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
78.7
66
57
93
77
82
February
88.7
94
88
93
87
96
March
88.6
90
78
87
92
88
April
88.7
86
87
90
95
May
95.4
94
96
96
96
June
96.9
91
99
99
99
July
96.6
97
94
95
99
August
95.0
96
92
98
97
September
91.4
92
90
94
97
October
91.7
89
98
90
92
November
91.4
99
83
98
94
December
80.8
74
77
83
84
Average
90.0
83.6
87.5
91.4
92.0
93.7
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
-5.5
-4
-4
-7
-3
-4
February
-3.6
4
-2
-4
-8
-2
March
4.5
7
1
3
9
6
April
11.0
10
8
13
13
May
20.9
24
21
21
19
June
27.2
28
28
30
28
July
27.9
28
28
29
28
August
26.0
27
26
28
27
September
22.7
24
23
24
21
October
13.3
14
16
17
10
November
4.8
8
5
7
8
December
-1.3
4
-2
0
0
Average
11.2
2.4
13.6
12.5
13.8
12.7
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
-13.8
-10
-11
-18
-10
-11
February
-13.2
-5
-13
-17
-17
-12
March
-5.6
-3
-8
-5
-1
-2
April
1.1
1
0
3
1
May
9.4
10
9
8
9
June
15.9
15
15
18
16
July
17.0
14
17
17
18
August
15.8
15
15
17
16
September
11.9
13
11
10
10
October
4.3
5
4
7
2
November
-4.7
-2
-4
-3
-1
December
-9.5
-3
-9
-10
-9
Average
1.7
-7.9
3.1
1.8
3.3
3.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.9
8
19
8
10
14
February
9.3
5
13
6
9
4
March
10.2
12
19
4
13
8
April
11.5
18
12
11
6
May
6.5
3
6
7
8
June
4.2
2
3
3
3
July
3.8
2
3
3
3
August
2.6
2
2
2
3
September
4.9
4
3
2
6
October
7.8
8
4
6
8
November
7.1
1
19
2
6
December
11.7
12
24
13
6
Average
7.5
8.2
8.0
6.9
6.5
5.9
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
4.8
7
7
8
0
0
February
4.9
8
8
10
0
0
March
5.2
10
9
9
0
0
April
5.1
10
12
0
0
May
4.2
8
9
0
0
June
4.3
6
9
0
0
July
3.6
6
7
0
0
August
3.7
6
6
3
0
September
4.7
6
7
7
0
October
5.3
8
8
7
0
November
5.8
8
9
9
0
December
4.7
7
8
8
0
Average
4.9
8.4
7.3
8.5
2.5
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
281°
306°
275°
360°
360°
February
263°
293°
298°
360°
360°
March
335°
008°
336°
360°
360°
April
316°
257°
360°
360°
May
113°
186°
360°
360°
June
081°
231°
360°
360°
July
273°
272°
360°
360°
August
242°
208°
303°
360°
September
142°
216°
249°
360°
October
309°
251°
116°
360°
November
249°
261°
280°
360°
December
238°
123°
263°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.