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
94.1
90
94
92
97
100
February
87.5
87
91
87
80
91
March
90.4
87
87
91
97
87
April
91.3
93
90
98
89
93
May
93.5
100
99
87
96
June
97.9
97
100
99
96
July
99.2
100
97
100
100
August
98.3
100
100
95
100
September
96.0
94
99
99
95
October
90.8
92
95
98
78
November
92.2
96
89
99
92
December
94.4
99
93
90
91
Average
93.3
89.2
95.0
95.2
94.0
93.7
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
3.3
1
4
4
6
3
February
2.0
4
3
3
-6
6
March
6.6
7
2
10
11
7
April
12.1
14
12
12
13
12
May
17.0
21
16
16
17
June
22.8
22
23
27
22
July
29.2
30
29
33
27
August
29.2
29
32
27
30
September
23.7
24
27
24
24
October
12.1
13
16
14
9
November
6.9
10
1
11
8
December
3.9
9
-4
1
6
Average
12.0
6.2
14.7
14.5
14.4
14.3
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
-7.2
-11
-4
-8
-2
-7
February
-9.9
-6
-6
-9
-15
-4
March
-5.5
-5
-7
-2
-2
-5
April
0.1
2
0
0
0
-2
May
5.1
9
4
4
5
June
9.4
12
8
10
9
July
11.6
11
10
14
11
August
12.5
13
14
12
12
September
8.8
9
11
8
7
October
1.3
2
5
3
-2
November
-3.0
0
-9
0
-1
December
-7.9
-2
-13
-11
-4
Average
0.2
-6.8
3.0
1.2
1.4
1.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.7
16
9
11
6
5
February
19.3
24
12
19
30
14
March
12.7
12
22
16
7
12
April
14.3
11
16
6
17
14
May
9.7
10
5
15
6
June
6.5
4
7
4
12
July
2.3
1
4
2
3
August
2.5
2
1
5
2
September
5.7
9
7
0
3
October
12.0
12
8
7
22
November
12.5
5
25
0
8
December
9.0
1
23
18
3
Average
10.5
15.2
8.5
10.0
9.2
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
11.0
8
11
12
13
12
February
11.0
8
13
12
8
13
March
8.4
6
7
10
10
11
April
9.9
9
10
12
10
10
May
7.7
5
11
7
8
June
7.3
5
9
6
8
July
6.2
6
6
5
7
August
7.0
7
7
8
7
September
7.5
7
7
8
8
October
9.3
7
8
12
10
November
11.2
11
9
16
14
December
10.4
10
8
11
10
Average
8.9
7.8
8.1
9.2
9.1
9.5
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
241°
235°
238°
245°
245°
February
228°
249°
248°
256°
253°
March
275°
253°
253°
238°
254°
April
263°
233°
245°
263°
262°
May
222°
248°
264°
247°
June
199°
248°
281°
252°
July
242°
245°
314°
240°
August
248°
267°
269°
250°
September
250°
261°
255°
260°
October
251°
245°
236°
254°
November
237°
239°
241°
238°
December
236°
247°
246°
240°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.