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Green River State Wildlife Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Green River State Wildlife Area clear sky chart from 2005-11-05 to 2018-02-22.

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%
16687
19%
48910
11%
16644
45%
16644
26%
31894

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
24%
975
15%
2716
5%
970
32%
970
21%
1912
January16th to endNight
22%
1040
14%
2814
5%
1040
29%
1040
19%
2052
February1st to 15thNight
25%
916
15%
2448
4%
916
32%
916
21%
1738
February16th to endNight
27%
659
19%
1977
8%
659
36%
659
19%
1353
March1st to 15thNight
29%
708
15%
2148
9%
708
35%
708
21%
1457
March16th to endNight
31%
576
14%
2004
9%
576
38%
576
18%
1372
April1st to 15thNight
28%
539
16%
1797
11%
539
38%
539
21%
1180
April16th to endNight
35%
540
19%
1787
14%
540
43%
540
22%
1190
May1st to 15thNight
37%
540
17%
1539
10%
540
45%
540
25%
1037
May16th to endNight
47%
563
19%
1497
10%
561
54%
561
32%
965
June1st to 15thNight
57%
540
18%
1440
12%
540
61%
540
38%
875
June16th to endNight
52%
540
18%
1440
10%
540
56%
540
34%
914
July1st to 15thNight
66%
510
18%
1360
12%
510
68%
510
42%
796
July16th to endNight
70%
564
23%
1417
18%
531
72%
531
44%
817
August1st to 15thNight
74%
539
23%
1599
24%
536
75%
536
43%
864
August16th to endNight
67%
573
22%
1910
23%
573
71%
573
35%
1037
September1st to 15thNight
66%
540
30%
1800
31%
540
71%
540
39%
933
September16th to endNight
57%
684
29%
1947
20%
684
63%
684
37%
1122
October1st to 15thNight
45%
720
26%
2130
19%
720
52%
720
33%
1275
October16th to endNight
31%
768
20%
2394
12%
768
41%
768
23%
1527
November1st to 15thNight
33%
760
24%
2471
15%
760
45%
760
28%
1466
November16th to endNight
27%
878
20%
2633
10%
878
37%
878
23%
1732
December1st to 15thNight
22%
975
14%
2730
4%
975
30%
975
19%
1980
December16th to endNight
19%
1040
12%
2912
4%
1040
27%
1040
13%
2300

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%8%36%5%3445%7%37%
49348
Night
13%8%35%424446%40%
49079
Cloud CoverDay
14%8%35%5%3445%7%37%
49356
Night
14%7%35%424446%41%
49084
TransparencyDay
45%412%23%12%1
49034
Night
43%311%24%14%2
48911
SeeingDay
15%7%25%27%18%6%
6476
Night
17%7%29%31%12%1
16690

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
13%13%49%6%35%5%5%7%25%
1552
16th to endDay
13%14%6%10%6%25%45%5%26%
1760
February1st to 15thDay
14%14%48%5%25%445%29%
1744
16th to endDay
14%11%48%6%4435%6%30%
1643
March1st to 15thDay
16%11%35%6%2435%6%33%
1811
16th to endDay
17%9%5%6%5%45%45%8%29%
2220
April1st to 15thDay
17%10%47%5%2435%6%33%
2151
16th to endDay
20%9%25%5%335%46%33%
2172
May1st to 15thDay
18%8%47%5%35%45%7%29%
2410
16th to endDay
14%6%25%6%35%46%7%36%
2617
June1st to 15thDay
11%5%24435%5%6%8%42%
2520
16th to endDay
9%5%25%5%35%5%6%10%39%
2520
July1st to 15thDay
6%5%25%425%6%6%9%45%
2520
16th to endDay
6%425%5%35%6%6%10%43%
2655
August1st to 15thDay
5%5%15%5%35%6%8%9%43%
2349
16th to endDay
10%5%23435%5%5%8%44%
2292
September1st to 15thDay
13%313424447%49%
2160
16th to endDay
8%5%3443446%7%47%
2001
October1st to 15thDay
17%6%34323345%44%
1827
16th to endDay
18%8%25%423346%39%
1829
November1st to 15thDay
14%9%345%2445%6%39%
1717
16th to endDay
17%10%46%323335%39%
1654
December1st to 15thDay
16%13%47%6%3434429%
1560
16th to endDay
18%15%5%7%7%23446%23%
1664
January1st to 15thNight
14%10%47%5%3435%5%34%
2716
16th to endNight
11%11%6%9%6%34446%30%
2814
February1st to 15thNight
14%11%5%7%424436%36%
2446
16th to endNight
15%10%47%414435%37%
1977
March1st to 15thNight
16%9%35%434445%37%
2135
16th to endNight
17%8%36%6%35%45%7%31%
2004
April1st to 15thNight
17%9%44434346%38%
1797
16th to endNight
19%7%35%42346%6%36%
1787
May1st to 15thNight
16%7%25%4245%6%8%35%
1539
16th to endNight
10%5%25%5%245%7%9%42%
1496
June1st to 15thNight
10%32442445%6%50%
1440
16th to endNight
8%3246%36%6%5%9%43%
1440
July1st to 15thNight
6%414334447%54%
1440
16th to endNight
42244346%7%10%48%
1513
August1st to 15thNight
5%32343345%8%55%
1608
16th to endNight
8%42443335%8%51%
1910
September1st to 15thNight
10%313313346%58%
1800
16th to endNight
7%4245%246%5%7%50%
1947
October1st to 15thNight
11%6%24423345%50%
2130
16th to endNight
17%9%35%323336%41%
2394
November1st to 15thNight
13%7%23413347%47%
2471
16th to endNight
16%7%35%423346%40%
2633
December1st to 15thNight
18%12%5%7%423445%32%
2730
16th to endNight
21%13%5%8%6%35%335%23%
2912

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
13%12%5%8%7%36%5%5%6%26%
1552
16th to endDay
13%15%5%9%6%245%45%27%
1760
February1st to 15thDay
14%15%48%5%25%445%29%
1744
16th to endDay
14%10%5%7%5%45%346%31%
1643
March1st to 15thDay
16%11%45%6%34346%33%
1821
16th to endDay
17%9%5%6%5%3445%7%30%
2218
April1st to 15thDay
18%10%5%6%424445%33%
2151
16th to endDay
21%8%25%5%24446%33%
2172
May1st to 15thDay
19%7%37%5%345%47%30%
2410
16th to endDay
14%6%25%5%35%45%8%36%
2617
June1st to 15thDay
12%4245%35%5%5%8%42%
2520
16th to endDay
10%425%5%35%5%7%10%40%
2520
July1st to 15thDay
7%4245%25%6%6%9%45%
2520
16th to endDay
7%3245%35%5%6%10%43%
2655
August1st to 15thDay
6%4245%35%5%7%10%44%
2349
16th to endDay
11%5%144345%5%8%45%
2292
September1st to 15thDay
13%31332335%8%50%
2160
16th to endDay
9%425%42345%8%47%
2001
October1st to 15thDay
17%6%34323445%44%
1827
16th to endDay
18%8%245%23346%40%
1829
November1st to 15thDay
14%8%345%24447%39%
1717
16th to endDay
17%10%45%423225%39%
1654
December1st to 15thDay
17%13%48%5%34345%30%
1560
16th to endDay
18%14%7%6%6%33446%23%
1664
January1st to 15thNight
14%11%5%6%6%34345%35%
2716
16th to endNight
12%11%6%9%5%35%45%6%30%
2814
February1st to 15thNight
14%11%5%6%423435%36%
2439
16th to endNight
16%10%37%5%14336%37%
1977
March1st to 15thNight
17%9%35%424445%38%
2148
16th to endNight
17%9%45%6%35%45%7%31%
2004
April1st to 15thNight
18%8%44334336%38%
1797
16th to endNight
19%7%35%42345%6%37%
1787
May1st to 15thNight
16%6%25%425%46%7%36%
1538
16th to endNight
10%5%25%4145%7%9%43%
1496
June1st to 15thNight
10%424424447%49%
1440
16th to endNight
9%2245%36%5%7%8%44%
1440
July1st to 15thNight
7%31432445%7%54%
1440
16th to endNight
4214425%5%8%10%49%
1513
August1st to 15thNight
5%32343245%8%55%
1608
16th to endNight
9%324423447%51%
1910
September1st to 15thNight
10%312313245%59%
1800
16th to endNight
7%4243245%5%7%50%
1947
October1st to 15thNight
12%424423335%51%
2130
16th to endNight
18%9%24323335%42%
2394
November1st to 15thNight
13%8%24323346%47%
2471
16th to endNight
17%7%45%423346%40%
2633
December1st to 15thNight
18%12%47%424345%32%
2730
16th to endNight
21%13%5%8%6%3433424%
2912

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
56%411%16%10%
1553
16th to endDay
59%312%16%7%
1760
February1st to 15thDay
57%212%19%6%1
1746
16th to endDay
53%412%20%7%1
1643
March1st to 15thDay
51%414%21%7%
1821
16th to endDay
52%315%22%5%
2220
April1st to 15thDay
51%311%24%8%
2151
16th to endDay
50%411%19%12%1
2172
May1st to 15thDay
52%5%12%22%7%
2410
16th to endDay
45%5%12%21%14%
2621
June1st to 15thDay
37%313%28%15%
2520
16th to endDay
37%6%12%25%16%2
2520
July1st to 15thDay
33%5%14%28%15%2
2371
16th to endDay
32%5%18%26%14%2
2488
August1st to 15thDay
32%6%15%26%16%2
2334
16th to endDay
35%6%11%28%16%2
2292
September1st to 15thDay
33%49%27%21%3
2160
16th to endDay
33%411%29%18%1
2001
October1st to 15thDay
41%39%28%16%1
1827
16th to endDay
45%213%24%11%2
1829
November1st to 15thDay
43%311%24%13%2
1717
16th to endDay
48%216%25%6%
1654
December1st to 15thDay
57%312%18%8%
1560
16th to endDay
61%412%12%7%
1664
January1st to 15thNight
50%312%18%14%
2716
16th to endNight
53%314%17%9%
2814
February1st to 15thNight
50%311%22%11%
2448
16th to endNight
49%311%24%9%1
1977
March1st to 15thNight
48%413%21%10%2
2148
16th to endNight
51%313%20%9%1
2004
April1st to 15thNight
47%29%23%14%2
1797
16th to endNight
47%49%23%10%4
1787
May1st to 15thNight
44%413%23%12%
1539
16th to endNight
36%6%13%23%17%2
1498
June1st to 15thNight
33%312%27%19%2
1440
16th to endNight
35%6%12%22%19%4
1440
July1st to 15thNight
30%212%31%19%2
1360
16th to endNight
25%6%15%29%18%4
1417
August1st to 15thNight
25%414%33%18%3
1599
16th to endNight
30%412%28%19%4
1910
September1st to 15thNight
27%28%28%27%4
1800
16th to endNight
30%49%31%20%3
1947
October1st to 15thNight
35%38%27%21%3
2130
16th to endNight
44%29%26%14%1
2394
November1st to 15thNight
37%411%26%17%3
2471
16th to endNight
45%311%27%12%
2633
December1st to 15thNight
53%211%21%9%
2730
16th to endNight
64%29%15%6%
2912

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
22%11%34%23%6%
135
16th to endDay
15%14%40%18%9%
144
February1st to 15thDay
20%15%42%15%5%
135
16th to endDay
25%18%32%14%9%2
100
March1st to 15thDay
31%17%31%15%31
90
16th to endDay
24%11%26%26%8%1
204
April1st to 15thDay
21%11%30%25%9%1
270
16th to endDay
24%10%25%24%12%4
270
May1st to 15thDay
20%10%29%25%11%2
367
16th to endDay
15%8%28%24%17%5%
517
June1st to 15thDay
10%425%33%20%4
495
16th to endDay
12%5%31%28%16%6%
495
July1st to 15thDay
12%219%30%23%11%
475
16th to endDay
8%118%30%30%11%
515
August1st to 15thDay
6%215%33%30%11%
448
16th to endDay
9%312%32%28%12%
332
September1st to 15thDay
12%213%33%27%11%
315
16th to endDay
7%6%18%32%30%5%
314
October1st to 15thDay
19%8%25%28%16%3
162
16th to endDay
25%9%36%20%7%
144
November1st to 15thDay
16%8%29%24%13%8%
135
16th to endDay
31%11%31%19%6%
135
December1st to 15thDay
17%17%31%25%5%1
135
16th to endDay
27%17%40%12%2
144
January1st to 15thNight
19%11%38%23%6%
975
16th to endNight
17%10%37%28%4
1040
February1st to 15thNight
21%9%36%27%5%
919
16th to endNight
20%10%36%26%6%
659
March1st to 15thNight
23%8%32%28%7%
708
16th to endNight
21%7%34%27%8%1
576
April1st to 15thNight
23%10%32%27%5%
539
16th to endNight
23%8%28%29%9%
540
May1st to 15thNight
20%6%29%34%8%
540
16th to endNight
12%428%38%14%
563
June1st to 15thNight
10%321%49%13%
540
16th to endNight
9%329%42%15%
540
July1st to 15thNight
10%115%41%28%2
510
16th to endNight
5%114%45%30%3
564
August1st to 15thNight
5%18%46%32%5%
539
16th to endNight
10%112%39%32%3
573
September1st to 15thNight
10%313%39%28%4
540
16th to endNight
9%5%21%37%23%3
684
October1st to 15thNight
14%6%27%31%17%1
720
16th to endNight
21%10%32%25%9%
768
November1st to 15thNight
17%7%37%26%10%1
760
16th to endNight
21%11%34%25%6%
878
December1st to 15thNight
25%11%33%24%5%
975
16th to endNight
27%11%32%24%4
1040
Page generated at 2018-02-23 10:21:40. Version ac04

Copyright 2018 A. Danko


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