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
88.4
86
89
87
89
92
February
86.2
90
90
90
65
85
March
88.2
77
91
84
87
89
April
95.0
94
94
99
95
May
86.3
84
71
98
82
June
92.0
79
95
92
95
July
97.4
98
94
97
99
August
95.8
94
98
96
94
September
95.2
91
96
99
97
October
90.1
96
80
95
81
November
92.1
90
89
99
89
December
89.9
85
89
89
89
Average
90.8
83.4
89.9
88.7
93.0
90.8
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
10.2
11
14
9
8
12
February
13.2
13
14
13
8
13
March
15.3
17
16
17
17
18
April
20.8
22
21
20
20
May
24.4
22
24
25
22
June
28.3
27
29
28
28
July
31.1
31
31
31
33
August
30.0
30
31
31
30
September
27.3
27
28
27
25
October
22.6
23
19
24
22
November
16.1
15
18
16
19
December
12.4
14
12
15
12
Average
20.1
13.5
21.3
21.1
21.0
21.0
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
1.7
3
4
-1
2
4
February
3.6
4
5
2
1
4
March
6.0
8
6
7
6
8
April
10.8
12
10
10
9
May
15.6
14
16
13
14
June
20.1
18
20
20
20
July
22.9
23
23
22
24
August
22.0
22
22
23
22
September
19.6
19
19
19
19
October
13.5
12
11
15
14
November
6.5
6
8
6
8
December
3.4
4
3
5
3
Average
11.3
4.6
12.3
11.9
12.0
12.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.3
11
11
17
7
5
February
12.6
13
23
9
23
11
March
9.3
16
7
14
6
8
April
6.5
9
4
2
8
May
8.2
8
16
4
8
June
5.3
9
4
5
8
July
4.4
5
10
5
1
August
5.8
11
4
6
8
September
4.8
8
5
3
6
October
7.1
5
13
5
9
November
7.9
13
12
3
4
December
8.5
9
13
4
13
Average
7.8
13.2
9.2
9.9
5.4
7.0
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
9.0
10
8
10
9
9
February
9.2
9
10
9
10
9
March
10.2
10
9
10
10
11
April
10.2
9
10
9
12
May
9.5
10
10
9
11
June
8.2
9
8
8
9
July
7.9
8
9
8
8
August
7.4
8
7
7
8
September
8.1
8
9
8
8
October
7.8
8
8
8
8
November
8.1
8
7
9
7
December
8.0
7
8
8
9
Average
8.8
9.5
8.4
8.6
8.4
9.1
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
275°
257°
335°
307°
286°
February
352°
279°
249°
336°
253°
March
343°
283°
244°
042°
359°
April
139°
259°
260°
264°
May
065°
042°
128°
047°
June
121°
157°
191°
137°
July
206°
200°
230°
185°
August
132°
189°
170°
146°
September
045°
060°
161°
053°
October
302°
360°
295°
026°
November
019°
046°
306°
233°
December
233°
309°
278°
261°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.