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
84.9
69
83
90
91
82
February
88.0
88
97
92
84
87
March
88.7
89
85
97
89
78
April
92.4
92
97
91
95
May
87.6
88
83
85
90
June
94.5
88
98
92
99
July
95.2
92
93
96
95
August
95.6
99
98
95
96
September
91.7
84
94
99
90
October
92.5
98
97
98
90
November
90.2
85
92
98
93
December
88.9
77
86
98
89
Average
90.1
82.3
88.9
93.1
92.8
90.5
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
7.6
4
8
8
9
8
February
10.0
15
12
10
4
9
March
15.9
18
14
16
16
16
April
20.8
22
22
20
21
May
25.3
26
27
23
25
June
31.8
28
33
32
34
July
33.9
33
37
33
33
August
33.2
34
35
34
33
September
30.2
31
32
32
29
October
21.5
23
24
23
21
November
14.7
16
13
16
16
December
10.3
11
9
15
9
Average
20.2
11.9
21.4
22.5
21.5
21.2
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
-6.6
-7
-5
-8
-4
-4
February
-5.1
0
-5
-7
-9
-3
March
0.6
1
-1
-1
2
3
April
4.9
5
6
5
4
May
11.6
13
11
11
11
June
17.6
17
18
20
18
July
19.8
20
21
20
20
August
18.6
19
19
19
18
September
15.3
16
15
16
13
October
6.3
7
7
8
5
November
0.3
1
-1
2
3
December
-4.4
-1
-4
-3
-3
Average
5.7
-2.0
7.1
6.7
7.3
7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.7
5
9
9
2
3
February
4.4
5
1
8
11
4
March
3.6
4
3
4
8
4
April
4.0
8
1
2
2
May
4.7
8
8
6
2
June
2.0
4
4
1
1
July
1.7
1
6
1
1
August
1.1
1
1
1
1
September
2.7
5
2
0
6
October
3.8
2
1
4
1
November
4.1
8
8
4
3
December
4.1
14
0
0
6
Average
3.5
4.6
5.0
4.2
3.1
2.6
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
11.2
11
11
12
12
11
February
12.2
12
13
13
12
12
March
13.7
13
14
14
15
13
April
14.3
14
16
14
13
May
12.1
12
14
12
13
June
12.0
9
13
10
16
July
9.9
9
11
10
10
August
10.1
9
9
12
10
September
11.9
10
10
13
11
October
11.8
13
11
11
12
November
12.1
11
15
11
13
December
11.5
10
14
11
11
Average
11.9
11.9
11.2
12.5
11.9
12.0
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
300°
322°
326°
318°
313°
February
273°
283°
346°
045°
326°
March
007°
353°
345°
220°
175°
April
230°
231°
289°
329°
May
153°
123°
149°
088°
June
149°
172°
171°
189°
July
181°
156°
160°
147°
August
176°
157°
175°
161°
September
172°
166°
179°
179°
October
210°
227°
232°
194°
November
258°
275°
281°
203°
December
299°
262°
244°
322°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.