Cashville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cashville clear sky chart from 2005-11-05 to 2017-10-31.

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
40%
15531
20%
47398
12%
15494
49%
15494
22%
30522

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 15thNight
25%
717
19%
2440
9%
716
39%
716
16%
1583
January16th to endNight
23%
768
20%
2496
7%
768
38%
768
17%
1642
February1st to 15thNight
24%
701
20%
2243
9%
701
38%
701
19%
1395
February16th to endNight
26%
631
25%
1893
11%
631
44%
631
23%
1177
March1st to 15thNight
31%
720
20%
2058
12%
720
41%
720
23%
1335
March16th to endNight
31%
768
21%
2049
9%
768
41%
768
22%
1391
April1st to 15thNight
35%
718
20%
1796
7%
718
42%
718
27%
1197
April16th to endNight
44%
720
19%
1800
8%
720
49%
720
28%
1203
May1st to 15thNight
39%
635
16%
1715
8%
635
43%
635
22%
1194
May16th to endNight
51%
374
17%
1497
16%
374
58%
374
19%
883
June1st to 15thNight
53%
360
15%
1440
17%
360
56%
360
21%
847
June16th to endNight
53%
360
15%
1440
14%
360
59%
360
19%
859
July1st to 15thNight
60%
340
12%
1360
15%
340
61%
340
17%
859
July16th to endNight
61%
517
18%
1548
15%
484
67%
484
28%
936
August1st to 15thNight
60%
605
13%
1675
9%
602
61%
602
24%
1132
August16th to endNight
64%
764
19%
1910
11%
764
66%
764
30%
1292
September1st to 15thNight
59%
720
23%
1800
15%
720
61%
720
31%
1215
September16th to endNight
51%
717
19%
1941
13%
717
56%
717
22%
1341
October1st to 15thNight
48%
720
22%
2160
19%
720
53%
720
24%
1388
October16th to endNight
41%
768
28%
2303
21%
768
52%
768
28%
1407
November1st to 15thNight
33%
700
20%
2256
12%
700
45%
700
21%
1408
November16th to endNight
34%
720
21%
2370
13%
720
45%
720
19%
1492
December1st to 15thNight
27%
720
17%
2520
9%
720
39%
720
14%
1647
December16th to endNight
20%
768
22%
2688
8%
768
38%
768
15%
1699

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
12%5%2442445%8%44%
48341
Night
13%6%25%43445%7%42%
47581
Cloud CoverDay
12%5%2442445%8%44%
48351
Night
13%5%25%42445%7%42%
47585
TransparencyDay
37%6%13%23%15%2
48042
Night
40%6%11%22%15%2
47398
SeeingDay
14%11%16%25%24%7%
6013
Night
14%19%19%25%17%3
15538

By Month

Percentage Cloud Cover NE (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 15thDay
14%7%45%424446%40%
1495
16th to endDay
15%6%36%6%23345%41%
1728
February1st to 15thDay
15%7%35%5%23446%40%
1618
16th to endDay
14%6%245%2445%6%43%
1580
March1st to 15thDay
15%5%24324347%46%
1888
16th to endDay
16%6%24423337%46%
2175
April1st to 15thDay
12%423324447%50%
2152
16th to endDay
11%6%23323446%49%
2160
May1st to 15thDay
12%5%25%33445%7%44%
2246
16th to endDay
12%41342345%9%47%
2618
June1st to 15thDay
10%31332446%11%48%
2520
16th to endDay
5%424435%5%5%11%45%
2520
July1st to 15thDay
7%4145%36%5%7%11%43%
2520
16th to endDay
6%324426%7%8%12%41%
2510
August1st to 15thDay
10%6%25%42446%11%40%
2259
16th to endDay
10%42443446%9%44%
2292
September1st to 15thDay
13%5%2432345%8%45%
2160
16th to endDay
15%7%26%43445%7%37%
2016
October1st to 15thDay
14%5%25%434445%44%
1800
16th to endDay
13%425%424345%49%
1920
November1st to 15thDay
16%6%24324446%44%
1600
16th to endDay
13%5%24423447%46%
1588
December1st to 15thDay
13%7%25%4345%5%7%40%
1440
16th to endDay
20%8%25%423445%38%
1536
January1st to 15thNight
14%6%37%5%35%45%7%37%
2440
16th to endNight
16%7%37%423336%40%
2496
February1st to 15thNight
16%7%25%324346%43%
2242
16th to endNight
14%5%34334346%46%
1893
March1st to 15thNight
16%5%24434446%44%
2046
16th to endNight
18%5%35%423346%42%
2049
April1st to 15thNight
12%5%25%4345%47%44%
1796
16th to endNight
15%423424247%47%
1800
May1st to 15thNight
13%7%35%4345%5%7%38%
1715
16th to endNight
12%6%2432445%9%44%
1495
June1st to 15thNight
10%5%1442446%10%43%
1440
16th to endNight
7%5%15%5%46%5%5%9%42%
1440
July1st to 15thNight
6%426%6%46%6%6%10%38%
1440
16th to endNight
6%4245%35%5%7%10%41%
1655
August1st to 15thNight
7%437%7%45%5%7%8%39%
1686
16th to endNight
9%426%5%245%6%10%42%
1910
September1st to 15thNight
12%4245%245%5%7%45%
1800
16th to endNight
15%6%25%435%5%5%8%38%
1941
October1st to 15thNight
14%5%25%434446%43%
2160
16th to endNight
16%5%24322435%48%
2303
November1st to 15thNight
15%6%35%323346%45%
2256
16th to endNight
14%7%35%424347%42%
2370
December1st to 15thNight
16%6%26%434445%38%
2520
16th to endNight
17%7%25%423346%40%
2688

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 15thDay
15%6%46%424446%40%
1495
16th to endDay
15%6%35%5%23445%41%
1728
February1st to 15thDay
15%8%25%6%235%5%6%39%
1618
16th to endDay
14%5%245%2446%5%43%
1580
March1st to 15thDay
15%5%13423447%46%
1899
16th to endDay
16%5%24423335%46%
2174
April1st to 15thDay
12%423323447%50%
2152
16th to endDay
12%424414347%49%
2160
May1st to 15thDay
13%4244245%5%7%44%
2246
16th to endDay
12%41332345%9%47%
2618
June1st to 15thDay
10%31332446%11%47%
2520
16th to endDay
6%4245%35%5%5%11%45%
2520
July1st to 15thDay
7%4245%36%5%7%11%43%
2520
16th to endDay
6%324435%7%7%12%40%
2510
August1st to 15thDay
11%5%244335%6%10%40%
2259
16th to endDay
10%4245%25%46%9%42%
2292
September1st to 15thDay
13%5%2432445%7%45%
2160
16th to endDay
16%7%35%5%245%5%7%36%
2016
October1st to 15thDay
15%5%25%5%24346%44%
1800
16th to endDay
12%425%5%23435%50%
1920
November1st to 15thDay
16%5%25%414347%44%
1600
16th to endDay
14%4245%23447%45%
1588
December1st to 15thDay
13%7%25%33345%8%41%
1440
16th to endDay
20%7%35%433445%38%
1536
January1st to 15thNight
14%5%46%5%35%5%47%38%
2440
16th to endNight
16%6%35%5%34435%40%
2496
February1st to 15thNight
15%7%24324346%44%
2235
16th to endNight
14%5%34424346%46%
1893
March1st to 15thNight
15%6%14334446%44%
2058
16th to endNight
18%6%25%423345%42%
2049
April1st to 15thNight
12%5%25%5%245%5%6%44%
1796
16th to endNight
15%5%24333337%47%
1800
May1st to 15thNight
14%7%36%4245%5%8%38%
1714
16th to endNight
12%7%23325%45%8%44%
1495
June1st to 15thNight
10%425%42446%10%42%
1440
16th to endNight
6%5%25%5%36%5%6%9%42%
1440
July1st to 15thNight
6%5%26%6%46%6%7%10%37%
1440
16th to endNight
7%335%435%6%6%11%42%
1655
August1st to 15thNight
6%5%27%6%45%5%7%8%39%
1686
16th to endNight
9%4245%35%5%6%10%42%
1910
September1st to 15thNight
12%4245%245%47%45%
1800
16th to endNight
15%5%35%44445%8%38%
1941
October1st to 15thNight
15%5%25%43345%7%44%
2160
16th to endNight
16%5%14313345%49%
2303
November1st to 15thNight
15%5%25%423336%45%
2256
16th to endNight
14%6%35%5%2435%6%43%
2370
December1st to 15thNight
16%7%26%5%35%445%38%
2520
16th to endNight
16%8%35%42335%6%41%
2688

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 15thDay
43%6%12%20%14%2
1496
16th to endDay
43%5%11%22%14%3
1728
February1st to 15thDay
43%410%23%14%3
1621
16th to endDay
39%5%11%25%15%2
1580
March1st to 15thDay
38%5%13%23%16%3
1899
16th to endDay
39%5%11%23%16%3
2175
April1st to 15thDay
33%5%11%27%17%4
2152
16th to endDay
35%5%10%22%18%6%
2160
May1st to 15thDay
38%8%13%23%13%1
2246
16th to endDay
32%8%16%26%14%1
2622
June1st to 15thDay
29%8%17%29%13%
2520
16th to endDay
32%7%17%23%15%2
2520
July1st to 15thDay
32%10%17%23%13%2
2371
16th to endDay
31%10%16%24%15%1
2354
August1st to 15thDay
36%7%16%24%13%1
2246
16th to endDay
36%7%13%24%16%2
2292
September1st to 15thDay
36%6%13%22%18%2
2160
16th to endDay
45%6%9%18%19%
2016
October1st to 15thDay
40%5%9%25%17%2
1800
16th to endDay
35%5%9%27%18%3
1920
November1st to 15thDay
40%5%11%19%18%3
1600
16th to endDay
37%5%12%23%16%3
1588
December1st to 15thDay
40%6%14%21%14%2
1440
16th to endDay
46%5%9%22%13%1
1536
January1st to 15thNight
44%6%11%21%13%2
2440
16th to endNight
45%410%23%13%2
2496
February1st to 15thNight
41%47%26%17%2
2243
16th to endNight
38%49%25%18%3
1893
March1st to 15thNight
40%5%10%26%14%3
2058
16th to endNight
43%48%23%15%3
2049
April1st to 15thNight
38%5%11%21%18%4
1796
16th to endNight
38%5%10%19%20%5%
1800
May1st to 15thNight
43%7%13%21%12%1
1715
16th to endNight
36%8%16%24%13%
1497
June1st to 15thNight
35%9%16%24%13%
1440
16th to endNight
36%9%16%18%16%1
1440
July1st to 15thNight
38%11%16%18%12%1
1360
16th to endNight
32%10%16%26%13%1
1548
August1st to 15thNight
39%10%16%19%14%
1675
16th to endNight
35%9%14%23%14%1
1910
September1st to 15thNight
36%8%13%20%17%3
1800
16th to endNight
43%7%9%18%17%2
1941
October1st to 15thNight
40%5%10%24%15%2
2160
16th to endNight
37%49%26%19%3
2303
November1st to 15thNight
40%411%21%17%4
2256
16th to endNight
40%5%9%23%15%4
2370
December1st to 15thNight
45%6%12%19%14%1
2520
16th to endNight
43%5%11%22%13%3
2688

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 15thDay
18%7%32%38%4
71
16th to endDay
25%6%31%27%10%
96
February1st to 15thDay
18%17%26%30%5%
134
16th to endDay
13%19%29%27%9%
239
March1st to 15thDay
15%17%27%30%10%
270
16th to endDay
13%17%26%29%10%2
288
April1st to 15thDay
11%16%24%27%18%1
270
16th to endDay
15%14%14%31%22%2
270
May1st to 15thDay
20%13%20%27%14%3
288
16th to endDay
18%10%11%24%22%13%
331
June1st to 15thDay
12%11%7%25%27%15%
315
16th to endDay
6%10%10%32%32%8%
315
July1st to 15thDay
7%7%6%23%43%9%
305
16th to endDay
8%9%416%48%12%
326
August1st to 15thDay
13%6%7%25%35%11%
313
16th to endDay
8%5%6%20%41%16%
332
September1st to 15thDay
13%6%12%24%31%12%
315
16th to endDay
21%7%14%20%27%8%
314
October1st to 15thDay
18%8%12%29%22%9%
315
16th to endDay
13%9%23%24%21%8%
336
November1st to 15thDay
19%14%26%19%16%3
238
16th to endDay
16%20%21%22%15%3
208
December1st to 15thDay
15%13%16%36%18%
60
16th to endDay
35%428%21%9%
64
January1st to 15thNight
15%27%26%22%7%
720
16th to endNight
17%25%30%23%3
768
February1st to 15thNight
17%25%28%24%3
704
16th to endNight
15%24%30%26%3
631
March1st to 15thNight
17%23%25%24%9%
720
16th to endNight
19%21%23%24%8%1
768
April1st to 15thNight
12%19%26%30%9%
718
16th to endNight
15%18%16%32%14%1
720
May1st to 15thNight
15%19%20%30%11%1
635
16th to endNight
12%18%12%27%24%4
375
June1st to 15thNight
9%17%11%29%26%5%
360
16th to endNight
5%16%11%32%29%3
360
July1st to 15thNight
8%12%8%31%33%5%
340
16th to endNight
6%17%7%26%35%6%
517
August1st to 15thNight
10%9%7%31%36%5%
605
16th to endNight
9%8%6%27%38%9%
764
September1st to 15thNight
12%9%10%25%34%8%
720
16th to endNight
17%10%12%24%29%5%
717
October1st to 15thNight
17%13%14%28%21%4
720
16th to endNight
16%14%22%25%16%4
768
November1st to 15thNight
16%21%24%20%12%4
700
16th to endNight
15%25%20%23%12%1
720
December1st to 15thNight
18%23%25%19%11%1
720
16th to endNight
17%28%28%20%4
768
Page generated at 2017-11-01 17:23:32. Version ac04

Copyright 2017 A. Danko


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