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
92.1
90
91
91
97
93
February
91.9
95
90
93
90
91
March
94.5
94
97
96
96
93
April
96.0
96
95
100
98
May
95.5
94
94
97
99
June
95.6
94
97
95
96
July
96.9
96
96
96
98
August
96.3
96
96
95
98
September
95.8
97
95
95
97
October
94.4
96
95
92
96
November
93.9
95
94
96
96
December
91.6
94
87
95
97
Average
94.5
92.8
94.7
94.6
95.2
96.3
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
9.5
8
13
8
8
11
February
13.9
14
16
14
11
10
March
16.1
18
15
18
17
18
April
20.5
22
21
20
18
May
24.4
23
26
23
25
June
27.4
26
29
28
27
July
29.7
30
30
30
31
August
28.9
29
29
30
29
September
26.7
27
25
26
25
October
21.7
21
20
22
22
November
14.9
16
16
13
18
December
11.6
12
11
16
9
Average
19.6
13.3
20.9
20.8
21.0
20.4
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
-1.9
-2
2
-3
0
3
February
2.5
1
4
1
1
3
March
4.3
5
3
4
5
7
April
7.6
9
7
6
7
May
13.5
12
14
12
14
June
16.7
15
17
17
17
July
19.1
19
20
17
19
August
18.8
19
19
19
20
September
15.5
16
14
15
16
October
10.1
9
7
12
11
November
3.0
3
5
0
5
December
1.5
0
4
3
-1
Average
8.5
1.5
9.6
9.2
9.4
10.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.2
17
0
0
10
12
February
9.0
6
0
0
14
15
March
6.9
7
0
0
3
9
April
6.8
7
0
0
5
May
12.9
5
0
0
8
June
4.4
5
0
0
5
July
2.1
4
0
0
4
August
2.4
6
0
0
5
September
2.5
3
0
0
8
October
2.4
2
0
0
4
November
2.9
1
0
0
2
December
5.0
8
0
0
10
Average
5.9
9.7
3.5
1.4
6.5
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
4.1
0
5
5
5
5
February
4.1
0
5
6
5
5
March
5.7
6
5
6
5
5
April
5.2
5
5
6
6
May
4.1
5
4
4
5
June
3.3
4
3
3
4
July
2.8
3
3
3
3
August
2.7
3
3
3
3
September
3.2
3
3
3
3
October
3.7
4
4
3
3
November
4.0
3
5
4
5
December
3.7
0
4
4
4
Average
3.7
2.3
3.7
4.0
3.7
4.0
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
360°
261°
269°
262°
270°
February
243°
270°
261°
260°
281°
March
274°
286°
264°
274°
278°
April
256°
273°
282°
271°
May
275°
273°
266°
039°
June
279°
285°
285°
270°
July
283°
282°
275°
282°
August
285°
278°
297°
288°
September
290°
274°
277°
192°
October
269°
259°
273°
291°
November
263°
252°
272°
258°
December
360°
255°
260°
276°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.