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
98.8
99
99
100
99
100
February
99.1
96
99
100
100
99
March
99.5
99
99
100
100
100
April
99.7
99
100
100
99
May
99.8
100
100
100
100
June
99.4
99
100
99
100
July
99.9
100
100
100
100
August
99.5
99
100
98
100
September
99.6
100
99
100
100
October
99.0
96
100
100
100
November
99.5
100
98
100
100
December
99.5
99
100
100
100
Average
99.3
97.6
99.0
99.7
99.6
99.7
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
13.0
13
11
14
13
14
February
14.9
14
13
16
16
17
March
18.7
19
15
21
18
17
April
25.1
25
26
26
23
May
29.0
29
30
30
31
June
35.4
32
36
37
35
July
38.5
40
38
38
39
August
37.3
36
36
38
39
September
33.2
32
34
34
35
October
25.5
27
27
23
28
November
18.6
18
15
22
19
December
12.8
16
11
12
13
Average
24.1
15.2
24.4
25.8
25.5
26.1
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
-1.7
0
0
-3
0
-1
February
0.9
4
-2
-2
1
1
March
5.0
7
3
5
3
5
April
9.7
8
9
9
10
May
13.6
14
13
14
15
June
19.2
17
20
22
17
July
23.4
24
23
25
21
August
20.8
19
22
20
20
September
16.8
16
18
17
17
October
8.6
9
10
8
9
November
2.5
3
0
5
3
December
-1.2
0
-2
0
-3
Average
9.2
3.3
9.2
9.8
10.4
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
7
8
0
3
0
February
4.6
17
6
1
1
3
March
3.8
7
9
2
2
3
April
1.8
2
3
1
3
May
1.1
2
0
0
0
June
0.6
3
0
1
0
July
0.7
0
2
1
0
August
1.8
7
3
0
0
September
0.6
1
2
0
0
October
0.3
0
1
1
0
November
1.5
0
3
0
0
December
2.1
1
4
4
1
Average
2.6
10.0
3.2
1.5
1.1
0.8
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
3.6
3
7
3
2
3
February
5.2
5
8
4
4
3
March
6.4
8
8
7
7
6
April
6.8
6
8
6
6
May
6.9
8
7
6
7
June
6.5
6
8
7
7
July
6.3
6
7
5
6
August
5.7
7
6
6
6
September
5.3
6
6
5
4
October
3.3
3
3
5
3
November
3.1
3
5
2
3
December
3.1
2
5
4
3
Average
5.3
5.5
5.8
5.8
5.0
4.9
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
307°
055°
022°
040°
015°
February
139°
200°
296°
303°
058°
March
214°
291°
309°
160°
098°
April
268°
268°
310°
260°
May
146°
306°
266°
257°
June
115°
234°
202°
106°
July
141°
114°
123°
136°
August
122°
128°
130°
147°
September
089°
121°
196°
032°
October
304°
077°
148°
279°
November
283°
200°
046°
286°
December
311°
110°
141°
347°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.