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
82.3
76
48
91
93
95
February
83.7
85
88
96
79
91
March
84.7
88
74
86
90
80
April
92.6
94
96
97
92
94
May
87.5
86
89
90
88
June
96.6
93
98
97
99
July
92.5
86
92
95
95
August
93.7
94
96
96
99
September
90.0
96
92
97
96
October
88.2
89
83
96
90
November
81.9
92
27
98
96
December
82.4
85
0
99
88
Average
88.2
86.1
86.0
83.3
93.5
92.6
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
5.6
2
0
7
6
9
February
7.4
12
7
7
2
8
March
13.6
15
10
13
14
14
April
19.1
21
20
20
18
20
May
22.9
24
25
21
24
June
30.3
27
32
31
34
July
32.4
31
35
32
33
August
31.2
32
33
34
32
September
28.3
30
30
31
28
October
18.7
20
19
21
18
November
13.0
15
6
17
17
December
7.8
9
0
13
8
Average
18.4
12.3
18.6
19.4
19.9
20.2
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
-8.8
-9
-6
-8
-7
-7
February
-7.1
-3
-6
-9
-11
-6
March
-3.6
-2
-5
-4
-1
0
April
1.8
4
2
1
1
1
May
8.7
10
8
9
8
June
14.9
14
15
15
16
July
17.1
17
19
17
18
August
15.7
16
16
16
17
September
11.6
12
12
13
10
October
3.1
4
4
4
1
November
-2.3
-2
-1
0
-1
December
-5.1
-4
0
-5
-6
Average
3.3
-3.4
4.3
4.7
4.2
4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
9
0
9
6
1
February
7.0
1
12
5
12
7
March
6.2
3
10
11
5
5
April
4.0
4
2
0
2
2
May
4.3
2
7
7
2
June
1.5
4
1
0
3
July
0.8
1
1
2
1
August
0.7
1
0
1
1
September
1.4
1
0
1
3
October
3.6
4
0
0
3
November
3.1
7
0
1
0
December
4.6
12
0
1
9
Average
3.5
4.1
4.3
3.0
2.8
2.8
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
10.2
10
7
11
11
11
February
11.5
11
12
11
10
13
March
12.2
11
12
13
12
11
April
13.8
14
13
18
13
12
May
11.1
11
12
11
11
June
10.8
10
12
10
13
July
9.5
8
10
10
11
August
9.4
10
9
10
10
September
9.8
9
9
10
10
October
10.6
10
9
11
11
November
10.0
10
3
11
12
December
10.5
12
0
11
12
Average
10.9
11.5
10.3
10.4
11.0
11.2
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
331°
330°
297°
330°
309°
February
305°
302°
319°
218°
320°
March
359°
352°
342°
358°
196°
April
332°
305°
310°
341°
340°
May
136°
135°
143°
093°
June
144°
185°
161°
193°
July
132°
156°
157°
153°
August
201°
144°
164°
157°
September
182°
153°
193°
356°
October
318°
294°
333°
329°
November
315°
269°
305°
245°
December
321°
360°
242°
313°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.