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
94.8
91
89
97
94
98
February
94.2
88
87
95
99
97
March
94.4
96
87
97
96
94
April
98.4
96
99
97
100
99
May
98.6
100
98
99
100
93
June
98.9
100
98
98
99
99
July
96.8
96
100
100
86
100
August
95.7
99
99
100
82
91
September
97.0
100
98
95
99
89
October
99.1
99
100
99
100
November
97.2
99
100
98
85
December
93.2
97
88
92
94
Average
96.6
96.3
95.9
97.4
95.4
94.9
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
7.5
8
4
8
8
10
February
9.8
10
8
11
11
13
March
13.7
13
10
17
14
15
April
19.5
19
19
19
21
20
May
24.0
24
24
23
26
25
June
30.8
33
27
31
35
30
July
36.4
37
36
37
38
36
August
34.3
33
32
36
34
36
September
29.0
30
27
31
31
31
October
20.5
20
23
19
24
November
12.3
12
9
14
12
December
6.6
10
4
7
7
Average
20.8
23.0
19.0
21.2
21.6
21.6
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
-5.0
-4
-5
-9
-6
-4
February
-6.6
-3
-7
-10
-4
-6
March
-3.5
-1
-4
-3
-5
-2
April
1.4
1
0
-1
1
2
May
5.7
5
6
4
6
5
June
10.8
12
10
10
14
10
July
14.3
16
15
14
14
13
August
12.5
11
14
14
10
14
September
7.5
7
8
10
7
7
October
0.2
2
1
2
0
November
-5.3
-5
-9
-2
-5
December
-7.8
-7
-7
-5
-7
Average
2.7
4.9
2.2
1.6
2.7
2.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.5
10
12
0
3
3
February
4.9
10
7
0
2
1
March
5.8
7
10
4
5
3
April
2.7
4
1
4
2
2
May
3.0
1
4
2
1
3
June
1.5
1
3
1
1
0
July
0.1
1
0
0
0
0
August
0.6
2
1
2
0
0
September
1.3
3
3
2
0
1
October
2.6
1
1
7
2
November
1.8
2
3
0
4
December
3.6
0
2
8
2
Average
2.7
3.8
3.5
1.6
2.4
1.6
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
4.5
4
6
3
5
6
February
6.6
6
8
5
7
6
March
6.8
8
9
5
7
7
April
7.4
7
7
9
7
7
May
6.9
7
6
8
7
6
June
6.7
7
7
7
6
7
July
5.3
5
5
6
5
5
August
5.0
5
5
5
5
5
September
5.1
5
5
5
5
4
October
4.7
4
4
4
4
November
4.1
4
5
4
4
December
3.8
4
5
5
4
Average
5.7
6.0
5.8
5.6
5.5
5.5
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
223°
050°
320°
019°
249°
February
225°
244°
301°
290°
328°
March
269°
238°
302°
303°
251°
April
279°
261°
261°
339°
303°
May
010°
335°
285°
325°
251°
June
279°
012°
251°
237°
249°
July
173°
192°
221°
195°
143°
August
222°
165°
183°
137°
134°
September
169°
127°
232°
192°
077°
October
316°
020°
198°
054°
November
294°
289°
330°
228°
December
183°
220°
211°
010°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.