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
87.6
80
85
96
89
100
February
93.0
87
95
100
90
March
86.1
94
84
93
88
68
April
95.7
95
98
94
96
95
May
89.4
90
94
88
87
June
98.9
99
99
99
99
July
93.7
90
94
96
95
August
97.0
96
97
98
97
September
95.0
91
96
97
96
October
95.1
92
100
94
95
November
95.4
91
98
97
97
December
93.4
89
91
99
94
Average
93.9
89.5
91.8
96.0
94.1
92.2
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
4.1
2
2
7
6
-1
February
7.1
13
7
8
1
March
13.6
15
10
14
15
14
April
20.0
21
21
21
19
20
May
23.7
25
25
22
23
June
31.3
28
33
32
34
July
33.2
32
35
33
33
August
33.8
33
35
35
33
September
30.2
30
31
32
28
October
20.3
20
23
22
18
November
15.1
16
12
17
17
December
9.1
9
7
12
9
Average
14.8
12.4
19.3
21.4
20.5
22.7
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
-8.3
-10
-7
-9
-6
-1
February
-8.6
-2
-7
-9
-11
March
-2.5
-1
-3
-4
-1
1
April
2.5
5
2
3
2
1
May
9.9
12
9
10
9
June
16.4
15
17
16
18
July
18.4
16
20
18
19
August
15.5
12
17
17
17
September
12.2
13
13
13
10
October
4.0
4
5
5
2
November
-3.9
-2
-5
0
-1
December
-6.4
-4
-8
-6
-6
Average
3.5
-3.7
4.2
4.5
4.8
6.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
8.1
7
7
10
9
7
February
8.7
8
8
11
7
March
10.0
9
9
11
10
10
April
12.1
12
12
16
11
10
May
9.1
8
10
9
9
June
9.2
7
9
8
13
July
8.0
6
9
8
9
August
8.1
7
7
9
9
September
8.2
7
7
9
9
October
8.6
8
8
10
8
November
9.0
7
9
9
11
December
9.2
8
11
9
10
Average
9.2
9.2
7.9
9.9
9.1
9.6
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
336°
339°
301°
327°
360°
February
309°
313°
329°
001°
March
010°
346°
344°
350°
180°
April
332°
298°
308°
336°
333°
May
142°
310°
135°
081°
June
141°
175°
158°
171°
July
125°
143°
152°
150°
August
202°
138°
148°
157°
September
183°
143°
160°
252°
October
320°
292°
332°
340°
November
318°
301°
307°
258°
December
321°
298°
299°
315°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.