Red Feather Lakes
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Red Feather Lakes clear sky chart from 2005-11-05 to 2017-08-12.

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
29%
15877
26%
46499
9%
15830
46%
15830
26%
24852

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
15%
900
27%
2506
5%
895
35%
895
17%
1250
January16th to endNight
10%
816
30%
2544
3%
816
39%
816
15%
1217
February1st to 15thNight
9%
702
21%
2281
2%
698
31%
698
11%
1177
February16th to endNight
7%
632
27%
1894
2%
632
34%
632
14%
1008
March1st to 15thNight
17%
720
27%
2097
5%
720
36%
720
20%
1081
March16th to endNight
23%
690
24%
2034
7%
690
39%
690
21%
1122
April1st to 15thNight
20%
539
21%
1798
7%
539
38%
539
20%
981
April16th to endNight
24%
540
21%
1800
9%
540
41%
540
19%
1055
May1st to 15thNight
32%
540
19%
1551
7%
540
44%
540
25%
964
May16th to endNight
45%
563
18%
1498
9%
561
53%
561
31%
906
June1st to 15thNight
48%
540
21%
1440
11%
540
56%
540
43%
784
June16th to endNight
57%
540
29%
1440
17%
540
66%
540
55%
719
July1st to 15thNight
68%
510
19%
1360
14%
510
71%
510
43%
787
July16th to endNight
70%
564
24%
1436
19%
531
72%
531
45%
791
August1st to 15thNight
66%
527
22%
1594
18%
524
71%
524
42%
838
August16th to endNight
65%
525
28%
1750
24%
525
74%
525
39%
914
September1st to 15thNight
53%
495
29%
1650
21%
495
67%
495
36%
865
September16th to endNight
54%
508
35%
1773
26%
508
67%
508
40%
822
October1st to 15thNight
31%
660
27%
1980
10%
660
45%
660
26%
1093
October16th to endNight
21%
731
32%
2139
7%
731
42%
731
26%
1121
November1st to 15thNight
20%
875
30%
2275
6%
875
37%
875
27%
1212
November16th to endNight
13%
900
31%
2451
4%
900
36%
900
21%
1261
December1st to 15thNight
11%
900
21%
2520
2%
900
28%
900
13%
1375
December16th to endNight
13%
960
25%
2688
3%
960
33%
960
15%
1509

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
45%24435%5%6%8%48%
47488
Night
342332345%8%59%
46672
TransparencyDay
31%6%15%24%16%5%
47164
Night
23%5%16%29%19%5%
46499
SeeingDay
14%22%31%19%9%2
5754
Night
14%28%24%20%11%1
15879

By Month

Percentage Cloud Cover SW (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
215%42435%11%58%
1432
16th to endDay
323324449%59%
1689
February1st to 15thDay
5%35%6%2446%10%51%
1582
16th to endDay
5%35%5%2445%9%52%
1580
March1st to 15thDay
25%2442445%9%53%
1860
16th to endDay
38%35%425%5%6%8%45%
2188
April1st to 15thDay
5%8%26%5%26%5%6%8%44%
2150
16th to endDay
10%10%35%6%35%47%7%34%
2160
May1st to 15thDay
10%11%35%4445%5%7%37%
2395
16th to endDay
9%7%26%5%46%6%6%9%34%
2616
June1st to 15thDay
5%323446%7%6%9%45%
2520
16th to endDay
1213435%5%6%8%57%
2520
July1st to 15thDay
6%425%5%37%5%6%7%44%
2520
16th to endDay
5%425%6%46%6%6%9%41%
2632
August1st to 15thDay
7%5%25%6%47%6%7%7%39%
2271
16th to endDay
5%5%25%6%46%5%5%8%45%
2100
September1st to 15thDay
9%4234245%46%52%
1980
16th to endDay
5%424323345%60%
1856
October1st to 15thDay
5%4135%34446%54%
1650
16th to endDay
45%2332346%6%57%
1722
November1st to 15thDay
142331346%8%58%
1583
16th to endDay
32443435%7%61%
1506
December1st to 15thDay
16%3442335%9%55%
1440
16th to endDay
1436%42446%8%52%
1536
January1st to 15thNight
21232245%7%67%
2506
16th to endNight
222323348%65%
2544
February1st to 15thNight
424323347%61%
2270
16th to endNight
6%34323447%58%
1894
March1st to 15thNight
32431345%8%61%
2097
16th to endNight
36%2421345%8%56%
2034
April1st to 15thNight
36%245%2445%8%52%
1798
16th to endNight
10%8%2322246%7%47%
1800
May1st to 15thNight
9%8%13434447%48%
1550
16th to endNight
5%5%24335%5%6%8%49%
1497
June1st to 15thNight
42112145%6%10%58%
1440
16th to endNight
221221346%6%68%
1440
July1st to 15thNight
4323325%47%11%52%
1440
16th to endNight
23243245%6%8%55%
1533
August1st to 15thNight
421442345%9%55%
1603
16th to endNight
432332446%8%55%
1750
September1st to 15thNight
9%313413446%57%
1650
16th to endNight
4213322247%65%
1773
October1st to 15thNight
5%42432335%7%57%
1980
16th to endNight
25%23322338%62%
2139
November1st to 15thNight
131231335%7%64%
2275
16th to endNight
1313323446%65%
2451
December1st to 15thNight
142432345%8%59%
2520
16th to endNight
1335%32345%8%58%
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
21%5%27%28%13%2
1433
16th to endDay
21%422%30%16%4
1689
February1st to 15thDay
27%7%24%26%9%2
1582
16th to endDay
26%5%18%31%14%3
1580
March1st to 15thDay
27%419%28%16%2
1860
16th to endDay
32%6%16%27%13%2
2188
April1st to 15thDay
35%6%15%25%13%5%
2150
16th to endDay
44%6%13%23%10%1
2160
May1st to 15thDay
45%6%11%21%14%
2395
16th to endDay
43%8%13%21%10%2
2620
June1st to 15thDay
31%8%16%18%18%7%
2520
16th to endDay
22%6%9%23%26%10%
2520
July1st to 15thDay
36%8%12%16%15%11%
2371
16th to endDay
36%8%12%21%12%7%
2467
August1st to 15thDay
40%8%12%14%14%9%
2256
16th to endDay
36%7%10%19%21%5%
2100
September1st to 15thDay
31%6%9%19%22%11%
1980
16th to endDay
26%310%27%29%3
1856
October1st to 15thDay
28%6%11%26%21%5%
1650
16th to endDay
24%412%30%25%3
1722
November1st to 15thDay
22%6%16%25%22%6%
1583
16th to endDay
21%416%33%18%4
1506
December1st to 15thDay
26%7%23%29%11%1
1440
16th to endDay
27%7%19%28%14%3
1536
January1st to 15thNight
16%5%25%31%16%4
2506
16th to endNight
17%5%19%32%19%5%
2544
February1st to 15thNight
23%6%24%31%11%2
2281
16th to endNight
24%416%32%18%4
1894
March1st to 15thNight
20%5%17%32%21%2
2097
16th to endNight
25%6%15%34%15%2
2034
April1st to 15thNight
28%5%16%28%14%5%
1798
16th to endNight
33%7%12%30%15%1
1800
May1st to 15thNight
35%6%15%27%13%
1551
16th to endNight
31%7%18%26%15%1
1498
June1st to 15thNight
19%7%18%26%19%7%
1440
16th to endNight
14%5%7%29%26%15%
1440
July1st to 15thNight
25%6%16%22%18%10%
1360
16th to endNight
24%5%15%27%17%9%
1436
August1st to 15thNight
24%5%17%22%18%10%
1594
16th to endNight
24%6%11%26%24%6%
1750
September1st to 15thNight
27%412%20%21%13%
1650
16th to endNight
20%48%33%29%4
1773
October1st to 15thNight
26%5%12%26%22%6%
1980
16th to endNight
22%411%32%24%3
2139
November1st to 15thNight
19%416%26%25%7%
2275
16th to endNight
18%415%32%24%4
2451
December1st to 15thNight
21%7%25%29%13%2
2520
16th to endNight
23%8%19%31%15%2
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
24%22%30%6%11%5%
90
16th to endDay
17%36%31%12%2
96
February1st to 15thDay
32%40%22%41
90
16th to endDay
25%41%20%7%3
81
March1st to 15thDay
24%38%28%7%2
150
16th to endDay
20%40%29%7%1
288
April1st to 15thDay
24%36%28%8%1
269
16th to endDay
30%35%24%8%1
270
May1st to 15thDay
18%27%30%12%8%2
424
16th to endDay
16%17%31%21%10%2
517
June1st to 15thDay
8%18%30%26%12%3
495
16th to endDay
316%38%21%15%4
495
July1st to 15thDay
9%6%30%29%19%4
475
16th to endDay
6%6%30%30%18%7%
491
August1st to 15thDay
12%12%39%28%6%2
300
16th to endDay
9%12%36%32%6%2
268
September1st to 15thDay
12%22%41%18%4
255
16th to endDay
11%18%35%20%8%5%
148
October1st to 15thDay
10%28%26%24%6%3
90
16th to endDay
17%30%28%14%6%3
96
November1st to 15thDay
8%22%32%13%18%4
90
16th to endDay
26%50%15%7%
90
December1st to 15thDay
32%38%24%31
90
16th to endDay
22%45%14%15%1
96
January1st to 15thNight
23%41%17%11%5%1
900
16th to endNight
19%47%20%8%3
816
February1st to 15thNight
21%41%21%12%2
704
16th to endNight
19%42%26%9%1
632
March1st to 15thNight
13%41%25%12%6%
720
16th to endNight
13%35%25%21%3
690
April1st to 15thNight
11%30%34%18%4
539
16th to endNight
17%27%26%20%7%
540
May1st to 15thNight
15%18%29%22%12%1
540
16th to endNight
11%10%27%28%19%2
563
June1st to 15thNight
6%10%32%33%15%1
540
16th to endNight
25%30%35%23%1
540
July1st to 15thNight
5%218%36%31%4
510
16th to endNight
4115%40%34%4
564
August1st to 15thNight
5%219%42%27%2
527
16th to endNight
6%5%16%37%27%6%
525
September1st to 15thNight
11%7%22%34%18%4
495
16th to endNight
6%12%23%33%20%4
508
October1st to 15thNight
12%26%26%21%11%1
660
16th to endNight
13%34%27%15%7%2
731
November1st to 15thNight
16%34%26%15%5%1
875
16th to endNight
16%41%26%12%3
900
December1st to 15thNight
23%42%19%10%3
900
16th to endNight
21%40%21%12%4
960
Page generated at 2017-08-13 12:16:22. Version ac04

Copyright 2017 A. Danko


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