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
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
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
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
8.9
7
10
10
9
9
February
10.9
18
12
11
3
10
March
16.9
21
15
17
17
16
April
21.5
23
24
20
22
May
24.0
27
27
23
25
June
32.4
31
33
33
34
July
34.3
34
37
34
34
August
33.2
35
36
35
32
September
30.3
31
33
32
27
October
22.4
25
25
24
20
November
15.3
17
14
17
17
December
11.1
13
10
16
10
Average
20.9
15.0
22.6
23.3
22.2
21.3
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
-5.5
-5
-3
-8
-3
-3
February
-4.5
2
-4
-6
-9
-3
March
2.7
4
1
1
4
5
April
6.4
6
8
6
6
May
12.5
14
14
12
12
June
18.7
18
19
20
19
July
21.1
21
22
20
22
August
19.8
20
20
21
19
September
16.9
17
16
18
14
October
7.7
9
7
10
6
November
1.4
2
0
3
4
December
-3.9
1
-2
-1
-3
Average
7.1
0.0
8.6
8.0
8.6
8.0
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
0
March
0.0
0
0
0
0
0
April
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
8.8
8
8
9
10
9
February
9.7
10
9
11
10
10
March
11.0
10
12
12
11
9
April
11.4
11
13
12
10
May
8.9
8
10
9
9
June
8.5
6
9
8
11
July
7.3
7
7
7
7
August
7.3
6
7
9
7
September
8.6
8
8
9
8
October
9.5
10
8
9
9
November
9.3
8
11
9
9
December
8.5
9
8
8
8
Average
9.1
9.4
8.3
9.5
9.1
8.9
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
343°
334°
351°
340°
359°
February
314°
296°
357°
023°
357°
March
360°
015°
346°
179°
134°
April
213°
209°
014°
019°
May
140°
118°
128°
064°
June
119°
169°
169°
185°
July
168°
154°
151°
144°
August
164°
160°
168°
146°
September
152°
157°
170°
133°
October
062°
181°
345°
079°
November
155°
018°
101°
178°
December
318°
238°
219°
337°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.