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
90.2
83
93
95
91
83
February
86.6
92
87
94
77
93
March
92.8
93
89
97
99
80
April
95.6
97
98
96
93
May
95.9
97
96
87
96
June
98.2
96
99
99
99
July
99.4
100
100
99
99
August
97.7
100
94
98
100
September
96.7
98
100
99
93
October
94.1
95
96
96
91
November
91.8
88
85
97
93
December
88.6
89
72
93
94
Average
93.7
89.7
94.3
94.7
94.4
92.9
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
14.0
11
17
15
13
15
February
16.1
20
17
16
11
15
March
21.4
21
23
22
21
21
April
24.1
23
26
23
24
May
28.8
29
31
25
29
June
33.4
35
35
32
33
July
36.0
38
39
34
35
August
35.5
40
35
34
36
September
32.0
35
33
33
29
October
26.0
26
27
28
25
November
19.5
19
18
20
22
December
16.1
17
16
22
16
Average
24.3
17.3
26.5
26.3
24.7
25.1
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
1.2
-1
3
-2
2
4
February
3.5
7
4
-1
-1
3
March
8.7
10
8
5
8
12
April
11.3
11
14
11
11
May
17.3
17
19
16
17
June
22.1
22
23
22
22
July
24.2
25
26
23
25
August
23.7
26
25
23
22
September
19.7
22
19
18
18
October
12.3
14
11
14
11
November
6.2
7
6
6
8
December
4.1
4
7
8
2
Average
11.9
5.2
13.5
12.7
12.6
12.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.3
8
7
2
4
8
February
7.4
8
11
7
7
7
March
3.9
7
3
3
3
7
April
2.8
2
1
5
2
May
4.0
2
2
10
7
June
2.6
1
2
3
4
July
1.2
1
0
2
2
August
2.7
0
7
2
1
September
3.0
1
1
0
3
October
7.2
9
7
2
9
November
5.2
8
10
5
4
December
6.0
5
11
1
9
Average
4.5
7.5
4.0
4.1
3.5
5.1
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
9.4
9
10
9
9
9
February
10.2
10
9
10
10
10
March
10.7
10
11
11
11
9
April
11.3
10
13
10
9
May
9.7
8
12
9
10
June
8.8
8
8
8
9
July
8.0
9
8
7
8
August
7.8
8
8
8
7
September
7.6
8
7
7
7
October
9.1
10
8
9
9
November
9.0
8
8
9
9
December
8.6
8
8
9
9
Average
9.2
9.6
8.9
9.4
8.9
8.8
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
322°
255°
310°
317°
187°
February
217°
245°
302°
359°
304°
March
164°
184°
206°
173°
171°
April
111°
168°
141°
160°
May
147°
161°
115°
143°
June
134°
150°
160°
168°
July
172°
163°
159°
161°
August
136°
139°
157°
154°
September
147°
145°
140°
066°
October
142°
140°
189°
118°
November
159°
150°
163°
168°
December
196°
306°
184°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.