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
70.7
86
91
0
94
96
February
67.9
87
89
0
76
93
March
73.7
87
81
0
96
94
April
69.1
92
0
89
89
May
73.2
99
0
89
95
June
75.3
98
0
100
97
July
86.6
100
31
100
100
August
98.3
97
100
97
100
September
94.1
90
98
100
100
October
76.2
85
92
0
86
November
72.2
96
88
0
94
December
70.4
97
87
0
91
Average
79.3
86.6
93.1
36.5
72.2
94.7
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
2.7
0
3
4
5
2
February
1.5
3
3
3
-6
5
March
5.9
5
2
9
11
6
April
10.8
12
9
12
11
May
17.5
21
17
17
18
June
23.3
22
23
27
23
July
28.6
29
28
32
27
August
28.5
28
31
27
30
September
23.2
23
28
25
23
October
9.7
13
16
0
8
November
5.1
10
2
0
9
December
2.6
9
-5
-2
5
Average
11.9
2.9
14.5
14.0
11.9
13.6
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
-8.2
-12
-5
-9
-3
-8
February
-9.4
-6
-7
-10
-15
-6
March
-5.1
-5
-7
-4
-2
-5
April
-1.0
0
-3
-1
-2
May
4.9
8
4
4
5
June
9.9
12
9
12
10
July
12.4
13
12
16
10
August
12.7
13
15
12
12
September
9.0
9
12
9
9
October
0.0
1
5
0
-3
November
-4.6
-2
-8
0
-2
December
-8.6
-3
-15
-10
-4
Average
0.1
-8.2
2.5
0.9
1.5
1.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.6
14
15
0
14
12
February
16.6
19
16
0
38
14
March
10.5
14
19
0
6
17
April
13.3
15
0
23
16
May
7.3
5
0
11
6
June
5.4
7
0
1
13
July
1.3
1
1
2
2
August
4.1
7
1
7
0
September
6.9
8
5
0
2
October
13.8
13
11
0
28
November
12.6
8
22
0
9
December
8.1
5
24
0
7
Average
9.8
15.5
9.6
3.9
8.1
10.2
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
10.9
9
10
13
13
11
February
11.5
10
12
14
10
12
March
9.2
8
8
12
9
11
April
10.9
10
13
11
11
May
9.1
7
11
10
10
June
8.4
6
10
9
9
July
7.0
7
7
7
8
August
8.3
9
9
9
8
September
9.2
8
9
9
10
October
10.6
8
10
12
12
November
11.6
9
12
14
13
December
9.7
10
10
10
8
Average
9.5
8.9
8.5
10.6
10.0
10.1
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
272°
278°
273°
277°
279°
February
272°
274°
288°
294°
271°
March
343°
353°
300°
277°
287°
April
275°
295°
296°
307°
May
052°
286°
308°
286°
June
152°
272°
311°
294°
July
285°
273°
008°
280°
August
275°
302°
301°
298°
September
268°
302°
285°
300°
October
297°
286°
270°
283°
November
260°
278°
270°
266°
December
259°
295°
276°
266°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.