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
94.3
88
93
97
93
97
February
94.4
95
97
97
86
92
March
94.7
97
99
99
95
91
April
96.5
98
100
95
97
May
95.6
97
98
91
96
June
97.4
97
92
97
100
July
99.1
98
100
97
100
August
98.2
100
98
99
100
September
95.8
98
99
100
97
October
92.4
96
95
97
88
November
94.1
94
98
98
90
December
95.5
91
99
100
98
Average
95.5
93.5
96.3
97.6
95.6
95.4
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
12.8
10
13
14
12
13
February
15.2
18
16
13
11
13
March
20.0
20
19
20
20
20
April
24.1
25
27
23
24
May
29.2
28
32
28
31
June
33.9
31
35
33
35
July
35.0
36
37
32
37
August
33.8
36
32
33
36
September
30.6
32
32
32
30
October
23.7
25
23
26
25
November
18.1
19
15
20
20
December
14.3
15
14
19
13
Average
23.3
16.0
24.6
24.9
24.0
24.7
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
-4.3
-4
-2
-6
-3
-2
February
-3.3
1
-2
-7
-7
-3
March
2.1
3
2
0
2
4
April
5.1
5
7
5
5
May
11.6
13
12
13
12
June
17.1
16
18
18
19
July
19.6
20
21
19
21
August
18.9
20
19
19
19
September
14.8
16
16
15
12
October
7.7
8
9
8
5
November
1.8
2
1
2
3
December
-3.8
-1
-1
0
-4
Average
6.6
-1.5
8.2
7.7
7.6
7.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.8
6
5
2
2
3
February
3.4
4
1
3
13
3
March
2.3
2
1
1
5
3
April
1.6
1
0
1
1
May
1.5
4
0
2
1
June
1.5
3
0
5
0
July
1.0
1
1
2
0
August
1.7
1
5
2
1
September
1.5
0
1
0
1
October
3.8
1
7
1
4
November
0.8
2
2
0
1
December
2.0
6
0
0
3
Average
2.2
4.2
2.2
1.6
2.7
1.7
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
10.0
10
12
11
11
11
February
11.9
12
14
12
9
10
March
11.7
11
12
12
13
11
April
12.5
12
14
12
11
May
8.9
8
1
11
10
June
8.2
7
1
9
10
July
6.9
9
8
7
0
August
7.8
8
7
9
5
September
9.0
8
9
10
9
October
9.9
10
9
11
11
November
9.5
10
12
10
12
December
9.5
10
11
13
10
Average
9.8
11.2
10.2
8.6
10.3
8.9
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
265°
279°
306°
316°
286°
February
274°
269°
317°
302°
298°
March
274°
239°
297°
257°
233°
April
241°
256°
248°
267°
May
195°
182°
186°
217°
June
200°
196°
194°
204°
July
185°
184°
202°
360°
August
193°
171°
219°
204°
September
204°
196°
220°
322°
October
218°
217°
264°
268°
November
249°
253°
277°
255°
December
264°
233°
266°
335°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.