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
92.3
84
92
94
96
93
February
93.6
88
95
97
95
95
March
92.9
88
86
93
97
95
April
90.3
86
77
95
93
92
May
89.9
74
94
95
91
June
84.9
88
80
83
88
July
84.6
76
83
85
90
August
88.6
82
94
92
89
September
91.7
90
92
92
88
October
94.4
93
84
97
99
November
95.2
96
95
89
98
December
94.8
94
92
89
99
Average
90.7
86.6
86.1
90.8
91.6
92.6
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
18.9
18
17
20
20
19
February
18.5
17
17
22
19
20
March
19.0
18
17
21
19
18
April
21.2
20
19
22
22
21
May
21.2
19
22
22
24
June
23.6
21
26
25
24
July
26.1
26
25
27
26
August
27.2
27
28
28
28
September
27.2
25
29
27
30
October
25.7
25
24
25
28
November
22.9
24
21
24
23
December
19.5
21
17
17
21
Average
22.1
18.3
21.5
23.2
22.8
23.4
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
8.0
8
8
8
8
7
February
7.6
9
6
7
8
8
March
8.9
9
7
9
8
10
April
11.1
10
10
11
12
12
May
13.4
13
13
14
15
June
14.7
14
12
15
16
July
17.2
16
17
19
16
August
18.5
18
19
18
19
September
17.4
17
20
18
17
October
14.2
14
15
13
15
November
10.5
10
8
11
9
December
8.3
9
7
9
7
Average
12.1
8.9
11.6
12.4
12.6
12.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.3
11
12
2
3
1
February
6.0
12
8
4
0
4
March
5.6
9
12
3
5
8
April
1.6
1
0
1
1
7
May
2.5
2
0
1
0
June
0.8
2
0
0
1
July
0.1
1
0
0
0
August
0.7
4
0
0
0
September
0.5
1
2
1
0
October
0.3
0
1
0
0
November
2.5
2
7
0
2
December
3.8
1
8
6
3
Average
3.0
8.0
3.6
1.9
1.4
2.0
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
5.6
5
7
5
6
5
February
6.2
6
7
6
5
5
March
5.9
6
6
6
7
6
April
5.7
6
5
6
6
6
May
5.9
5
6
6
6
June
5.3
5
5
5
6
July
5.0
4
5
5
5
August
5.2
5
5
6
5
September
5.1
5
5
5
5
October
5.4
5
5
6
5
November
5.5
6
7
5
5
December
5.4
6
5
6
6
Average
5.6
5.8
5.4
5.5
5.5
5.3
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
216°
210°
180°
249°
241°
February
214°
222°
243°
250°
239°
March
246°
231°
244°
238°
248°
April
265°
270°
268°
271°
238°
May
262°
257°
263°
278°
June
278°
280°
281°
271°
July
284°
279°
281°
288°
August
282°
284°
275°
284°
September
277°
281°
282°
283°
October
269°
273°
258°
271°
November
219°
232°
273°
270°
December
192°
220°
220°
216°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.