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
74.1
70
63
85
77
77
February
83.7
92
90
83
87
81
March
85.4
80
82
90
94
82
April
90.6
91
94
90
92
88
May
91.5
97
92
88
92
June
92.1
86
96
93
97
July
93.5
90
94
92
96
August
93.3
96
95
91
93
September
92.6
96
91
93
91
October
87.4
85
95
80
85
November
90.3
89
88
96
99
December
80.3
81
77
85
77
Average
86.8
83.5
87.5
90.6
88.7
88.8
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
1.6
1
5
0
1
4
February
5.0
8
9
5
-1
3
March
8.8
11
7
12
13
10
April
14.9
17
16
15
16
12
May
20.3
21
24
19
19
June
24.9
24
27
25
25
July
27.2
27
28
26
30
August
26.3
24
28
28
27
September
23.1
22
23
24
22
October
16.5
16
17
19
15
November
9.5
10
11
9
16
December
4.3
7
4
7
4
Average
13.2
9.2
14.8
16.5
15.2
15.4
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
-5.0
-4
-1
-10
-4
-2
February
-5.7
-2
-3
-7
-8
-4
March
-1.2
1
-1
-1
0
2
April
4.9
7
4
3
4
3
May
9.4
7
11
8
9
June
14.0
12
13
15
15
July
17.5
17
16
17
18
August
16.0
15
16
17
15
September
12.8
12
12
13
11
October
6.8
8
4
11
7
November
0.9
0
1
0
4
December
-2.1
1
-2
0
-2
Average
4.2
0.3
5.1
5.0
5.8
6.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.7
0
0
0
0
0
February
3.9
0
0
0
0
0
March
4.8
0
0
0
0
0
April
0.5
0
0
0
0
0
May
0.6
0
0
0
0
June
0.3
0
0
0
0
July
1.2
0
0
0
0
August
0.2
0
0
0
0
September
0.0
0
0
0
0
October
0.1
0
0
0
0
November
0.0
0
0
0
0
December
4.6
0
0
0
0
Average
3.6
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
5
6
6
6
February
6.5
6
7
6
7
6
March
7.2
7
8
7
7
7
April
6.4
7
6
7
6
7
May
5.5
5
6
5
7
June
4.8
5
5
4
5
July
4.1
4
5
4
4
August
3.6
4
4
3
3
September
4.3
4
4
5
4
October
5.2
5
6
4
5
November
6.0
6
6
5
6
December
5.6
5
6
6
6
Average
5.7
6.5
5.5
5.4
5.2
5.2
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
246°
249°
268°
268°
248°
February
265°
250°
252°
273°
264°
March
254°
271°
255°
276°
253°
April
269°
253°
253°
273°
278°
May
353°
150°
312°
263°
June
333°
279°
274°
272°
July
275°
269°
286°
291°
August
283°
269°
291°
284°
September
034°
282°
259°
232°
October
263°
253°
217°
261°
November
254°
239°
252°
241°
December
238°
210°
233°
240°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.