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
96.0
96
96
99
97
97
February
95.9
96
96
94
97
98
March
97.1
93
98
99
97
98
April
99.2
100
99
99
100
May
98.6
99
99
97
100
June
99.9
100
100
100
100
July
98.7
100
100
100
99
August
99.4
100
99
100
100
September
99.0
99
99
98
98
October
99.3
100
100
100
98
November
98.7
100
99
100
97
December
96.6
95
99
100
96
Average
97.5
95.3
98.3
98.8
98.7
98.4
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
1.2
3
1
4
1
0
February
3.7
6
4
3
3
4
March
8.6
8
7
10
8
11
April
14.3
14
15
15
15
May
19.1
19
22
19
22
June
24.8
23
25
26
25
July
27.3
30
26
28
27
August
26.6
27
26
22
28
September
23.5
23
25
24
23
October
15.5
18
15
15
19
November
8.1
10
6
12
9
December
2.3
3
3
5
1
Average
12.3
5.3
15.0
15.2
13.9
15.2
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
-11.1
-9
-11
-11
-11
-11
February
-9.3
-6
-11
-12
-9
-8
March
-5.8
-5
-7
-5
-5
-4
April
-1.2
-3
-1
-2
-1
May
3.3
4
3
3
4
June
7.6
6
9
8
8
July
10.9
11
12
12
11
August
10.2
10
10
16
11
September
6.4
5
7
8
6
October
0.0
1
0
0
0
November
-6.8
-6
-8
-3
-4
December
-9.1
-9
-10
-9
-11
Average
-2.7
-7.2
-1.2
-1.7
-1.2
0.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.8
7
6
2
4
3
February
5.0
4
5
7
5
3
March
4.0
11
4
2
4
3
April
1.8
2
3
2
1
May
3.4
3
3
5
2
June
1.6
2
2
2
2
July
1.2
2
0
2
2
August
0.5
2
0
0
0
September
0.3
0
0
1
1
October
1.7
2
0
2
2
November
0.8
0
1
0
1
December
2.6
4
0
1
4
Average
3.1
6.4
2.6
1.5
2.5
1.7
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
6.7
9
7
7
7
7
February
7.6
8
8
7
9
10
March
8.2
7
10
10
8
9
April
9.7
11
13
10
11
May
8.1
8
11
8
9
June
7.7
9
8
8
10
July
6.2
8
7
7
7
August
5.7
7
7
6
7
September
4.9
7
7
7
8
October
7.3
8
8
8
9
November
6.7
7
9
8
7
December
7.0
8
8
8
7
Average
7.0
8.4
8.2
8.3
8.0
8.5
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
292°
297°
305°
322°
325°
February
284°
286°
273°
307°
316°
March
255°
259°
300°
287°
279°
April
279°
281°
298°
310°
May
218°
265°
286°
285°
June
246°
232°
267°
252°
July
260°
265°
257°
277°
August
244°
221°
171°
280°
September
200°
231°
255°
283°
October
254°
276°
267°
294°
November
256°
280°
289°
284°
December
296°
287°
269°
321°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.