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
98.1
99
100
100
98
97
February
98.4
99
99
100
97
95
March
99.7
100
100
100
99
100
April
99.7
100
100
100
99
May
99.8
100
100
100
100
June
98.9
96
100
99
99
July
94.8
66
100
100
99
August
99.5
99
99
100
100
September
99.5
99
100
99
99
October
99.5
99
100
100
99
November
98.8
99
100
100
100
December
98.6
98
96
100
99
Average
98.9
99.4
96.0
99.6
99.3
98.8
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
11.4
12
11
12
11
12
February
15.0
16
14
13
15
14
March
19.6
19
18
20
19
20
April
25.0
24
27
24
25
May
29.3
28
32
30
31
June
33.9
33
33
34
35
July
34.2
35
34
32
35
August
32.9
34
31
31
35
September
30.3
31
30
30
30
October
23.4
25
21
24
26
November
17.0
17
15
19
18
December
11.6
12
11
14
10
Average
22.7
15.6
23.5
23.5
23.6
24.3
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
-3.7
-1
-2
-4
-3
-2
February
-1.7
2
-1
-3
-2
-1
March
3.8
5
3
2
3
5
April
7.5
6
9
8
7
May
12.1
12
13
13
13
June
16.5
12
18
18
16
July
17.3
6
19
19
19
August
18.2
19
18
17
19
September
14.7
15
14
16
13
October
7.9
9
8
8
7
November
1.8
3
-1
3
3
December
-2.5
0
-1
0
-2
Average
7.3
2.0
6.7
8.0
8.2
8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.3
4
1
1
0
4
February
3.1
1
3
0
4
6
March
1.7
2
1
2
2
3
April
0.7
0
0
0
1
May
1.0
2
0
1
0
June
2.2
0
4
7
1
July
1.0
0
2
1
1
August
1.5
2
2
2
0
September
1.3
2
1
2
2
October
1.8
1
5
0
2
November
1.2
2
0
0
1
December
2.0
3
4
1
1
Average
1.7
2.2
1.3
1.6
1.5
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
6.9
7
8
6
7
8
February
8.0
8
9
9
7
8
March
8.7
9
10
9
9
9
April
8.7
9
10
8
8
May
8.7
8
9
9
9
June
7.1
8
7
7
9
July
5.6
5
5
6
6
August
5.7
6
5
6
6
September
6.4
7
6
6
6
October
6.9
7
6
7
6
November
6.3
6
7
5
7
December
6.5
6
6
6
8
Average
7.2
7.9
7.3
7.2
6.9
7.3
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
311°
281°
355°
358°
351°
February
240°
219°
342°
118°
302°
March
192°
217°
255°
219°
189°
April
197°
239°
201°
177°
May
173°
171°
163°
151°
June
181°
132°
124°
164°
July
125°
102°
155°
023°
August
115°
067°
151°
093°
September
141°
148°
137°
033°
October
158°
339°
274°
097°
November
001°
259°
349°
318°
December
356°
333°
341°
350°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.