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
92.7
88
88
97
91
98
February
88.1
91
96
98
84
80
March
87.9
92
82
88
92
79
April
95.3
93
98
100
95
94
May
89.5
92
93
90
94
June
97.6
96
98
97
99
July
91.6
91
96
98
78
August
95.6
96
95
98
99
September
92.9
95
94
98
97
October
91.8
91
100
98
94
November
94.9
97
96
99
99
December
94.1
94
93
100
92
Average
92.4
91.2
92.9
95.6
95.0
91.6
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
6.6
5
2
8
7
9
February
7.7
13
8
8
3
10
March
13.9
15
11
14
15
14
April
19.5
21
20
20
18
20
May
23.5
24
25
22
27
June
31.2
28
33
31
35
July
33.8
32
36
34
34
August
32.3
33
34
34
33
September
29.3
31
31
31
28
October
19.7
20
22
22
19
November
14.0
16
12
17
17
December
9.1
10
7
12
9
Average
19.0
13.5
19.5
20.5
20.6
20.9
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
-7
-8
-6
-6
February
-7.0
-3
-7
-8
-10
-6
March
-3.8
-2
-4
-3
-1
0
April
1.2
3
1
1
1
0
May
8.1
10
7
9
10
June
13.4
14
14
14
15
July
17.0
16
19
17
17
August
15.3
15
19
16
16
September
9.9
11
11
11
9
October
1.8
3
3
3
1
November
-3.2
-3
-6
-1
-1
December
-6.2
-4
-9
-6
-5
Average
2.4
-3.2
3.5
2.8
4.0
3.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.8
5
5
6
6
1
February
7.8
3
4
3
14
7
March
5.1
4
6
11
3
4
April
3.3
6
1
0
3
4
May
4.7
5
4
6
1
June
2.0
5
2
1
3
July
0.6
2
2
1
0
August
0.8
0
5
0
1
September
1.5
1
2
1
3
October
3.4
2
1
0
2
November
3.7
7
4
2
1
December
3.6
5
3
0
7
Average
3.4
4.4
3.5
3.4
2.7
2.7
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
8.7
9
8
10
10
10
February
9.3
9
11
10
8
11
March
10.0
9
10
11
10
9
April
11.8
12
11
16
11
11
May
9.6
9
10
10
10
June
8.7
8
9
8
11
July
8.1
7
8
8
9
August
7.8
8
8
8
8
September
8.1
7
8
9
8
October
9.1
9
9
10
9
November
9.2
9
9
9
9
December
9.1
10
10
8
10
Average
9.2
9.9
8.8
10.0
9.1
9.6
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
339°
014°
311°
330°
320°
February
318°
350°
314°
357°
330°
March
005°
010°
345°
014°
356°
April
331°
321°
323°
348°
338°
May
108°
279°
111°
060°
June
125°
182°
112°
332°
July
070°
133°
127°
136°
August
288°
152°
112°
107°
September
332°
112°
348°
355°
October
337°
325°
332°
338°
November
326°
323°
319°
285°
December
321°
312°
285°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.