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
85
91
93
86
94
February
89.2
91
96
90
76
91
March
92.5
90
91
91
94
96
April
95.4
93
98
97
97
97
May
92.5
95
87
99
88
June
96.4
93
99
98
96
July
98.3
98
98
98
99
August
95.2
92
94
96
95
September
93.8
98
94
98
92
October
92.3
95
92
96
90
November
93.4
94
88
100
93
December
89.8
86
87
95
94
Average
93.1
90.1
94.0
92.8
94.8
93.8
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
8.4
8
12
7
8
9
February
12.9
14
16
12
8
12
March
15.8
18
16
18
17
18
April
21.2
22
23
21
21
19
May
24.8
23
25
24
22
June
28.5
27
30
29
28
July
31.7
32
33
31
33
August
29.9
30
30
32
30
September
26.9
27
26
27
25
October
21.7
22
20
22
22
November
14.8
16
16
14
18
December
10.8
12
9
15
10
Average
20.0
15.6
21.4
20.9
20.8
20.5
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
-1.9
0
3
-3
0
2
February
2.4
3
5
1
0
2
March
4.9
7
5
6
5
8
April
9.3
12
9
10
9
8
May
14.1
12
14
12
13
June
18.0
16
19
18
18
July
20.9
21
22
21
22
August
19.9
20
20
21
21
September
16.6
16
16
17
16
October
11.0
11
8
13
11
November
3.9
4
6
3
7
December
1.9
3
2
4
1
Average
9.6
5.2
10.3
10.2
10.3
10.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.8
14
13
9
11
9
February
12.6
12
8
16
14
12
March
8.8
9
12
10
6
8
April
8.2
8
8
8
4
9
May
9.3
7
12
7
15
June
6.4
9
3
1
9
July
3.6
2
8
3
2
August
5.8
6
6
2
11
September
7.3
5
8
6
10
October
7.5
6
7
5
10
November
8.1
7
15
3
6
December
9.9
16
9
5
9
Average
8.3
10.5
8.1
8.8
5.2
9.1
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
7.5
8
7
7
7
7
February
7.2
6
8
8
7
7
March
8.0
8
8
9
7
7
April
8.0
8
7
8
9
9
May
6.6
7
6
6
7
June
6.2
7
7
6
6
July
5.3
5
5
6
6
August
5.0
5
5
5
5
September
5.4
5
6
6
5
October
5.7
6
5
6
5
November
6.4
6
6
7
7
December
5.7
5
5
5
7
Average
6.5
7.5
6.3
6.4
6.2
6.5
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°
283°
309°
286°
292°
February
282°
276°
262°
278°
270°
March
277°
289°
254°
292°
232°
April
254°
238°
272°
288°
284°
May
298°
022°
267°
276°
June
292°
296°
220°
278°
July
261°
253°
263°
237°
August
277°
248°
157°
232°
September
340°
325°
282°
068°
October
280°
310°
278°
261°
November
291°
273°
284°
276°
December
278°
260°
258°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.