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
84.0
74
87
94
82
77
February
85.4
96
58
93
89
95
March
82.5
94
27
96
85
86
April
92.4
95
84
96
96
90
May
92.9
91
91
92
92
June
96.7
100
97
95
99
July
98.4
99
97
98
98
August
91.2
98
99
99
97
September
88.1
98
96
95
89
October
88.6
95
98
94
86
November
88.0
95
96
100
93
December
90.9
90
87
93
92
Average
90.1
90.1
85.6
95.3
93.2
91.3
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
6.5
3
9
7
6
7
February
8.7
15
7
9
2
9
March
14.0
18
4
15
16
16
April
19.6
21
20
20
19
19
May
23.9
26
24
21
22
June
30.0
31
31
29
32
July
31.9
33
34
30
32
August
29.7
33
34
32
31
September
25.5
31
30
29
26
October
20.1
22
22
22
19
November
12.8
15
12
15
16
December
9.9
11
8
15
10
Average
18.8
14.3
20.0
20.9
19.8
20.1
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
-4.0
-7
-2
-7
-2
-2
February
-3.5
1
-1
-5
-8
-2
March
2.9
5
-1
1
5
5
April
6.7
8
5
6
7
6
May
13.3
13
14
12
12
June
17.7
17
19
16
19
July
20.3
20
20
20
21
August
18.1
19
20
20
18
September
13.3
15
14
16
13
October
8.2
9
7
11
7
November
1.5
2
1
3
4
December
-1.0
1
0
1
-3
Average
7.2
1.7
8.3
7.9
8.5
8.5
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
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
8.4
8
8
9
8
8
February
9.0
10
6
10
9
9
March
9.3
11
3
10
11
9
April
9.5
11
10
13
10
9
May
6.8
6
9
8
8
June
6.6
5
7
7
9
July
6.1
7
7
5
7
August
5.7
6
7
7
6
September
6.4
7
8
7
7
October
8.3
9
9
8
9
November
8.1
8
10
9
10
December
8.2
9
8
9
8
Average
7.9
10.1
6.9
8.8
8.2
8.2
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
275°
251°
309°
270°
295°
February
203°
230°
267°
357°
279°
March
188°
284°
206°
157°
187°
April
183°
210°
184°
219°
221°
May
149°
147°
133°
077°
June
123°
168°
166°
180°
July
182°
158°
156°
165°
August
186°
148°
163°
142°
September
158°
138°
172°
175°
October
250°
222°
231°
212°
November
172°
228°
202°
196°
December
226°
207°
193°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.