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
93.5
90
93
98
94
96
February
94.6
93
96
98
95
96
March
94.2
95
86
95
98
98
April
94.4
97
85
97
97
90
May
95.1
89
96
98
95
June
89.0
97
84
80
95
July
90.4
79
93
93
97
August
89.8
84
96
90
83
September
94.4
97
92
96
91
October
95.3
91
93
98
94
November
95.3
99
95
92
93
December
96.1
96
95
93
99
Average
93.5
93.9
90.6
93.9
93.4
93.8
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
18.2
18
16
19
19
18
February
18.2
17
16
21
19
19
March
18.5
19
16
20
17
18
April
19.6
19
18
21
19
20
May
19.5
18
20
18
23
June
21.1
20
21
20
23
July
23.3
23
22
23
24
August
24.8
24
25
25
26
September
24.8
24
27
24
27
October
23.8
23
22
23
26
November
21.1
22
20
20
22
December
18.6
19
17
17
20
Average
20.6
17.9
19.9
21.3
20.2
22.0
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
9.5
7
9
10
9
10
February
8.3
-3
8
9
9
10
March
8.1
-17
10
12
10
12
April
12.1
2
12
14
13
14
May
15.0
15
15
15
17
June
16.7
16
17
16
17
July
18.5
18
15
19
19
August
19.9
18
21
20
21
September
19.1
18
21
19
19
October
16.0
15
17
14
18
November
12.3
11
11
12
12
December
10.1
10
9
11
9
Average
12.3
-3.1
13.2
14.4
13.8
14.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.7
9
9
1
3
1
February
4.9
10
6
2
1
2
March
4.8
7
10
2
5
5
April
1.7
1
1
0
1
6
May
1.8
1
0
2
0
June
1.5
2
1
0
1
July
0.2
1
1
0
0
August
0.8
2
0
0
1
September
0.9
1
4
1
0
October
0.3
0
0
2
0
November
1.8
1
4
0
1
December
3.5
1
6
8
1
Average
2.7
6.4
2.8
1.5
1.7
1.5
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
6.0
6
7
5
6
5
February
7.1
7
7
7
6
6
March
7.4
8
8
7
8
7
April
7.4
7
8
8
7
8
May
7.6
7
8
7
7
June
7.0
7
7
7
7
July
7.2
7
7
7
8
August
7.4
8
8
8
8
September
7.3
7
7
8
8
October
6.3
7
6
7
6
November
6.2
5
7
6
6
December
5.4
5
6
6
5
Average
6.9
7.0
6.8
6.8
6.9
6.8
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
280°
222°
303°
287°
289°
February
244°
263°
286°
283°
281°
March
245°
248°
259°
268°
260°
April
259°
273°
271°
269°
225°
May
255°
232°
237°
268°
June
280°
248°
260°
254°
July
268°
261°
273°
285°
August
292°
281°
286°
281°
September
282°
279°
293°
305°
October
291°
262°
283°
273°
November
291°
260°
308°
299°
December
286°
289°
271°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.