Inks Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Inks Lake State Park clear sky chart from 2005-11-05 to 2017-12-20.

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
53%
15844
28%
48084
19%
15799
61%
15799
38%
26835

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
40%
897
27%
2327
12%
895
49%
895
37%
1416
January16th to endNight
39%
888
31%
2424
14%
888
51%
888
37%
1440
February1st to 15thNight
37%
704
29%
2106
13%
698
49%
698
35%
1187
February16th to endNight
28%
632
30%
1894
9%
632
46%
632
35%
1060
March1st to 15thNight
38%
570
28%
2010
17%
570
51%
570
28%
1139
March16th to endNight
36%
576
26%
2112
17%
576
50%
576
31%
1137
April1st to 15thNight
31%
539
25%
1977
13%
539
48%
539
30%
1072
April16th to endNight
32%
540
27%
1736
14%
540
50%
540
32%
1008
May1st to 15thNight
35%
539
23%
1620
15%
539
48%
539
33%
966
May16th to endNight
50%
562
25%
1684
20%
561
60%
561
35%
982
June1st to 15thNight
72%
540
22%
1620
23%
540
78%
540
52%
794
June16th to endNight
74%
540
24%
1620
28%
540
76%
540
40%
901
July1st to 15thNight
79%
510
23%
1530
26%
510
81%
510
47%
804
July16th to endNight
85%
564
28%
1594
32%
531
88%
531
51%
787
August1st to 15thNight
91%
539
32%
1667
37%
536
91%
536
57%
757
August16th to endNight
80%
573
22%
1958
28%
573
80%
573
33%
1110
September1st to 15thNight
78%
540
21%
1980
26%
540
79%
540
33%
1094
September16th to endNight
72%
537
27%
1980
28%
537
75%
537
30%
1087
October1st to 15thNight
72%
543
33%
1983
32%
543
76%
543
42%
955
October16th to endNight
60%
768
37%
2304
24%
768
68%
768
49%
1153
November1st to 15thNight
54%
809
28%
2329
17%
809
60%
809
39%
1329
November16th to endNight
50%
975
33%
2535
17%
975
59%
975
43%
1458
December1st to 15thNight
45%
975
28%
2535
16%
975
50%
975
35%
1596
December16th to endNight
41%
984
25%
2559
12%
984
49%
984
33%
1603

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
10%424424446%49%
48744
Night
9%413323347%55%
48286
Cloud CoverDay
10%5%2442445%7%49%
48742
Night
9%413323347%55%
48286
TransparencyDay
33%5%10%19%20%10%
48442
Night
28%5%11%20%20%12%
48091
SeeingDay
11%318%30%27%8%
5706
Night
11%425%38%18%1
15849

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
15%423213335%53%
1611
16th to endDay
14%41332334454%
1809
February1st to 15thDay
13%6%14212335%55%
1750
16th to endDay
15%5%1322234453%
1580
March1st to 15thDay
16%6%34313345%47%
1947
16th to endDay
15%5%24322425%51%
2112
April1st to 15thDay
11%6%24424347%47%
1971
16th to endDay
12%5%24434445%48%
2219
May1st to 15thDay
14%7%35%5%3445%7%39%
2331
16th to endDay
13%6%35%5%35%5%5%6%38%
2430
June1st to 15thDay
43136%345%5%9%52%
2340
16th to endDay
9%4245%35%5%6%9%42%
2340
July1st to 15thDay
7%3146%46%5%6%9%44%
2340
16th to endDay
6%214425%5%6%11%49%
2466
August1st to 15thDay
212335%45%9%61%
2280
16th to endDay
6%325%6%46%5%7%10%40%
2244
September1st to 15thDay
8%5%25%7%35%45%6%45%
1980
16th to endDay
8%4246%35%5%6%6%45%
1980
October1st to 15thDay
9%414423345%55%
1964
16th to endDay
7%31221233467%
1920
November1st to 15thDay
10%6%34424345%50%
1856
16th to endDay
11%41341322459%
1755
December1st to 15thDay
16%6%14323345%48%
1755
16th to endDay
15%7%24314345%47%
1764
January1st to 15thNight
14%423312336%54%
2327
16th to endNight
15%413313335%54%
2424
February1st to 15thNight
12%5%23212235%57%
2102
16th to endNight
12%42432323455%
1894
March1st to 15thNight
13%424323348%48%
2010
16th to endNight
11%42331335%5%54%
2112
April1st to 15thNight
9%5%14413346%52%
1977
16th to endNight
12%5%2432335%7%50%
1736
May1st to 15thNight
10%6%1331345%8%49%
1619
16th to endNight
8%32442346%10%49%
1683
June1st to 15thNight
231222345%8%64%
1620
16th to endNight
5%223326%5%5%8%55%
1620
July1st to 15thNight
42133134411%57%
1620
16th to endNight
311221346%13%59%
1702
August1st to 15thNight
211223439%68%
1677
16th to endNight
44144345%7%9%49%
1958
September1st to 15thNight
7%3144345%5%8%51%
1980
16th to endNight
7%5%145%3345%7%50%
1980
October1st to 15thNight
8%312313336%62%
1983
16th to endNight
7%212212345%65%
2304
November1st to 15thNight
10%423313336%58%
2329
16th to endNight
10%423212235%60%
2535
December1st to 15thNight
14%5%24413236%50%
2535
16th to endNight
13%6%24313235%51%
2559

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%423212335%53%
1611
16th to endDay
14%413313335%54%
1809
February1st to 15thDay
12%6%23221335%55%
1750
16th to endDay
14%5%1321335%453%
1580
March1st to 15thDay
16%6%24323346%47%
1947
16th to endDay
14%6%24223335%51%
2110
April1st to 15thDay
11%6%24424346%48%
1971
16th to endDay
12%6%24434435%49%
2219
May1st to 15thDay
14%7%35%425%45%7%39%
2331
16th to endDay
13%6%25%5%35%5%6%6%38%
2430
June1st to 15thDay
42135%3446%9%53%
2340
16th to endDay
9%4246%25%47%8%43%
2340
July1st to 15thDay
6%3145%37%6%6%9%44%
2340
16th to endDay
6%213425%47%11%49%
2466
August1st to 15thDay
21233445%9%61%
2280
16th to endDay
6%325%6%46%6%7%10%40%
2244
September1st to 15thDay
7%6%25%5%44447%45%
1980
16th to endDay
9%415%5%35%5%6%6%46%
1980
October1st to 15thDay
8%414423345%56%
1964
16th to endDay
7%31221222468%
1920
November1st to 15thDay
11%5%345%23336%50%
1856
16th to endDay
10%42332322459%
1755
December1st to 15thDay
16%6%23313246%48%
1755
16th to endDay
14%7%24323336%47%
1764
January1st to 15thNight
14%5%13312335%54%
2327
16th to endNight
14%31231334454%
2424
February1st to 15thNight
12%5%23312235%57%
2102
16th to endNight
12%414313245%56%
1894
March1st to 15thNight
13%5%24323338%49%
2010
16th to endNight
10%423313346%55%
2112
April1st to 15thNight
9%425%323346%53%
1977
16th to endNight
11%5%33413347%51%
1736
May1st to 15thNight
10%5%2332336%9%49%
1619
16th to endNight
7%4144235%6%9%49%
1683
June1st to 15thNight
2213212448%65%
1620
16th to endNight
4213325%5%5%8%56%
1620
July1st to 15thNight
42233234411%58%
1620
16th to endNight
311121346%13%60%
1702
August1st to 15thNight
211213339%68%
1677
16th to endNight
4314435%5%7%9%49%
1958
September1st to 15thNight
7%3134345%5%8%51%
1980
16th to endNight
7%415%5%235%5%7%50%
1980
October1st to 15thNight
7%213312347%61%
1983
16th to endNight
7%212312335%66%
2304
November1st to 15thNight
9%423423236%58%
2329
16th to endNight
9%413312335%60%
2535
December1st to 15thNight
14%6%24323246%50%
2535
16th to endNight
13%7%24323335%51%
2559

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
34%36%18%24%12%
1612
16th to endDay
32%36%13%25%17%
1809
February1st to 15thDay
31%27%15%22%19%
1751
16th to endDay
33%35%19%22%15%
1580
March1st to 15thDay
38%5%7%12%20%14%
1947
16th to endDay
36%48%17%22%10%
2112
April1st to 15thDay
36%49%16%18%14%
1971
16th to endDay
38%47%18%19%11%
2219
May1st to 15thDay
42%6%10%12%18%8%
2331
16th to endDay
43%6%10%17%17%3
2434
June1st to 15thDay
26%7%12%24%23%6%
2340
16th to endDay
35%7%14%20%16%4
2340
July1st to 15thDay
32%7%15%25%15%2
2201
16th to endDay
24%8%20%30%15%1
2311
August1st to 15thDay
18%6%17%35%19%2
2266
16th to endDay
36%9%15%23%11%3
2244
September1st to 15thDay
37%7%12%20%17%5%
1980
16th to endDay
34%7%11%17%19%8%
1980
October1st to 15thDay
30%410%21%18%14%
1964
16th to endDay
22%2416%31%22%
1920
November1st to 15thDay
35%5%9%20%18%10%
1856
16th to endDay
30%36%15%23%21%
1755
December1st to 15thDay
38%38%16%22%10%
1755
16th to endDay
38%48%15%22%10%
1764
January1st to 15thNight
33%36%16%21%18%
2327
16th to endNight
32%36%15%23%19%
2424
February1st to 15thNight
31%37%13%22%22%
2112
16th to endNight
31%27%16%23%18%
1894
March1st to 15thNight
34%5%8%13%23%15%
2010
16th to endNight
30%5%10%18%23%11%
2112
April1st to 15thNight
32%49%17%18%17%
1977
16th to endNight
33%5%11%17%19%12%
1736
May1st to 15thNight
32%6%12%21%18%9%
1620
16th to endNight
29%7%14%27%17%3
1685
June1st to 15thNight
17%5%16%28%25%6%
1620
16th to endNight
24%8%14%28%19%4
1620
July1st to 15thNight
19%7%21%32%16%1
1530
16th to endNight
15%9%24%34%15%1
1594
August1st to 15thNight
13%5%19%38%20%2
1667
16th to endNight
27%10%19%26%11%4
1958
September1st to 15thNight
28%8%15%23%17%6%
1980
16th to endNight
30%7%12%22%17%9%
1980
October1st to 15thNight
23%414%24%19%14%
1983
16th to endNight
21%26%16%27%24%
2304
November1st to 15thNight
28%5%8%22%21%13%
2329
16th to endNight
27%38%16%23%21%
2535
December1st to 15thNight
35%49%16%21%12%
2535
16th to endNight
36%38%14%23%13%
2559

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%6%25%38%8%1
90
16th to endDay
10%12%39%28%9%
96
February1st to 15thDay
10%10%31%34%13%1
90
16th to endDay
16%9%39%29%4
81
March1st to 15thDay
18%8%35%24%11%1
90
16th to endDay
7%6%40%35%10%
96
April1st to 15thDay
13%7%36%36%41
90
16th to endDay
14%9%38%24%12%
329
May1st to 15thDay
17%7%35%28%9%
468
16th to endDay
20%427%33%12%2
517
June1st to 15thDay
5%112%43%31%5%
495
16th to endDay
8%210%36%32%9%
495
July1st to 15thDay
5%8%36%40%9%
475
16th to endDay
4326%48%16%
515
August1st to 15thDay
2322%53%18%
433
16th to endDay
11%431%32%19%
284
September1st to 15thDay
3219%42%31%
135
16th to endDay
15%123%37%21%
135
October1st to 15thDay
39%21%43%21%
135
16th to endDay
13%318%27%33%3
144
November1st to 15thDay
24%222%36%8%4
135
16th to endDay
16%8%25%26%17%5%
135
December1st to 15thDay
20%427%25%14%6%
135
16th to endDay
30%11%29%23%4
108
January1st to 15thNight
17%8%30%34%9%
900
16th to endNight
16%7%34%35%7%
888
February1st to 15thNight
14%9%34%33%6%
704
16th to endNight
15%7%46%28%2
632
March1st to 15thNight
15%8%33%37%5%
570
16th to endNight
11%8%41%33%5%
576
April1st to 15thNight
10%6%48%31%2
539
16th to endNight
13%6%45%27%7%
540
May1st to 15thNight
12%6%42%31%6%
540
16th to endNight
9%233%38%15%1
563
June1st to 15thNight
318%51%25%
540
16th to endNight
315%54%22%2
540
July1st to 15thNight
48%49%34%2
510
16th to endNight
3445%40%4
564
August1st to 15thNight
2139%50%4
539
16th to endNight
7%1340%43%4
573
September1st to 15thNight
8%6%38%41%4
540
16th to endNight
8%10%38%39%2
537
October1st to 15thNight
7%213%43%28%3
543
16th to endNight
9%323%36%23%2
768
November1st to 15thNight
11%326%38%18%1
809
16th to endNight
12%7%25%37%16%1
975
December1st to 15thNight
17%7%26%38%9%
975
16th to endNight
17%7%28%37%8%
984
Page generated at 2017-12-21 06:04:43. Version ac04

Copyright 2017 A. Danko


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