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
89.4
86
87
91
83
92
February
85.1
94
87
91
75
80
March
92.5
91
95
97
90
85
April
96.7
97
96
98
98
99
May
95.5
98
98
94
93
June
97.6
96
100
97
99
July
96.1
95
95
97
98
August
95.7
94
95
94
96
September
93.2
80
97
97
91
October
92.7
97
97
92
87
November
94.2
96
93
98
96
December
88.4
90
77
91
93
Average
93.3
92.2
92.8
94.2
92.9
93.0
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
9.9
9
13
8
9
12
February
14.6
16
17
15
11
12
March
17.7
19
18
20
19
19
April
21.7
22
22
22
21
20
May
25.9
25
28
25
24
June
29.2
28
32
30
29
July
31.4
31
32
31
33
August
30.3
30
31
31
30
September
28.3
28
27
27
27
October
22.7
23
21
23
23
November
15.8
18
17
15
19
December
12.1
13
11
17
9
Average
21.0
16.2
22.1
21.3
22.1
21.6
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
-2
2
-3
0
3
February
2.6
1
5
0
1
3
March
4.6
6
4
5
5
8
April
8.2
10
8
8
7
7
May
13.8
13
17
12
12
June
17.3
16
19
18
17
July
20.0
19
21
20
21
August
19.3
20
19
20
20
September
16.1
15
15
16
16
October
9.8
9
7
12
11
November
2.7
3
4
1
4
December
1.5
1
4
3
-2
Average
8.9
3.8
9.5
8.6
10.1
10.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
3.7
4
4
4
3
4
February
4.1
4
4
5
4
4
March
4.7
4
5
6
4
4
April
4.5
5
5
4
4
5
May
3.9
4
5
4
4
June
3.4
4
3
3
4
July
3.1
3
4
3
3
August
2.8
3
3
2
3
September
2.9
3
4
2
3
October
2.8
3
3
2
2
November
2.9
3
3
3
3
December
3.1
3
3
3
3
Average
3.6
4.2
3.6
3.8
3.2
3.5
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
280°
271°
303°
319°
280°
February
303°
272°
279°
282°
277°
March
285°
285°
269°
330°
290°
April
262°
285°
286°
300°
270°
May
314°
270°
300°
295°
June
307°
356°
298°
279°
July
271°
264°
275°
296°
August
300°
286°
357°
278°
September
349°
006°
322°
359°
October
285°
281°
286°
322°
November
322°
290°
324°
292°
December
273°
301°
260°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.