5
5
5
February
4.4
7
5
3
0
4
March
9.1
10
6
10
8
10
April
13.8
15
13
15
13
14
May
17.9
19
19
17
20
June
25.6
22
27
28
27
July
29.5
28
31
30
30
August
28.4
28
29
29
31
September
25.1
25
26
26
24
October
15.2
16
17
17
15
November
10.1
11
7
13
12
December
5.7
7
4
8
6
Average
14.9
8.4
15.1
16.3
16.1
16.4
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
-7.4
-9
-7
-7
-6
-5
February
-8.4
-4
-7
-9
-11
-8
March
-4.6
-3
-6
-4
-4
-2
April
-1.4
-1
-1
-1
-1
-2
May
5.2
7
5
5
6
June
10.6
11
12
12
11
July
14.0
13
16
14
14
August
13.2
14
15
12
15
September
9.3
10
10
9
8
October
1.3
2
3
4
0
November
-3.3
-2
-7
0
-2
December
-6.9
-3
-6
-4
-6
Average
1.5
-5.9
2.6
2.4
2.5
2.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.9
10
17
13
6
2
February
10.8
11
14
14
8
15
March
8.5
12
11
15
4
9
April
8.5
10
13
3
8
9
May
9.0
5
9
12
4
June
2.7
6
3
1
3
July
2.6
2
3
1
3
August
2.1
4
3
2
1
September
2.5
2
5
1
3
October
4.3
5
2
3
3
November
5.7
9
8
3
1
December
5.2
4
8
3
6
Average
6.2
10.7
7.3
6.8
4.1
4.8
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
11.9
11
9
12
13
14
February
13.3
12
15
12
14
13
March
12.5
11
14
12
11
13
April
12.6
13
11
17
12
12
May
10.3
9
12
10
11
June
9.6
9
10
9
11
July
8.3
8
8
8
9
August
8.9
9
9
9
9
September
9.4
9
9
10
10
October
11.4
10
10
11
12
November
12.2
11
11
13
13
December
13.5
13
16
15
13
Average
11.1
11.9
10.3
11.3
10.9
11.5
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
291°
293°
298°
287°
285°
February
281°
285°
283°
273°
291°
March
257°
266°
317°
283°
268°
April
302°
300°
283°
322°
292°
May
177°
271°
212°
244°
June
170°
242°
323°
263°
July
287°
286°
110°
257°
August
273°
274°
251°
275°
September
277°
236°
287°
293°
October
305°
295°
289°
283°
November
280°
277°
279°
261°
December
294°
283°
264°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.