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
81.6
76
80
90
79
83
February
88.5
80
86
93
91
94
March
82.1
82
67
87
90
83
April
88.8
95
76
94
91
May
88.3
87
91
83
93
June
95.8
93
93
100
97
July
96.6
94
99
95
100
August
95.6
94
97
95
97
September
92.9
90
97
98
96
October
85.6
82
93
82
86
November
89.2
98
80
97
95
December
81.5
91
64
86
88
Average
86.6
79.8
88.2
89.5
90.9
92.2
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
-1.9
-2
0
0
2
0
February
0.5
5
1
0
-6
2
March
6.2
6
-1
8
11
8
April
11.7
12
10
14
11
May
19.4
23
18
19
19
June
26.2
26
24
29
26
July
29.5
28
29
32
29
August
29.6
28
31
30
30
September
24.3
24
26
27
23
October
12.5
12
16
16
10
November
6.5
9
2
10
9
December
1.8
6
-6
1
5
Average
11.3
2.8
13.9
13.8
15.4
14.6
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
-10.1
-12
-9
-12
-7
-10
February
-11.7
-5
-10
-13
-16
-8
March
-6.0
-7
-10
-6
-3
-4
April
-2.1
-1
-3
0
-3
May
6.0
8
5
5
6
June
12.3
13
11
13
12
July
14.7
14
15
17
14
August
13.9
14
15
14
14
September
9.4
11
10
10
8
October
1.0
1
3
4
-1
November
-5.4
-3
-8
-3
-4
December
-9.3
-5
-14
-11
-7
Average
-1.3
-8.0
1.8
0.8
1.9
1.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.3
6
5
6
2
3
February
6.9
6
9
6
8
7
March
5.4
6
12
5
1
4
April
8.4
4
15
6
9
May
3.8
4
5
4
3
June
2.1
5
2
1
1
July
0.6
1
0
1
1
August
1.9
3
1
2
1
September
2.2
1
0
3
1
October
6.4
9
2
5
6
November
4.2
1
11
2
3
December
8.2
3
26
11
3
Average
4.9
5.7
4.5
5.5
3.4
3.2
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
12.6
12
10
16
13
12
February
13.6
13
13
16
13
12
March
13.0
12
12
15
14
12
April
14.4
14
17
13
14
May
12.3
10
13
12
14
June
11.4
9
12
12
12
July
9.9
10
10
11
10
August
10.1
10
9
11
10
September
11.2
10
11
10
12
October
13.5
12
13
13
14
November
13.3
12
15
14
13
December
12.3
13
12
13
13
Average
12.4
12.4
11.2
13.2
12.2
12.3
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°
281°
292°
292°
286°
February
289°
289°
298°
294°
279°
March
326°
044°
305°
290°
294°
April
310°
330°
320°
310°
May
128°
300°
134°
188°
June
112°
265°
014°
284°
July
334°
297°
131°
155°
August
313°
114°
277°
076°
September
146°
329°
288°
294°
October
311°
309°
318°
290°
November
293°
289°
292°
270°
December
290°
308°
265°
289°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.