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
91.1
77
87
98
96
95
February
90.4
92
94
90
85
95
March
91.5
90
94
96
88
83
April
95.0
92
99
96
97
May
91.9
91
92
89
94
June
97.5
93
99
95
99
July
96.8
96
96
97
94
August
96.7
100
100
98
94
September
94.2
91
96
98
94
October
94.1
99
96
100
92
November
93.9
94
96
95
98
December
93.9
89
93
98
92
Average
93.3
86.3
93.3
95.9
94.6
93.9
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
9.1
3
10
11
10
11
February
11.3
15
14
11
5
10
March
17.5
19
16
18
18
18
April
21.7
23
24
21
22
May
26.4
26
29
24
27
June
32.3
29
33
32
36
July
33.9
31
37
33
35
August
33.2
34
35
35
34
September
30.5
31
33
33
29
October
22.2
23
24
25
22
November
15.8
17
14
18
18
December
11.4
12
11
17
9
Average
21.0
12.0
22.1
23.5
22.5
22.4
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
-6.9
-2
-5
-8
-4
-5
February
-6.7
-1
-7
-8
-9
-4
March
0.2
0
-1
-2
0
2
April
4.5
5
5
4
4
May
11.6
13
12
11
12
June
17.0
16
18
17
18
July
19.2
17
21
19
20
August
18.4
18
19
19
18
September
14.7
15
15
16
11
October
5.7
6
6
7
4
November
-1.2
-1
-2
0
1
December
-5.4
-3
-5
-3
-5
Average
5.4
-1.1
6.2
6.2
6.3
6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.6
14
16
6
1
3
February
8.4
6
2
12
24
5
March
4.8
7
4
7
10
4
April
3.3
5
0
2
2
May
3.9
5
5
6
2
June
1.5
3
3
1
1
July
1.2
1
3
2
1
August
1.0
1
0
1
1
September
2.8
6
2
0
4
October
3.7
0
1
4
4
November
3.6
7
8
3
1
December
4.8
11
1
0
8
Average
4.2
8.8
4.8
3.9
4.2
2.9
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
10.7
10
11
12
13
10
February
11.8
12
13
13
10
12
March
13.2
12
14
14
15
12
April
14.1
13
16
14
13
May
12.2
12
15
13
13
June
12.2
9
13
10
16
July
10.0
10
10
10
11
August
10.0
10
9
12
11
September
11.6
10
11
13
11
October
11.7
11
10
12
11
November
11.4
10
13
11
13
December
11.6
11
14
12
11
Average
11.7
11.3
11.1
12.4
11.9
11.9
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
319°
310°
335°
320°
328°
February
293°
294°
347°
043°
332°
March
299°
275°
330°
238°
186°
April
227°
248°
284°
299°
May
155°
181°
152°
101°
June
134°
177°
163°
196°
July
181°
159°
165°
146°
August
171°
172°
183°
156°
September
176°
180°
190°
206°
October
243°
219°
241°
351°
November
293°
264°
301°
220°
December
310°
270°
235°
319°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.