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
92.2
94
90
95
98
82
February
96.3
99
88
97
99
98
March
98.9
97
98
100
99
98
April
99.1
97
99
100
99
May
99.6
100
100
100
100
June
99.8
100
100
100
100
July
99.8
100
100
100
100
August
99.2
100
99
98
98
September
98.4
98
98
100
99
October
99.3
99
99
99
99
November
98.6
95
100
99
100
December
94.9
95
93
91
95
Average
98.0
96.8
96.9
98.4
98.6
97.5
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
3.7
7
4
3
4
1
February
7.9
12
5
6
8
7
March
13.8
15
9
13
14
14
April
19.8
18
20
21
20
May
25.4
26
26
26
28
June
32.3
30
33
34
32
July
35.6
37
35
36
35
August
33.9
34
34
33
36
September
28.9
29
30
29
28
October
18.7
21
19
18
21
November
11.7
12
9
13
13
December
5.0
7
4
6
4
Average
18.7
11.0
19.3
19.7
20.0
19.9
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
-6.2
-3
-3
-8
-8
-7
February
-4.4
-1
-5
-6
-4
-6
March
1.2
2
-1
0
1
3
April
4.5
3
4
4
4
May
9.7
11
9
10
11
June
15.6
15
16
17
15
July
19.6
20
20
21
19
August
18.1
19
19
17
19
September
13.0
14
14
13
11
October
4.4
6
6
5
4
November
-2.6
-1
-2
0
-1
December
-6.5
-4
-5
-4
-8
Average
5.0
-1.4
6.3
6.0
6.0
5.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.4
8
11
5
3
6
February
5.8
4
13
4
6
2
March
6.0
10
10
3
1
9
April
2.7
6
2
3
3
May
3.1
3
2
2
1
June
1.3
1
2
1
1
July
1.0
0
2
1
1
August
0.9
1
2
2
0
September
2.4
1
5
3
5
October
4.0
2
6
6
2
November
1.9
3
4
1
2
December
6.4
9
15
13
4
Average
3.8
7.5
4.7
3.7
3.2
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
4.5
5
5
4
5
4
February
6.1
7
7
5
5
6
March
7.6
7
8
7
8
7
April
8.4
8
10
8
8
May
8.4
7
9
9
9
June
8.7
9
9
8
10
July
7.6
7
7
7
9
August
7.4
7
7
8
8
September
7.4
7
7
6
6
October
6.2
6
6
6
6
November
5.2
5
6
4
7
December
4.4
4
5
6
5
Average
6.9
6.3
6.6
7.0
6.9
7.1
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
354°
030°
031°
044°
322°
February
300°
224°
330°
323°
321°
March
235°
144°
356°
192°
188°
April
204°
265°
245°
277°
May
138°
251°
211°
234°
June
164°
189°
191°
216°
July
213°
156°
189°
177°
August
184°
185°
152°
184°
September
186°
160°
239°
192°
October
138°
155°
162°
230°
November
055°
185°
256°
190°
December
116°
325°
220°
080°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.