Towns County Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Towns County Park clear sky chart from 2005-11-06 to 2024-03-06.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
47%
24081
19%
79919
14%
23975
53%
23975
21%
51643

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
25%
755
20%
4015
10%
737
38%
737
10%
2439
January11th to 20thNight
27%
756
23%
3958
10%
740
39%
740
11%
2340
January21st to endNight
25%
832
15%
4464
11%
814
40%
814
10%
3000
February1st to 10thNight
33%
760
23%
2280
14%
760
42%
760
22%
1482
February11th to 20thNight
21%
742
18%
2218
7%
739
33%
739
16%
1547
February21st to endNight
20%
628
18%
1884
7%
628
30%
628
16%
1342
March1st to 10thNight
31%
743
22%
2154
13%
743
39%
743
21%
1437
March11th to 20thNight
32%
720
17%
1980
9%
720
39%
720
20%
1379
March21st to endNight
33%
792
17%
2178
9%
792
40%
792
21%
1508
April1st to 10thNight
38%
712
22%
1972
13%
712
46%
712
28%
1237
April11th to 20thNight
44%
533
24%
1762
18%
533
53%
533
26%
1044
April21st to endNight
50%
540
25%
1620
18%
540
56%
540
29%
1000
May1st to 10thNight
51%
540
17%
1620
10%
540
56%
540
26%
1031
May11th to 20thNight
54%
531
13%
1593
9%
531
57%
531
22%
1076
May21st to endNight
66%
582
16%
1744
13%
582
67%
582
27%
1140
June1st to 10thNight
62%
540
14%
1620
12%
540
63%
540
24%
1086
June11th to 20thNight
73%
540
13%
1620
11%
540
74%
540
33%
988
June21st to endNight
72%
540
15%
1620
13%
540
72%
540
29%
1037
July1st to 10thNight
67%
525
11%
1575
10%
525
67%
525
22%
1108
July11th to 20thNight
69%
522
10%
1566
9%
522
69%
522
23%
1075
July21st to endNight
73%
591
13%
1672
11%
558
74%
558
25%
1129
August1st to 10thNight
69%
537
11%
1600
10%
534
69%
534
24%
1103
August11th to 20thNight
67%
534
17%
1650
17%
534
67%
534
24%
1127
August21st to endNight
65%
594
16%
1980
17%
594
66%
594
23%
1330
September1st to 10thNight
64%
710
18%
1970
16%
710
64%
710
27%
1309
September11th to 20thNight
60%
720
20%
1980
17%
720
62%
720
26%
1340
September21st to endNight
64%
720
25%
1980
20%
720
67%
720
32%
1237
October1st to 10thNight
56%
720
28%
1980
22%
720
62%
720
36%
1175
October11th to 20thNight
47%
720
25%
2119
19%
720
55%
720
29%
1296
October21st to endNight
50%
792
31%
2376
25%
792
59%
792
30%
1402
November1st to 10thNight
52%
740
28%
2377
24%
740
61%
740
32%
1339
November11th to 20thNight
43%
760
26%
2470
20%
760
53%
760
25%
1470
November21st to endNight
41%
760
23%
2470
18%
760
50%
760
23%
1549
December1st to 10thNight
32%
760
20%
2470
12%
760
42%
760
16%
1704
December11th to 20thNight
36%
759
23%
2941
16%
758
45%
758
17%
1833
December21st to endNight
29%
831
11%
4441
11%
817
37%
817
9%
3004

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
14%7%36%6%35%5%6%7%37%
78897
Night
13%8%36%5%35%45%7%40%
80639
TransparencyDay
44%8%11%17%16%4
78620
Night
41%7%12%18%17%5%
80435
SeeingDay
19%12%21%21%17%9%
13945
Night
18%11%17%29%21%4
24103

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
16%11%5%6%5%2346%7%36%
2836
11th to 20thDay
15%7%410%6%34345%38%
2840
21st to endDay
20%13%34323345%38%
3125
February1st to 10thDay
18%10%46%5%345%46%37%
1900
11th to 20thDay
21%7%46%6%34446%35%
1848
21st to endDay
23%9%26%5%34445%36%
1570
March1st to 10thDay
17%7%345%2445%7%42%
1922
11th to 20thDay
18%8%37%6%35%5%5%7%34%
1980
21st to endDay
15%10%36%5%35%5%5%6%36%
2178
April1st to 10thDay
13%6%26%5%35%6%6%8%41%
2002
11th to 20thDay
14%6%36%5%45%5%5%7%41%
2147
21st to endDay
13%5%35%6%35%5%5%7%43%
2340
May1st to 10thDay
14%6%35%6%35%5%6%7%40%
2340
11th to 20thDay
13%9%27%7%46%6%6%7%33%
2301
21st to endDay
11%7%36%6%46%6%7%9%34%
2531
June1st to 10thDay
10%6%47%8%48%6%7%9%31%
2340
11th to 20thDay
7%5%36%7%5%7%7%9%9%35%
2340
21st to endDay
9%5%37%8%47%7%8%10%33%
2340
July1st to 10thDay
10%7%48%9%5%7%6%9%11%25%
2340
11th to 20thDay
11%6%37%8%5%8%8%9%10%23%
2340
21st to endDay
10%7%37%8%6%9%8%8%9%26%
2547
August1st to 10thDay
10%7%46%8%48%7%9%10%27%
2327
11th to 20thDay
11%6%48%7%5%6%7%7%11%28%
2247
21st to endDay
13%7%37%7%47%7%8%8%28%
2368
September1st to 10thDay
11%8%36%7%5%6%6%7%8%34%
1980
11th to 20thDay
13%7%27%7%46%5%6%8%35%
1980
21st to endDay
11%6%25%6%45%5%6%7%42%
1980
October1st to 10thDay
11%5%25%5%3445%7%50%
1980
11th to 20thDay
12%7%23424436%52%
1841
21st to endDay
13%5%24433346%52%
1980
November1st to 10thDay
12%5%14324446%56%
1700
11th to 20thDay
12%5%34425%45%7%49%
1710
21st to endDay
15%8%35%5%34446%45%
1710
December1st to 10thDay
21%8%36%4345%6%5%34%
1710
11th to 20thDay
16%8%35%4345%5%5%41%
2153
21st to endDay
16%9%7%7%5%34447%34%
3124
January1st to 10thNight
15%13%45%5%33346%39%
4109
11th to 20thNight
19%10%35%42435%7%38%
4120
21st to endNight
21%14%46%42333435%
4528
February1st to 10thNight
15%8%46%5%3445%7%40%
2280
11th to 20thNight
20%9%46%434445%36%
2218
21st to endNight
23%10%46%434436%34%
1884
March1st to 10thNight
14%9%36%5%35%446%42%
2154
11th to 20thNight
17%8%36%5%345%6%7%36%
1980
21st to endNight
14%8%46%5%3445%7%38%
2178
April1st to 10thNight
13%6%34435%45%7%46%
1972
11th to 20thNight
12%6%35%42445%8%47%
1762
21st to endNight
11%6%35%4346%5%7%46%
1620
May1st to 10thNight
10%6%35%6%35%5%5%8%45%
1620
11th to 20thNight
10%6%38%6%36%5%7%8%38%
1592
21st to endNight
8%6%25%6%47%6%7%10%40%
1744
June1st to 10thNight
8%7%26%7%46%6%8%10%36%
1620
11th to 20thNight
6%6%145%36%5%7%11%46%
1620
21st to endNight
7%6%25%5%36%6%7%11%42%
1620
July1st to 10thNight
9%6%35%8%5%7%6%8%11%32%
1620
11th to 20thNight
8%6%246%5%7%7%10%12%32%
1620
21st to endNight
7%6%35%5%47%7%8%11%35%
1771
August1st to 10thNight
9%5%25%7%45%6%8%12%35%
1611
11th to 20thNight
9%6%26%6%46%6%6%10%38%
1650
21st to endNight
11%6%36%6%46%5%7%10%36%
1980
September1st to 10thNight
8%6%25%7%45%6%7%10%39%
1970
11th to 20thNight
11%7%25%6%45%6%7%9%40%
1980
21st to endNight
8%5%26%4346%6%8%48%
1980
October1st to 10thNight
11%5%34324446%56%
1980
11th to 20thNight
13%6%245%2445%6%49%
2119
21st to endNight
11%7%25%434345%53%
2376
November1st to 10thNight
11%5%3442435%6%53%
2377
11th to 20thNight
14%7%24433445%49%
2470
21st to endNight
15%8%25%4245%5%6%42%
2470
December1st to 10thNight
20%9%46%4345%5%7%34%
2470
11th to 20thNight
14%11%46%42335%6%41%
3042
21st to endNight
15%12%6%9%6%35%45%7%27%
4532

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
44%6%7%14%23%6%
2837
11th to 20thDay
41%9%9%13%22%6%
2840
21st to endDay
46%6%5%15%21%6%
3125
February1st to 10thDay
48%5%7%17%18%5%
1900
11th to 20thDay
49%5%6%16%18%6%
1858
21st to endDay
50%5%8%13%19%6%
1570
March1st to 10thDay
41%5%9%17%21%7%
1922
11th to 20thDay
49%7%9%14%16%5%
1980
21st to endDay
48%6%10%19%15%2
2178
April1st to 10thDay
40%6%11%21%18%4
2002
11th to 20thDay
41%6%10%16%22%5%
2147
21st to endDay
39%6%10%26%16%3
2340
May1st to 10thDay
41%7%13%21%15%3
2340
11th to 20thDay
48%9%13%18%11%1
2305
21st to endDay
43%9%14%21%12%1
2531
June1st to 10thDay
47%9%16%20%6%1
2340
11th to 20thDay
41%10%18%19%11%1
2340
21st to endDay
42%12%17%17%11%2
2340
July1st to 10thDay
50%11%17%16%5%1
2275
11th to 20thDay
50%12%18%11%7%2
2271
21st to endDay
48%11%18%15%7%
2405
August1st to 10thDay
48%13%17%17%5%
2314
11th to 20thDay
47%11%17%16%8%1
2247
21st to endDay
49%12%14%15%8%2
2368
September1st to 10thDay
45%9%12%17%14%3
1980
11th to 20thDay
45%7%12%18%16%2
1980
21st to endDay
40%7%12%16%19%6%
1980
October1st to 10thDay
34%6%10%17%27%6%
1980
11th to 20thDay
34%5%10%20%21%10%
1841
21st to endDay
34%47%20%25%10%
1980
November1st to 10thDay
31%48%16%30%11%
1700
11th to 20thDay
35%46%19%26%9%
1710
21st to endDay
41%5%7%16%25%6%
1710
December1st to 10thDay
50%5%6%17%17%5%
1710
11th to 20thDay
42%5%8%13%23%8%
2150
21st to endDay
44%8%10%19%16%3
3124
January1st to 10thNight
46%5%6%12%25%6%
4109
11th to 20thNight
44%5%8%15%19%9%
4120
21st to endNight
51%6%5%11%19%7%
4528
February1st to 10thNight
43%410%18%20%5%
2280
11th to 20thNight
50%45%16%18%5%
2219
21st to endNight
52%5%8%14%16%5%
1884
March1st to 10thNight
43%5%8%15%19%9%
2154
11th to 20thNight
45%7%11%16%16%4
1980
21st to endNight
46%5%10%22%15%2
2178
April1st to 10thNight
36%5%12%21%21%4
1972
11th to 20thNight
37%49%22%20%6%
1762
21st to endNight
35%7%12%27%17%2
1620
May1st to 10thNight
37%9%15%22%16%2
1620
11th to 20thNight
41%11%17%20%11%1
1593
21st to endNight
37%11%17%24%10%2
1745
June1st to 10thNight
40%11%20%21%7%1
1620
11th to 20thNight
30%10%25%25%9%1
1620
21st to endNight
33%12%19%21%11%3
1620
July1st to 10thNight
42%13%19%18%8%1
1575
11th to 20thNight
39%13%26%13%7%2
1566
21st to endNight
36%14%22%19%7%1
1672
August1st to 10thNight
38%14%22%19%6%
1600
11th to 20thNight
39%12%19%17%12%1
1650
21st to endNight
41%10%20%18%8%2
1980
September1st to 10thNight
37%11%16%18%14%3
1970
11th to 20thNight
40%10%13%20%16%1
1980
21st to endNight
34%8%13%21%19%6%
1980
October1st to 10thNight
31%5%12%18%28%5%
1980
11th to 20thNight
35%6%11%20%20%8%
2119
21st to endNight
34%5%5%21%26%10%
2376
November1st to 10thNight
32%47%21%25%11%
2377
11th to 20thNight
37%5%6%18%24%10%
2470
21st to endNight
41%5%7%20%22%6%
2470
December1st to 10thNight
50%6%7%16%16%5%
2470
11th to 20thNight
41%7%7%14%25%6%
3044
21st to endNight
50%9%10%15%14%2
4532

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
32%22%34%10%2
270
11th to 20thDay
36%21%26%12%5%
270
21st to endDay
28%28%31%9%4
297
February1st to 10thDay
31%21%34%13%1
270
11th to 20thDay
40%26%27%6%1
270
21st to endDay
38%23%30%8%1
225
March1st to 10thDay
28%17%30%19%6%
327
11th to 20thDay
27%18%25%23%6%1
420
21st to endDay
26%20%25%22%6%1
462
April1st to 10thDay
24%13%26%23%12%2
420
11th to 20thDay
17%21%24%22%13%2
412
21st to endDay
20%15%20%24%16%5%
420
May1st to 10thDay
20%15%24%21%14%6%
423
11th to 20thDay
16%7%23%26%17%12%
447
21st to endDay
14%7%20%23%22%14%
485
June1st to 10thDay
14%5%18%25%26%13%
450
11th to 20thDay
9%6%17%23%26%19%
450
21st to endDay
12%420%25%21%17%
450
July1st to 10thDay
10%5%10%24%29%22%
445
11th to 20thDay
8%410%23%30%25%
444
21st to endDay
10%39%23%29%27%
488
August1st to 10thDay
15%5%11%23%21%24%
446
11th to 20thDay
12%5%8%24%31%20%
439
21st to endDay
15%311%22%29%20%
495
September1st to 10thDay
11%412%23%36%15%
450
11th to 20thDay
15%414%22%30%14%
450
21st to endDay
11%6%19%26%29%9%
450
October1st to 10thDay
16%7%20%28%20%9%
450
11th to 20thDay
18%11%22%26%19%4
450
21st to endDay
20%10%25%25%17%2
495
November1st to 10thDay
17%12%33%24%10%4
298
11th to 20thDay
20%22%31%20%6%
270
21st to endDay
16%20%37%17%8%1
270
December1st to 10thDay
35%17%29%14%41
270
11th to 20thDay
27%18%33%16%6%1
270
21st to endDay
30%21%31%14%41
297
January1st to 10thNight
27%16%26%25%6%1
760
11th to 20thNight
25%19%22%26%8%
760
21st to endNight
23%18%28%27%3
836
February1st to 10thNight
22%16%24%33%6%
760
11th to 20thNight
28%18%28%24%2
743
21st to endNight
29%20%25%23%4
628
March1st to 10thNight
21%17%27%29%6%
743
11th to 20thNight
22%17%23%28%9%1
720
21st to endNight
20%16%24%28%11%
792
April1st to 10thNight
18%14%27%30%11%1
712
11th to 20thNight
17%12%21%32%17%2
533
21st to endNight
14%9%21%35%20%2
540
May1st to 10thNight
16%8%19%34%21%2
540
11th to 20thNight
15%6%14%33%27%4
531
21st to endNight
11%310%32%35%8%
584
June1st to 10thNight
11%39%33%36%8%
540
11th to 20thNight
7%47%31%35%16%
540
21st to endNight
9%27%31%41%9%
540
July1st to 10thNight
10%36%22%47%12%
525
11th to 20thNight
10%36%21%43%17%
522
21st to endNight
10%2421%46%17%
591
August1st to 10thNight
10%45%22%45%14%
537
11th to 20thNight
11%36%28%43%9%
534
21st to endNight
14%26%22%43%12%
594
September1st to 10thNight
10%39%28%40%11%
710
11th to 20thNight
15%211%30%35%6%
720
21st to endNight
12%412%34%34%4
720
October1st to 10thNight
15%6%17%28%26%8%
720
11th to 20thNight
17%9%19%31%22%3
720
21st to endNight
15%13%17%34%18%3
792
November1st to 10thNight
13%9%19%34%20%4
740
11th to 20thNight
19%15%19%32%13%3
760
21st to endNight
19%15%18%33%14%1
760
December1st to 10thNight
26%15%21%29%8%1
760
11th to 20thNight
22%15%22%33%8%1
760
21st to endNight
27%15%22%31%5%
836
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