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
93.8
86
93
96
95
97
February
93.1
92
93
97
82
91
March
94.0
92
98
99
98
88
April
95.4
96
100
91
98
May
96.8
98
97
91
98
June
97.0
95
95
95
100
July
98.9
99
99
96
100
August
97.9
100
95
98
100
September
94.0
98
98
97
94
October
90.9
93
92
98
91
November
91.0
88
93
95
90
December
94.7
87
96
98
98
Average
94.4
89.8
95.2
96.4
94.7
95.5
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
11.5
11
12
13
9
12
February
14.3
16
14
12
11
13
March
19.0
19
18
19
19
19
April
23.3
23
26
22
23
May
28.3
27
31
26
30
June
32.7
31
33
32
34
July
33.7
36
35
30
35
August
32.2
35
31
30
35
September
29.1
31
30
30
28
October
22.0
23
21
25
23
November
16.9
18
14
19
18
December
13.3
14
13
17
12
Average
22.1
15.0
23.4
23.3
22.7
23.7
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
-3.3
-4
-2
-5
-2
-1
February
-2.3
1
-2
-6
-5
-2
March
2.8
4
2
0
2
5
April
6.0
5
7
5
6
May
11.3
12
10
12
12
June
16.5
16
18
18
17
July
18.2
18
20
16
20
August
18.0
19
19
17
19
September
14.3
16
15
15
12
October
7.7
8
9
8
7
November
2.2
3
1
3
4
December
-2.7
0
-1
1
-2
Average
6.8
0.3
7.9
7.5
7.5
8.2
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
11
7
3
1
3
February
4.6
8
5
5
8
6
March
3.3
7
1
4
4
4
April
1.8
3
0
2
1
May
1.9
8
0
4
0
June
1.5
1
0
8
0
July
0.9
1
2
1
0
August
2.5
1
7
4
1
September
1.2
1
0
2
0
October
5.7
1
16
1
6
November
2.6
5
5
0
3
December
2.5
6
3
0
3
Average
3.2
8.6
3.1
3.8
2.8
2.0
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
11.3
10
12
11
11
11
February
12.9
13
15
12
11
11
March
12.2
13
13
13
13
12
April
12.6
13
14
12
11
May
11.1
10
13
12
11
June
10.0
8
11
10
11
July
8.1
8
8
7
8
August
7.9
9
7
8
8
September
8.8
7
9
10
9
October
10.2
9
9
11
12
November
11.6
10
12
11
12
December
11.3
11
11
13
12
Average
10.8
12.1
10.2
10.8
10.5
10.6
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
274°
265°
289°
329°
268°
February
266°
264°
304°
257°
254°
March
272°
254°
295°
251°
226°
April
251°
245°
247°
249°
May
161°
241°
152°
225°
June
210°
177°
188°
191°
July
181°
181°
173°
173°
August
180°
140°
206°
179°
September
218°
200°
211°
339°
October
220°
227°
256°
259°
November
273°
263°
274°
248°
December
282°
254°
261°
327°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.