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
90.8
93
80
100
89
99
February
90.6
83
88
96
99
98
March
91.3
84
83
97
93
90
April
97.9
100
99
100
89
May
97.4
97
100
100
100
June
99.5
99
100
100
99
July
99.4
100
100
99
100
August
99.2
96
100
100
100
September
99.2
100
99
100
99
October
99.0
100
100
94
100
November
96.2
99
95
100
95
December
92.9
97
93
83
97
Average
95.2
86.5
95.1
98.3
96.4
97.2
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
7.0
7
4
8
7
9
February
6.6
6
4
7
9
10
March
8.2
7
4
11
9
6
April
14.4
14
15
15
13
May
17.2
16
19
18
19
June
22.9
19
24
25
22
July
25.9
27
26
26
26
August
25.1
24
25
26
26
September
21.9
21
22
23
24
October
16.8
17
16
15
20
November
12.0
11
8
15
12
December
8.0
10
5
7
8
Average
14.5
6.3
14.3
15.8
16.1
16.3
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
-5.1
-4
-5
-5
-5
-5
February
-6.6
-4
-7
-6
-4
-5
March
-4.6
-3
-5
-3
-5
-4
April
-1.6
-2
0
-1
0
May
1.2
1
2
1
2
June
4.9
3
6
8
5
July
8.5
9
9
10
6
August
8.1
8
9
8
9
September
4.7
4
6
5
5
October
-1.8
0
1
-1
0
November
-4.6
-4
-5
-3
-4
December
-6.9
-4
-7
-5
-6
Average
-1.9
-4.3
-1.8
0.7
0.7
0.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.4
6
19
1
8
0
February
8.1
18
12
4
2
4
March
8.4
15
19
3
7
10
April
1.9
0
1
2
11
May
1.4
4
0
0
0
June
0.4
1
0
1
0
July
2.2
1
2
4
0
August
2.9
4
4
3
4
September
1.3
2
3
0
0
October
0.9
0
1
3
0
November
3.4
1
7
0
6
December
5.8
3
8
13
2
Average
4.6
13.0
5.3
2.5
3.4
2.8
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
5.8
6
7
6
6
5
February
6.7
6
8
7
7
6
March
6.9
7
8
7
7
6
April
6.9
7
8
7
6
May
6.2
6
7
6
6
June
5.9
6
6
6
6
July
4.9
6
5
5
6
August
4.9
6
4
6
5
September
5.5
5
5
6
5
October
5.8
6
6
6
5
November
5.9
6
7
6
5
December
5.4
4
5
6
6
Average
6.0
6.4
6.2
6.1
6.0
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
273°
262°
064°
212°
264°
February
266°
274°
065°
268°
012°
March
265°
259°
294°
260°
255°
April
278°
267°
267°
258°
May
268°
270°
270°
248°
June
268°
256°
255°
278°
July
266°
272°
280°
258°
August
257°
312°
270°
252°
September
264°
064°
271°
053°
October
057°
067°
250°
029°
November
017°
263°
066°
263°
December
263°
255°
261°
045°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.