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
88
76
96
78
80
February
83.6
95
87
79
70
81
March
87.1
81
89
92
86
89
April
92.5
93
95
97
94
May
91.3
94
94
96
81
June
92.7
88
99
94
94
July
94.8
97
91
94
95
August
93.4
94
92
97
90
September
93.2
95
94
89
84
October
90.5
98
92
93
80
November
91.5
98
86
99
83
December
84.3
85
79
88
85
Average
89.6
87.7
92.0
91.4
90.7
86.9
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
11.2
11
13
10
10
12
February
14.3
16
17
14
11
13
March
18.4
19
18
19
18
20
April
22.4
23
23
22
22
May
25.3
24
27
25
23
June
28.6
27
30
29
28
July
31.7
32
32
31
32
August
30.2
31
30
31
30
September
27.6
28
27
27
25
October
23.0
24
21
24
23
November
16.7
18
18
16
19
December
13.1
14
10
17
12
Average
21.7
15.0
22.3
21.8
21.8
21.5
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
0.7
-1
3
-2
-1
2
February
2.4
2
5
1
0
4
March
5.1
5
5
5
3
8
April
8.2
8
7
6
8
May
12.9
12
14
12
12
June
17.3
15
18
18
18
July
20.1
20
21
20
21
August
19.3
19
20
20
20
September
15.3
14
15
15
16
October
8.0
6
7
12
11
November
2.7
2
5
1
4
December
1.2
0
2
4
0
Average
9.3
1.9
9.0
9.5
9.0
10.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.0
13
11
10
11
18
February
11.3
6
10
9
14
19
March
10.2
12
10
9
11
9
April
9.5
14
5
4
7
May
6.8
7
3
4
13
June
6.0
8
3
4
7
July
3.5
2
4
5
5
August
4.8
5
3
4
7
September
4.5
3
7
9
7
October
4.2
2
3
4
6
November
5.0
3
9
3
5
December
9.8
12
11
6
6
Average
7.5
10.2
6.9
5.8
6.3
9.0
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
3.8
5
3
3
3
4
February
4.3
5
4
3
4
5
March
4.4
5
4
5
4
4
April
4.5
5
4
5
4
May
4.0
5
3
3
4
June
3.0
3
2
3
3
July
2.4
2
2
2
2
August
2.1
3
2
1
2
September
2.3
2
2
2
3
October
2.5
3
2
2
2
November
2.8
3
3
3
2
December
3.0
3
2
3
3
Average
3.3
4.9
3.4
2.9
2.8
3.2
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
268°
257°
283°
288°
275°
February
231°
235°
242°
313°
247°
March
312°
250°
240°
014°
234°
April
225°
240°
251°
263°
May
007°
219°
237°
292°
June
269°
336°
206°
240°
July
234°
226°
225°
222°
August
269°
228°
158°
220°
September
040°
023°
006°
045°
October
255°
349°
253°
031°
November
010°
029°
299°
260°
December
258°
241°
231°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.