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
96.3
95
93
99
95
99
February
88.7
97
97
100
24
93
March
95.0
98
99
98
82
93
April
98.4
100
100
96
97
May
99.0
99
99
99
99
June
99.1
100
99
98
100
July
99.1
100
99
100
100
August
96.2
100
99
97
100
September
97.3
98
98
99
99
October
95.8
96
98
100
98
November
91.9
87
87
98
95
December
95.5
93
95
100
99
Average
96.2
96.7
96.9
97.6
91.3
97.7
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
14.9
14
16
15
14
16
February
17.8
20
17
16
16
17
March
22.4
22
22
22
22
22
April
27.6
27
29
25
27
May
32.1
31
34
30
34
June
36.1
37
36
36
36
July
36.0
38
37
33
38
August
34.8
37
33
32
37
September
31.6
34
31
33
31
October
25.5
26
24
28
28
November
19.3
19
17
21
22
December
16.2
17
17
21
15
Average
25.3
18.5
26.7
26.1
25.8
26.8
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
-1.5
0
1
-2
-1
0
February
1.1
4
1
-3
-1
1
March
5.9
7
6
2
5
9
April
9.7
9
11
9
10
May
14.9
14
17
16
15
June
19.9
21
21
20
20
July
21.9
23
23
20
23
August
20.9
23
21
20
21
September
17.1
19
17
17
15
October
10.1
12
10
11
9
November
4.1
6
3
4
5
December
1.3
2
4
5
-2
Average
9.7
3.5
11.3
10.5
10.3
10.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.2
1
2
0
1
2
February
1.7
3
1
0
4
4
March
1.3
0
0
2
2
5
April
1.1
0
0
3
0
May
0.3
1
0
0
0
June
0.6
0
1
3
0
July
0.6
0
0
2
0
August
2.0
2
6
4
1
September
1.8
1
2
1
2
October
2.5
0
3
0
2
November
3.0
4
4
3
2
December
1.7
2
3
0
1
Average
1.4
1.2
1.1
1.7
1.9
1.4
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
9.1
11
9
8
8
9
February
9.8
11
11
8
8
9
March
10.5
12
11
11
11
10
April
10.3
11
12
10
9
May
9.5
8
11
9
8
June
8.1
9
8
7
9
July
7.0
8
7
6
6
August
6.2
7
7
6
6
September
7.0
7
6
7
7
October
8.0
8
8
8
8
November
8.4
8
10
7
9
December
7.7
8
9
8
8
Average
8.7
11.2
8.7
8.5
7.9
8.2
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
240°
248°
300°
252°
274°
February
267°
242°
204°
167°
254°
March
256°
233°
275°
237°
235°
April
233°
242°
231°
248°
May
170°
243°
149°
215°
June
243°
120°
135°
168°
July
145°
121°
132°
132°
August
098°
076°
144°
139°
September
147°
146°
179°
077°
October
156°
296°
244°
248°
November
255°
247°
304°
228°
December
270°
241°
249°
316°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.