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
89.8
81
92
91
89
96
February
89.3
95
95
86
81
90
March
90.5
85
91
85
89
93
April
94.8
92
93
96
95
May
91.6
98
82
98
95
June
94.8
85
98
94
98
July
96.8
95
95
99
99
August
97.4
96
97
98
97
September
93.2
90
95
99
95
October
92.4
95
87
95
87
November
95.0
98
90
100
95
December
87.0
77
76
98
96
Average
92.4
86.8
92.1
90.4
94.9
94.9
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
8.0
8
11
6
7
10
February
11.3
12
13
12
7
11
March
14.6
16
15
16
16
17
April
20.3
23
19
20
18
May
24.4
23
24
24
22
June
29.1
28
29
29
29
July
31.9
32
31
32
33
August
30.5
30
31
31
30
September
27.2
27
27
27
25
October
21.6
22
19
23
21
November
14.4
15
16
14
17
December
10.1
11
9
13
9
Average
19.3
11.8
20.9
20.4
20.4
20.3
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
0.9
1
4
-2
1
3
February
2.5
3
4
1
0
3
March
5.0
7
5
6
6
8
April
10.3
12
9
10
9
May
15.1
13
16
14
14
June
20.1
19
20
21
21
July
23.3
23
23
23
24
August
22.3
22
22
22
23
September
18.8
19
18
19
17
October
13.1
13
10
15
13
November
5.7
5
7
5
8
December
2.8
4
3
5
2
Average
10.7
3.6
11.8
11.5
11.6
11.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.8
24
17
12
10
7
February
14.0
10
15
19
21
13
March
11.0
17
16
14
8
5
April
8.7
12
10
4
10
May
9.4
7
13
10
7
June
5.8
12
4
5
3
July
4.1
3
4
3
3
August
5.1
5
2
5
10
September
8.1
15
7
5
6
October
8.2
5
16
6
10
November
8.2
9
11
4
8
December
11.4
15
21
2
8
Average
9.5
17.3
10.2
10.2
6.6
7.3
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
8.9
9
8
9
9
8
February
8.5
8
9
9
8
8
March
9.6
9
10
10
9
8
April
9.1
9
9
9
9
May
8.2
7
8
8
9
June
8.0
8
8
8
8
July
7.1
7
7
8
7
August
7.0
7
7
6
7
September
7.5
8
8
8
7
October
7.8
7
8
8
8
November
8.0
7
8
8
8
December
7.3
6
7
7
9
Average
8.1
8.6
7.8
8.2
7.9
8.0
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
313°
288°
319°
318°
301°
February
285°
257°
274°
325°
260°
March
328°
303°
260°
297°
215°
April
200°
297°
288°
302°
May
035°
064°
310°
319°
June
002°
251°
183°
207°
July
203°
184°
206°
163°
August
261°
210°
149°
179°
September
012°
333°
236°
051°
October
284°
344°
297°
286°
November
308°
281°
301°
242°
December
296°
314°
223°
276°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.