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
87.9
84
88
94
86
87
February
89.0
96
99
94
91
78
March
93.7
94
91
100
96
91
April
93.3
96
99
98
97
97
May
92.8
97
95
95
79
June
84.5
91
100
97
17
July
93.9
94
97
97
83
August
95.9
98
95
94
96
September
95.2
98
95
95
96
October
93.1
94
99
92
87
November
92.9
97
90
94
95
December
89.8
87
88
92
87
Average
92.0
92.6
94.4
95.9
93.9
81.7
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
3.6
3
7
1
3
6
February
7.3
11
12
6
1
5
March
11.6
14
12
14
15
13
April
17.0
19
19
16
18
15
May
23.0
23
24
21
20
June
27.2
26
29
28
28
July
29.5
32
29
29
31
August
27.9
28
28
30
28
September
25.6
26
24
26
25
October
19.2
19
19
21
17
November
10.7
13
13
11
14
December
6.6
9
6
11
5
Average
16.7
11.8
18.7
17.8
17.7
17.1
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
-4.4
-3
0
-7
-3
-1
February
-3.8
-1
0
-4
-7
-3
March
1.0
3
0
2
2
4
April
5.7
9
6
6
6
4
May
11.8
11
14
9
10
June
16.1
15
17
18
17
July
18.0
16
20
19
19
August
17.6
17
17
19
17
September
13.9
14
14
15
13
October
8.3
9
6
12
7
November
0.9
2
2
0
3
December
-2.8
2
-1
1
-2
Average
6.6
2.1
7.5
7.4
7.6
7.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.7
23
12
12
13
18
February
11.7
4
6
15
12
21
March
9.1
9
8
4
3
12
April
7.4
6
5
12
8
11
May
7.3
7
8
7
12
June
4.6
4
1
6
3
July
3.5
4
6
3
2
August
2.6
3
1
4
3
September
4.2
2
4
4
2
October
5.9
5
3
7
10
November
8.1
6
9
8
10
December
10.5
8
8
9
15
Average
7.5
9.7
5.6
6.5
6.5
9.2
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
7.7
8
7
8
7
7
February
8.3
8
9
8
8
8
March
9.0
9
9
10
9
9
April
8.2
9
8
9
8
9
May
6.6
6
7
6
8
June
6.8
7
6
7
7
July
5.5
5
6
6
5
August
5.3
6
6
5
5
September
5.7
5
6
7
6
October
7.0
7
8
7
6
November
7.6
8
8
7
8
December
7.1
6
6
7
7
Average
7.2
8.5
6.7
7.2
6.8
7.0
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
243°
234°
246°
252°
237°
February
250°
235°
231°
300°
256°
March
249°
254°
236°
248°
250°
April
242°
241°
233°
241°
270°
May
017°
184°
283°
231°
June
346°
247°
211°
230°
July
230°
230°
246°
235°
August
254°
234°
221°
232°
September
042°
275°
236°
183°
October
250°
241°
209°
222°
November
227°
225°
228°
236°
December
221°
244°
211°
234°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.