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
88.2
79
89
73
93
90
February
89.4
93
92
88
86
87
March
93.6
93
96
85
97
90
April
96.8
97
98
97
97
May
95.5
94
94
97
98
June
94.7
90
93
95
97
July
94.1
92
91
95
96
August
91.1
95
93
95
93
September
87.2
94
95
91
69
October
88.2
92
86
89
81
November
92.2
96
93
90
94
December
86.5
76
92
91
89
Average
91.4
88.4
92.1
90.2
93.2
90.1
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
8.1
8
9
7
8
8
February
7.5
11
7
8
7
8
March
10.9
13
11
11
10
10
April
13.7
12
12
15
14
May
18.3
22
15
16
18
June
20.7
22
19
22
19
July
23.0
25
23
23
22
August
23.7
25
25
23
23
September
20.2
21
21
19
21
October
14.5
16
17
13
14
November
10.0
12
8
10
10
December
7.5
11
5
5
9
Average
14.3
10.7
16.0
14.6
14.3
14.5
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
3.5
4
4
3
4
4
February
2.2
6
2
3
2
3
March
3.7
6
4
5
3
2
April
5.5
5
4
5
5
May
7.8
8
7
7
7
June
9.6
10
9
10
10
July
10.7
11
11
11
11
August
11.3
13
10
12
11
September
10.4
11
10
10
11
October
7.3
9
8
7
8
November
4.9
6
2
6
5
December
3.2
7
1
1
4
Average
6.4
4.9
7.5
6.1
6.5
6.6
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
21
9
8
16
21
February
12.8
11
9
10
14
13
March
7.2
4
7
12
6
4
April
8.8
9
7
6
6
May
6.5
5
11
4
9
June
5.3
4
7
3
8
July
2.0
2
3
0
5
August
1.6
2
0
3
2
September
6.5
4
0
12
8
October
10.4
11
10
14
6
November
12.9
4
8
28
17
December
12.3
12
9
7
13
Average
8.3
11.7
6.1
6.9
8.4
8.7
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
6.4
6
6
5
7
8
February
6.2
6
6
6
6
6
March
6.2
7
6
6
6
6
April
6.5
8
7
5
5
May
5.0
5
6
5
5
June
5.4
6
5
6
5
July
4.9
5
4
5
5
August
4.8
5
5
5
5
September
4.7
5
5
5
4
October
5.3
5
5
6
5
November
5.9
5
6
6
7
December
5.7
5
6
6
6
Average
5.6
6.2
5.6
5.3
5.6
5.5
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
097°
111°
127°
128°
144°
February
103°
139°
094°
135°
153°
March
136°
127°
110°
154°
109°
April
150°
156°
140°
106°
May
170°
175°
189°
172°
June
184°
155°
159°
178°
July
167°
144°
165°
181°
August
105°
140°
159°
150°
September
133°
076°
136°
121°
October
079°
133°
134°
163°
November
113°
064°
139°
147°
December
133°
089°
090°
131°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.