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
93.9
90
94
99
96
93
February
94.0
93
91
92
95
94
March
94.5
90
91
90
99
99
April
96.8
98
96
88
99
98
May
98.2
100
94
100
100
June
98.6
100
93
100
100
July
96.2
99
99
100
99
August
77.1
14
99
100
100
September
99.1
99
98
99
99
October
97.9
99
98
100
97
November
97.3
94
97
100
99
December
94.4
86
95
98
97
Average
94.9
92.9
88.3
94.9
98.8
98.1
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
4.3
4
4
5
4
3
February
6.5
8
6
5
6
7
March
11.5
11
9
12
12
12
April
17.8
18
17
18
18
18
May
22.7
22
24
22
25
June
27.9
26
28
28
29
July
29.1
33
29
29
30
August
28.6
29
27
29
31
September
25.6
25
26
27
25
October
17.9
20
16
18
20
November
11.3
12
8
15
12
December
5.7
5
5
8
4
Average
16.7
10.5
17.4
17.2
17.9
17.9
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
-11.1
-9
-10
-11
-11
-12
February
-8.0
-6
-9
-12
-7
-7
March
-4.2
-4
-4
-5
-4
-2
April
-2.6
-2
-3
-1
-2
-1
May
4.1
5
5
4
4
June
8.5
6
10
9
9
July
11.7
13
13
12
12
August
10.8
12
12
11
11
September
6.9
7
8
7
5
October
-1.7
1
1
0
-1
November
-6.2
-6
-8
-5
-4
December
-10.5
-9
-10
-8
-12
Average
-1.6
-6.9
0.2
0.6
0.5
0.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.6
17
13
3
6
5
February
10.0
10
18
12
10
5
March
10.6
16
20
15
3
5
April
3.1
5
6
1
3
0
May
2.5
4
1
5
1
June
3.3
1
9
5
2
July
1.6
1
2
2
2
August
1.8
0
4
2
1
September
2.1
3
3
1
0
October
4.6
1
10
4
4
November
4.1
6
9
0
1
December
5.8
12
5
7
4
Average
5.2
12.0
6.6
6.0
3.7
2.4
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
6.1
7
8
5
6
5
February
8.1
8
9
6
8
7
March
9.3
9
11
9
10
8
April
10.4
10
10
12
10
10
May
9.9
8
13
9
10
June
8.5
10
9
7
9
July
6.8
8
6
7
7
August
6.8
7
6
7
7
September
7.0
7
6
7
7
October
7.9
8
7
8
8
November
6.6
6
7
6
7
December
6.6
6
7
8
6
Average
7.9
8.6
8.2
7.8
7.7
7.6
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
267°
253°
272°
264°
288°
February
269°
264°
259°
253°
255°
March
238°
247°
286°
251°
251°
April
255°
263°
256°
257°
258°
May
219°
255°
236°
252°
June
246°
235°
210°
249°
July
269°
210°
134°
269°
August
234°
107°
246°
298°
September
252°
228°
241°
314°
October
246°
249°
260°
253°
November
269°
260°
259°
244°
December
284°
243°
252°
324°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.