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
84.6
81
75
88
78
89
February
84.8
91
85
92
79
81
March
92.2
88
93
95
94
88
April
95.8
94
98
99
99
May
95.9
95
95
98
96
June
96.1
94
98
98
97
July
95.7
94
94
96
99
August
94.0
92
94
93
91
September
95.1
95
96
95
93
October
93.0
95
98
89
87
November
93.0
95
93
99
96
December
85.0
84
60
92
90
Average
91.8
86.3
91.2
92.9
92.9
92.5
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
12
8
8
12
February
14.1
16
16
14
11
12
March
17.4
19
17
19
19
19
April
21.4
22
21
21
20
May
25.9
25
27
25
24
June
29.1
28
31
29
29
July
31.2
31
32
31
33
August
30.2
30
30
31
30
September
28.1
29
27
27
27
October
22.5
23
21
22
23
November
15.5
18
16
14
18
December
11.9
12
11
16
10
Average
20.5
13.8
21.8
21.7
21.1
21.2
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
0.8
-2
3
-2
1
4
February
3.8
3
6
1
1
4
March
6.3
7
6
6
7
10
April
9.4
10
9
8
8
May
15.3
14
17
13
13
June
18.7
17
20
19
19
July
21.3
21
22
21
22
August
20.4
21
20
21
21
September
17.4
17
16
17
17
October
11.1
11
8
13
12
November
4.2
6
5
2
5
December
2.8
3
4
6
0
Average
10.0
2.9
11.2
10.8
10.8
11.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.1
22
19
16
13
15
February
15.9
12
13
10
17
28
March
10.0
13
10
7
10
14
April
9.4
10
7
5
8
May
6.2
3
11
5
8
June
5.4
8
2
6
4
July
3.4
2
6
4
4
August
6.1
7
3
9
8
September
6.5
3
7
6
9
October
6.8
5
2
12
5
November
8.0
8
12
2
7
December
13.5
18
26
7
11
Average
9.3
15.7
8.3
8.1
7.7
9.5
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
6.6
7
7
7
6
7
February
7.1
7
8
7
6
7
March
7.5
7
8
9
7
8
April
7.6
8
7
8
7
May
6.6
7
7
6
6
June
6.0
6
6
5
7
July
5.6
6
7
6
5
August
5.1
6
5
5
5
September
5.0
5
6
4
6
October
5.2
6
6
5
5
November
5.3
5
5
5
5
December
5.9
6
6
6
5
Average
6.2
6.7
6.3
6.5
5.8
6.0
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
270°
243°
269°
290°
257°
February
256°
240°
249°
283°
254°
March
256°
254°
237°
315°
247°
April
268°
249°
253°
260°
May
287°
232°
270°
252°
June
264°
272°
247°
231°
July
241°
239°
242°
254°
August
253°
247°
303°
245°
September
328°
350°
300°
009°
October
273°
287°
251°
319°
November
318°
282°
280°
284°
December
264°
285°
226°
264°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.