Echo Bluff State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Echo Bluff State Park clear sky chart from 2005-11-06 to 2024-01-22.

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
38%
24362
22%
74813
13%
24299
48%
24299
27%
46438

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
20%
950
20%
2568
5%
946
33%
946
21%
1697
January11th to 20thNight
17%
950
22%
2470
5%
950
29%
950
21%
1664
January21st to endNight
20%
1000
22%
2600
5%
1000
31%
1000
24%
1746
February1st to 10thNight
18%
900
18%
2340
4%
900
27%
900
22%
1607
February11th to 20thNight
17%
748
19%
2144
5%
745
27%
745
22%
1376
February21st to endNight
17%
592
22%
1776
6%
592
30%
592
18%
1175
March1st to 10thNight
23%
626
21%
2066
9%
626
34%
626
21%
1294
March11th to 20thNight
26%
540
17%
1980
10%
540
35%
540
16%
1311
March21st to endNight
21%
594
12%
2115
6%
594
31%
594
15%
1458
April1st to 10thNight
28%
540
23%
1800
11%
540
44%
540
27%
1008
April11th to 20thNight
30%
533
22%
1775
16%
533
42%
533
23%
1102
April21st to endNight
24%
540
18%
1800
9%
540
39%
540
22%
1159
May1st to 10thNight
36%
540
17%
1800
11%
540
47%
540
27%
1094
May11th to 20thNight
39%
531
20%
1504
14%
531
45%
531
28%
981
May21st to endNight
47%
584
17%
1552
11%
582
51%
582
26%
1077
June1st to 10thNight
60%
540
19%
1440
15%
540
64%
540
38%
871
June11th to 20thNight
69%
540
30%
1440
23%
540
72%
540
52%
773
June21st to endNight
66%
540
26%
1440
18%
540
71%
540
51%
776
July1st to 10thNight
69%
525
18%
1400
16%
525
70%
525
38%
863
July11th to 20thNight
75%
522
22%
1496
21%
522
77%
522
47%
793
July21st to endNight
70%
591
23%
1673
23%
558
75%
558
36%
968
August1st to 10thNight
73%
537
22%
1601
24%
534
75%
534
36%
921
August11th to 20thNight
69%
534
24%
1761
27%
534
73%
534
35%
969
August21st to endNight
72%
594
24%
1980
28%
594
74%
594
37%
1067
September1st to 10thNight
67%
540
26%
1800
27%
540
71%
540
35%
975
September11th to 20thNight
67%
540
31%
1800
29%
540
73%
540
34%
1006
September21st to endNight
57%
681
29%
2014
20%
681
64%
681
37%
1132
October1st to 10thNight
55%
720
29%
2160
20%
720
62%
720
43%
1139
October11th to 20thNight
37%
720
31%
2160
16%
720
50%
720
33%
1236
October21st to endNight
33%
792
26%
2376
14%
792
45%
792
25%
1494
November1st to 10thNight
37%
740
30%
2316
17%
740
52%
740
35%
1263
November11th to 20thNight
32%
760
28%
2470
15%
760
48%
760
27%
1438
November21st to endNight
28%
836
23%
2546
13%
836
39%
836
24%
1621
December1st to 10thNight
26%
950
21%
2660
7%
950
38%
950
23%
1763
December11th to 20thNight
26%
949
21%
3151
9%
948
35%
948
19%
2088
December21st to endNight
20%
1043
12%
4839
6%
1026
31%
1026
11%
3533

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
13%7%35%5%35%5%5%7%43%
74775
Night
13%7%35%42445%7%47%
75181
TransparencyDay
39%7%12%23%16%3
74490
Night
37%6%12%24%18%3
74988
SeeingDay
17%12%26%25%16%4
14404
Night
18%11%28%27%14%2
24365

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%8%35%4345%45%44%
1593
11th to 20thDay
16%8%47%5%34446%39%
1710
21st to endDay
16%8%36%423346%45%
1791
February1st to 10thDay
17%9%46%6%35%445%38%
1620
11th to 20thDay
17%8%46%4245%46%40%
1702
21st to endDay
18%10%45%43445%6%37%
1480
March1st to 10thDay
16%8%36%43335%6%44%
1908
11th to 20thDay
20%9%36%433346%37%
1980
21st to endDay
21%9%46%5%35%5%45%31%
2240
April1st to 10thDay
12%6%36%42445%8%46%
2160
11th to 20thDay
18%8%45%5%34446%39%
2134
21st to endDay
18%7%36%6%3445%6%37%
2160
May1st to 10thDay
18%6%35%6%35%5%6%8%35%
2160
11th to 20thDay
16%6%26%5%3445%7%42%
2387
21st to endDay
11%6%36%7%5%6%5%6%10%34%
2725
June1st to 10thDay
9%5%26%6%46%5%5%9%43%
2520
11th to 20thDay
6%3245%445%7%9%50%
2520
21st to endDay
5%3235%36%6%8%9%50%
2520
July1st to 10thDay
10%5%26%6%35%6%6%9%42%
2520
11th to 20thDay
44245%37%6%7%10%48%
2411
21st to endDay
8%5%25%6%5%6%6%6%9%41%
2546
August1st to 10thDay
7%426%6%46%6%7%10%41%
2328
11th to 20thDay
10%5%25%7%36%5%7%8%40%
2138
21st to endDay
9%5%25%5%445%6%9%47%
2376
September1st to 10thDay
12%5%244345%6%7%47%
2160
11th to 20thDay
11%5%25%5%345%6%7%47%
2160
21st to endDay
10%42442345%7%54%
1923
October1st to 10thDay
9%5%24435%35%6%54%
1800
11th to 20thDay
15%6%24423335%53%
1800
21st to endDay
20%6%3442334447%
1980
November1st to 10thDay
13%5%24424445%54%
1759
11th to 20thDay
13%7%36%323346%50%
1710
21st to endDay
19%8%25%334345%45%
1633
December1st to 10thDay
17%7%35%5%25%35%6%42%
1520
11th to 20thDay
15%10%48%5%34345%40%
1918
21st to endDay
15%16%46%5%34445%32%
2783
January1st to 10thNight
16%9%45%424345%45%
2568
11th to 20thNight
16%8%36%434346%42%
2470
21st to endNight
14%8%36%5%2445%6%43%
2600
February1st to 10thNight
16%10%36%33335%6%41%
2340
11th to 20thNight
16%7%35%5%23447%44%
2143
21st to endNight
19%9%35%42444441%
1776
March1st to 10thNight
17%7%35%424446%44%
2066
11th to 20thNight
19%9%36%5%335%45%38%
1980
21st to endNight
20%10%45%5%2445%6%34%
2115
April1st to 10thNight
10%5%245%2445%9%51%
1800
11th to 20thNight
13%7%36%5%2445%7%44%
1775
21st to endNight
18%6%36%5%33448%41%
1800
May1st to 10thNight
16%5%2432446%8%47%
1800
11th to 20thNight
16%6%24424347%47%
1503
21st to endNight
10%7%37%6%45%5%6%9%38%
1551
June1st to 10thNight
8%425%5%345%6%8%50%
1440
11th to 20thNight
6%21322345%10%60%
1440
21st to endNight
321332347%11%59%
1440
July1st to 10thNight
8%424435%6%5%8%51%
1440
11th to 20thNight
5%22433346%10%59%
1545
21st to endNight
4335%5%35%6%7%8%51%
1772
August1st to 10thNight
5%325%435%6%7%10%49%
1611
11th to 20thNight
6%4245%445%6%7%54%
1761
21st to endNight
7%424425%45%9%54%
1980
September1st to 10thNight
10%32432445%8%54%
1800
11th to 20thNight
9%5%2343445%7%54%
1800
21st to endNight
8%425%4235%46%56%
2014
October1st to 10thNight
8%414323347%60%
2160
11th to 20thNight
14%6%2432235%5%55%
2160
21st to endNight
20%6%23323335%49%
2376
November1st to 10thNight
11%5%2432335%5%57%
2316
11th to 20thNight
14%6%24423446%50%
2470
21st to endNight
18%8%35%423335%46%
2546
December1st to 10thNight
16%9%25%42435%7%41%
2660
11th to 20thNight
17%9%36%5%34346%41%
3279
21st to endNight
19%15%47%5%3445%5%28%
4884

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
42%410%25%16%3
1594
11th to 20thDay
47%5%10%23%14%2
1710
21st to endDay
41%5%12%25%13%4
1791
February1st to 10thDay
49%411%22%12%1
1620
11th to 20thDay
45%5%12%21%14%4
1712
21st to endDay
49%5%7%21%12%6%
1480
March1st to 10thDay
42%49%22%18%5%
1908
11th to 20thDay
49%6%9%18%15%4
1980
21st to endDay
53%7%11%18%10%1
2240
April1st to 10thDay
36%6%13%24%19%2
2160
11th to 20thDay
46%5%10%19%16%3
2134
21st to endDay
47%7%10%20%14%1
2160
May1st to 10thDay
46%8%12%21%11%1
2160
11th to 20thDay
40%9%12%23%14%2
2391
21st to endDay
44%11%13%19%12%1
2725
June1st to 10thDay
37%8%13%24%16%1
2520
11th to 20thDay
29%9%14%28%17%3
2520
21st to endDay
26%9%19%26%15%5%
2520
July1st to 10thDay
36%9%16%24%11%4
2451
11th to 20thDay
29%10%14%26%18%4
2338
21st to endDay
35%10%15%28%10%1
2405
August1st to 10thDay
33%11%17%25%14%1
2314
11th to 20thDay
37%9%14%26%12%1
2138
21st to endDay
33%8%15%22%15%6%
2376
September1st to 10thDay
33%8%12%27%14%5%
2160
11th to 20thDay
34%7%9%24%25%1
2160
21st to endDay
29%6%9%27%26%3
1923
October1st to 10thDay
31%6%9%24%25%4
1800
11th to 20thDay
35%47%24%23%6%
1800
21st to endDay
41%48%25%17%5%
1980
November1st to 10thDay
33%410%24%22%6%
1759
11th to 20thDay
36%47%23%23%6%
1710
21st to endDay
43%5%8%24%18%2
1633
December1st to 10thDay
42%6%11%25%14%3
1520
11th to 20thDay
47%6%7%19%21%1
1915
21st to endDay
52%7%11%15%13%3
2783
January1st to 10thNight
43%49%22%19%3
2568
11th to 20thNight
43%411%23%16%2
2470
21st to endNight
42%5%11%24%17%2
2600
February1st to 10thNight
45%411%23%14%2
2340
11th to 20thNight
41%413%21%18%3
2144
21st to endNight
46%48%22%16%5%
1776
March1st to 10thNight
41%5%9%20%19%6%
2066
11th to 20thNight
48%6%9%20%14%3
1980
21st to endNight
50%6%12%20%11%1
2115
April1st to 10thNight
31%6%14%25%21%4
1800
11th to 20thNight
39%6%11%23%15%5%
1775
21st to endNight
43%6%10%24%16%1
1800
May1st to 10thNight
36%7%14%24%17%2
1800
11th to 20thNight
38%8%13%20%18%2
1504
21st to endNight
42%9%15%19%13%2
1552
June1st to 10thNight
29%8%17%25%19%2
1440
11th to 20thNight
19%6%15%36%19%4
1440
21st to endNight
18%8%19%30%18%8%
1440
July1st to 10thNight
29%9%17%24%17%4
1400
11th to 20thNight
21%7%19%29%20%4
1496
21st to endNight
26%11%16%33%14%
1673
August1st to 10thNight
26%11%17%32%13%1
1601
11th to 20thNight
27%8%16%29%18%2
1761
21st to endNight
27%7%17%25%20%5%
1980
September1st to 10thNight
28%6%13%29%19%5%
1800
11th to 20thNight
29%8%11%25%25%3
1800
21st to endNight
28%6%10%24%29%3
2014
October1st to 10thNight
24%5%12%28%26%6%
2160
11th to 20thNight
32%39%25%25%6%
2160
21st to endNight
39%5%7%22%21%6%
2376
November1st to 10thNight
29%411%28%22%6%
2316
11th to 20thNight
35%5%7%23%23%7%
2470
21st to endNight
42%47%23%22%2
2546
December1st to 10thNight
42%6%11%22%17%2
2660
11th to 20thNight
45%5%8%23%17%2
3281
21st to endNight
55%7%11%16%9%2
4884

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
28%23%32%14%2
270
11th to 20thDay
33%24%30%10%2
270
21st to endDay
21%35%33%9%2
267
February1st to 10thDay
28%26%35%8%3
240
11th to 20thDay
34%24%30%9%21
240
21st to endDay
34%23%31%10%21
198
March1st to 10thDay
28%23%37%11%1
240
11th to 20thDay
37%22%27%12%3
240
21st to endDay
33%22%32%11%2
326
April1st to 10thDay
21%19%35%19%6%
420
11th to 20thDay
25%20%30%17%7%1
412
21st to endDay
24%18%33%19%5%1
420
May1st to 10thDay
19%21%33%19%7%1
423
11th to 20thDay
19%12%31%22%12%4
615
21st to endDay
14%8%33%27%14%4
679
June1st to 10thDay
10%5%23%31%25%7%
630
11th to 20thDay
7%322%42%22%5%
630
21st to endDay
5%6%30%36%20%5%
630
July1st to 10thDay
11%313%30%33%9%
621
11th to 20thDay
5%321%34%29%7%
618
21st to endDay
10%214%35%29%10%
684
August1st to 10thDay
10%215%40%27%7%
626
11th to 20thDay
17%215%31%29%7%
452
21st to endDay
13%213%29%31%13%
495
September1st to 10thDay
12%416%32%29%8%
450
11th to 20thDay
9%418%30%28%12%
450
21st to endDay
13%9%23%28%20%7%
374
October1st to 10thDay
14%9%30%33%9%4
270
11th to 20thDay
22%17%36%19%6%
270
21st to endDay
28%22%28%20%3
297
November1st to 10thDay
17%13%36%26%6%2
270
11th to 20thDay
21%20%34%17%9%
270
21st to endDay
31%16%30%16%6%1
270
December1st to 10thDay
19%25%32%17%6%2
270
11th to 20thDay
26%20%31%16%6%
270
21st to endDay
29%24%33%11%3
297
January1st to 10thNight
23%21%33%19%4
950
11th to 20thNight
24%23%33%16%3
950
21st to endNight
20%20%37%21%2
1000
February1st to 10thNight
24%18%38%18%1
900
11th to 20thNight
22%20%39%17%2
748
21st to endNight
26%20%34%18%2
592
March1st to 10thNight
24%15%35%23%3
626
11th to 20thNight
25%14%33%23%5%
540
21st to endNight
25%16%33%21%5%
594
April1st to 10thNight
14%17%38%26%5%
540
11th to 20thNight
17%17%32%26%8%
533
21st to endNight
21%11%40%20%7%
540
May1st to 10thNight
15%8%36%31%9%
540
11th to 20thNight
18%7%32%26%15%2
531
21st to endNight
14%6%26%35%16%4
584
June1st to 10thNight
8%418%35%32%2
540
11th to 20thNight
7%119%45%25%2
540
21st to endNight
4223%38%31%2
540
July1st to 10thNight
10%112%33%35%9%
525
11th to 20thNight
5%212%40%35%7%
522
21st to endNight
5%114%39%35%6%
591
August1st to 10thNight
7%29%40%39%4
537
11th to 20thNight
8%113%37%37%3
534
21st to endNight
9%210%33%39%7%
594
September1st to 10thNight
10%212%38%33%5%
540
11th to 20thNight
12%214%31%35%6%
540
21st to endNight
10%6%22%30%29%3
681
October1st to 10thNight
10%5%26%32%25%3
720
11th to 20thNight
18%12%31%28%11%
720
21st to endNight
25%13%27%27%8%
792
November1st to 10thNight
14%11%35%30%10%1
740
11th to 20thNight
19%14%32%26%8%
760
21st to endNight
24%13%32%23%8%
836
December1st to 10thNight
23%15%32%23%5%
950
11th to 20thNight
27%14%30%24%5%
950
21st to endNight
28%17%32%21%2
1045
Page generated at 2024-01-19 08:28:37. Version ac07

Copyright 2024 Attilla Danko


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