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
97.4
97
100
99
100
February
98.1
100
96
100
100
99
March
98.3
100
98
99
94
99
April
99.9
100
100
100
100
May
99.8
100
100
100
100
June
99.8
100
100
100
100
July
99.7
100
100
99
100
August
99.7
100
99
100
100
September
99.7
99
100
100
100
October
99.6
100
100
99
100
November
98.8
99
99
99
100
December
97.6
97
99
98
Average
99.2
99.7
99.0
99.5
99.0
99.6
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
10.2
7
12
10
12
February
11.6
14
10
12
12
14
March
15.6
15
11
17
15
16
April
22.3
21
23
23
21
May
26.8
26
29
29
29
June
33.8
30
35
36
34
July
36.5
39
36
36
37
August
35.4
38
33
35
38
September
31.6
30
31
32
34
October
23.6
26
23
22
27
November
17.1
19
12
20
17
December
10.5
8
11
11
Average
22.0
14.6
23.6
23.0
23.4
24.1
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
-4.0
-2
-6
-7
-3
February
-4.1
0
-4
-8
-5
-5
March
0.0
1
0
-1
-1
1
April
2.8
2
2
3
3
May
5.8
7
6
5
6
June
10.5
8
12
14
10
July
15.6
16
18
15
13
August
15.1
19
17
12
15
September
10.9
11
13
11
10
October
3.3
5
4
5
2
November
-2.2
0
-5
0
-1
December
-5.5
-4
-2
-8
Average
3.8
0.5
5.9
4.2
4.1
3.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.7
12
0
2
1
February
5.4
7
7
2
1
1
March
6.3
4
15
2
8
10
April
1.3
0
0
2
1
May
1.9
1
0
0
1
June
0.3
1
0
1
0
July
1.4
0
2
1
1
August
1.2
4
2
1
1
September
1.4
5
3
0
0
October
1.1
0
1
4
0
November
1.9
1
3
0
1
December
3.1
2
5
2
Average
2.9
5.0
3.9
1.1
2.0
1.5
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
5.8
8
6
6
5
February
6.5
6
9
7
7
7
March
7.5
9
8
8
8
7
April
8.1
9
10
9
7
May
7.6
8
9
8
8
June
7.4
7
9
8
8
July
5.9
7
7
6
6
August
6.0
7
6
8
7
September
6.0
6
7
6
6
October
6.1
6
6
8
5
November
5.6
6
7
6
6
December
5.4
6
7
5
Average
6.7
7.8
7.4
7.5
7.2
6.5
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
133°
048°
084°
285°
February
198°
146°
305°
294°
312°
March
214°
197°
254°
196°
193°
April
249°
245°
259°
272°
May
149°
253°
230°
220°
June
200°
196°
225°
233°
July
215°
158°
149°
217°
August
155°
133°
209°
229°
September
138°
142°
214°
275°
October
171°
131°
146°
280°
November
180°
165°
127°
147°
December
163°
176°
113°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.