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
82.3
75
68
80
88
95
February
82.6
90
83
73
81
82
March
83.2
73
84
76
90
85
April
82.4
73
90
88
89
May
87.5
92
87
88
93
June
86.3
76
88
94
87
July
87.5
73
94
75
88
August
89.6
81
90
85
98
September
88.1
83
85
93
90
October
83.8
82
76
85
87
November
89.9
91
90
99
93
December
83.9
77
83
84
85
Average
85.1
78.6
79.7
84.7
87.2
89.4
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
3.5
3
6
2
3
6
February
5.2
5
5
5
2
5
March
7.8
8
8
9
10
10
April
13.3
14
14
14
11
May
19.0
20
20
19
19
June
24.3
22
23
27
25
July
27.6
27
30
25
28
August
27.0
25
29
28
28
September
22.8
22
22
24
23
October
17.4
18
17
19
17
November
10.6
9
13
11
14
December
5.5
7
6
7
6
Average
14.2
5.2
15.2
16.1
15.8
16.1
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
-5.6
-4
-1
-8
-4
-2
February
-4.3
-3
-4
-6
-4
-2
March
-1.3
1
0
0
-1
1
April
4.3
5
4
5
3
May
8.8
8
10
6
9
June
14.5
13
13
16
15
July
17.9
19
16
17
19
August
17.6
16
19
19
18
September
13.7
14
13
16
13
October
8.4
9
7
10
8
November
1.4
0
4
1
4
December
-3.9
0
-1
-1
-1
Average
5.3
-3.9
6.6
6.1
6.7
6.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.3
15
27
13
9
4
February
14.2
7
16
23
18
11
March
12.4
20
16
12
4
8
April
13.8
14
6
11
24
May
7.4
7
4
10
4
June
8.0
17
8
4
4
July
6.3
13
3
12
2
August
5.2
13
3
4
4
September
7.9
15
10
5
5
October
10.7
11
13
9
14
November
10.5
9
13
5
9
December
14.1
20
23
9
10
Average
10.3
14.2
14.4
9.7
8.1
7.8
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
8.7
8
8
9
9
9
February
8.5
8
9
9
8
8
March
9.7
9
10
8
10
10
April
9.3
8
10
10
10
May
8.2
8
8
8
9
June
7.1
6
8
7
7
July
6.5
6
7
6
7
August
6.8
7
7
6
7
September
7.0
6
7
7
8
October
7.3
6
7
7
7
November
8.3
8
9
8
8
December
8.1
7
11
7
9
Average
8.0
8.6
7.3
8.2
7.7
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
306°
310°
300°
312°
279°
February
291°
298°
283°
314°
273°
March
324°
328°
277°
269°
321°
April
062°
280°
320°
323°
May
276°
112°
302°
268°
June
101°
199°
231°
180°
July
163°
228°
343°
190°
August
199°
200°
198°
222°
September
021°
296°
248°
174°
October
282°
005°
349°
270°
November
279°
249°
274°
255°
December
275°
318°
283°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.