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
95.4
88
96
95
100
94
February
92.0
91
87
96
94
92
March
98.3
100
100
97
100
100
April
99.5
100
100
99
100
98
May
99.6
100
97
100
100
100
June
100.0
100
100
100
100
100
July
94.5
99
96
100
70
100
August
89.6
100
88
100
81
100
September
98.8
98
100
100
97
October
98.4
100
100
99
95
November
96.7
98
94
93
99
December
94.2
97
83
93
97
Average
96.6
97.7
96.4
97.7
93.8
97.8
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
1.4
0
4
-1
4
1
February
2.0
5
3
4
3
4
March
10.6
12
10
12
13
10
April
16.0
17
16
15
18
16
May
23.3
22
27
19
23
22
June
26.3
24
28
25
30
24
July
31.3
34
32
32
33
29
August
30.3
31
31
33
29
29
September
23.8
24
26
23
26
October
14.5
16
19
14
13
November
5.8
8
1
7
7
December
0.9
5
-5
-3
4
Average
15.9
18.2
17.0
15.7
16.1
15.3
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
-5.7
-6
-1
-6
-2
-5
February
-6.3
-2
-3
-4
-6
-3
March
-1.4
0
-2
2
0
-2
April
3.3
4
3
2
3
2
May
9.1
8
11
8
8
9
June
12.4
12
13
12
14
12
July
15.4
17
15
16
17
14
August
14.7
15
15
17
15
14
September
10.5
10
11
11
12
October
4.0
5
6
5
4
November
-1.5
0
-5
1
0
December
-5.9
0
-11
-10
-2
Average
4.7
6.0
5.6
4.5
4.7
4.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.6
16
13
9
14
16
February
14.8
15
25
2
13
12
March
5.7
6
4
9
1
2
April
5.6
5
3
7
1
3
May
8.1
12
9
9
7
11
June
8.0
12
8
13
2
16
July
3.8
5
1
3
0
9
August
4.2
6
6
1
6
3
September
6.6
7
3
8
3
October
6.0
5
1
7
12
November
11.0
11
19
5
5
December
13.4
9
29
18
10
Average
7.9
9.0
7.9
7.9
6.2
8.4
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
7.8
8
7
7
8
10
February
6.9
7
9
7
6
7
March
7.1
7
5
8
8
8
April
7.5
8
8
7
7
7
May
6.2
7
5
8
6
7
June
6.2
6
6
7
6
6
July
5.1
6
5
5
4
5
August
5.2
6
5
5
6
6
September
5.7
6
5
6
5
October
6.6
7
6
8
6
November
7.7
7
8
9
9
December
7.2
8
5
8
7
Average
6.5
6.8
6.5
6.5
6.6
6.7
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
086°
091°
100°
102°
095°
February
171°
119°
116°
226°
120°
March
119°
113°
115°
032°
268°
April
193°
107°
139°
254°
270°
May
271°
250°
175°
239°
137°
June
175°
265°
182°
136°
112°
July
224°
239°
163°
244°
199°
August
232°
271°
156°
272°
233°
September
130°
131°
114°
133°
October
109°
150°
100°
107°
November
099°
102°
099°
110°
December
097°
184°
093°
096°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.