Badlands National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Badlands National Park clear sky chart from 2005-11-05 to 2018-01-12.

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
45%
16627
22%
48338
13%
16584
52%
16584
34%
28623

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
37%
956
19%
2662
10%
951
44%
951
30%
1673
January16th to endNight
34%
960
20%
2688
9%
960
43%
960
30%
1679
February1st to 15thNight
34%
759
16%
2259
8%
759
41%
759
25%
1466
February16th to endNight
36%
632
21%
1894
11%
632
44%
632
31%
1148
March1st to 15thNight
43%
720
21%
2160
12%
720
51%
720
32%
1295
March16th to endNight
38%
588
19%
2027
13%
588
48%
588
25%
1231
April1st to 15thNight
37%
539
17%
1798
12%
539
47%
539
26%
1095
April16th to endNight
41%
540
17%
1671
15%
540
47%
540
25%
1092
May1st to 15thNight
45%
540
19%
1593
13%
540
52%
540
31%
981
May16th to endNight
41%
563
16%
1498
8%
561
44%
561
30%
986
June1st to 15thNight
46%
540
13%
1440
6%
540
49%
540
34%
903
June16th to endNight
54%
540
19%
1440
9%
540
58%
540
49%
792
July1st to 15thNight
60%
510
17%
1360
8%
510
63%
510
50%
736
July16th to endNight
66%
564
25%
1416
16%
531
70%
531
58%
729
August1st to 15thNight
61%
539
23%
1528
18%
536
66%
536
45%
838
August16th to endNight
67%
573
31%
1869
30%
573
75%
573
50%
886
September1st to 15thNight
57%
540
27%
1830
24%
540
67%
540
42%
907
September16th to endNight
57%
537
32%
1980
30%
537
67%
537
42%
923
October1st to 15thNight
43%
598
28%
2038
21%
598
52%
598
30%
1170
October16th to endNight
49%
949
27%
2485
12%
949
56%
949
39%
1461
November1st to 15thNight
45%
950
27%
2470
13%
950
52%
950
38%
1505
November16th to endNight
44%
975
29%
2590
14%
975
54%
975
38%
1539
December1st to 15thNight
36%
975
17%
2730
8%
975
43%
975
29%
1733
December16th to endNight
39%
1040
21%
2912
9%
1040
49%
1040
29%
1855

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
8%5%2442445%7%50%
49012
Night
8%5%2442445%7%49%
48505
Cloud CoverDay
8%5%2442445%7%50%
49022
Night
8%5%2442445%7%49%
48510
Cloud CoverDay
8%5%2442445%7%50%
49020
Night
8%5%2442445%7%49%
48510
TransparencyDay
32%315%28%16%4
48696
Night
33%314%26%16%4
48338
SeeingDay
11%5%26%32%18%4
6416
Night
11%6%30%38%12%
16632

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
5%6%48%6%34447%43%
1520
16th to endDay
5%8%36%6%24447%46%
1536
February1st to 15thDay
9%11%36%6%25%45%6%39%
1612
16th to endDay
5%6%45%5%3336%7%46%
1580
March1st to 15thDay
5%5%35%42345%8%50%
1790
16th to endDay
11%6%35%42446%8%41%
2195
April1st to 15thDay
12%7%25%42435%7%45%
2150
16th to endDay
15%7%445%2445%8%37%
2288
May1st to 15thDay
13%6%2442345%6%46%
2356
16th to endDay
15%6%244235%5%8%40%
2616
June1st to 15thDay
10%413325%45%9%48%
2520
16th to endDay
321331446%9%61%
2520
July1st to 15thDay
6%21232445%8%58%
2520
16th to endDay
421331345%8%61%
2656
August1st to 15thDay
44145%35%46%8%51%
2424
16th to endDay
6%312223346%62%
2331
September1st to 15thDay
8%312323336%60%
2130
16th to endDay
9%212112236%64%
1980
October1st to 15thDay
13%5%14322347%50%
1918
16th to endDay
9%5%23423346%53%
1728
November1st to 15thDay
6%5%244245%46%52%
1718
16th to endDay
6%7%35%42345%6%49%
1700
December1st to 15thDay
6%7%46%5%3445%6%44%
1560
16th to endDay
8%8%36%42435%7%43%
1664
January1st to 15thNight
46%38%5%35%5%6%6%44%
2662
16th to endNight
5%9%35%5%3445%7%45%
2688
February1st to 15thNight
9%8%46%6%25%45%5%41%
2256
16th to endNight
8%7%345%245%47%45%
1894
March1st to 15thNight
8%6%345%2445%6%47%
2147
16th to endNight
12%6%35%5%2445%8%40%
2027
April1st to 15thNight
13%5%25%425%45%8%43%
1798
16th to endNight
17%6%25%5%24447%38%
1671
May1st to 15thNight
11%5%145%345%6%7%45%
1593
16th to endNight
14%5%25%424447%43%
1497
June1st to 15thNight
12%3244235%6%8%45%
1440
16th to endNight
42133245%6%9%56%
1440
July1st to 15thNight
5%21331445%8%59%
1440
16th to endNight
211332346%9%61%
1512
August1st to 15thNight
33135%245%5%9%54%
1536
16th to endNight
411332345%6%64%
1869
September1st to 15thNight
8%213323347%58%
1830
16th to endNight
8%312212246%62%
1980
October1st to 15thNight
15%5%23323346%49%
2038
16th to endNight
9%41342445%6%52%
2485
November1st to 15thNight
7%6%2442345%6%50%
2470
16th to endNight
6%5%245%2345%7%52%
2590
December1st to 15thNight
7%8%36%5%2445%6%43%
2730
16th to endNight
6%8%36%425%5%5%6%44%
2912

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
5%6%48%6%4435%6%44%
1520
16th to endDay
5%7%36%424447%47%
1536
February1st to 15thDay
9%10%5%5%6%25%35%5%39%
1612
16th to endDay
5%6%35%6%3435%8%47%
1580
March1st to 15thDay
6%5%35%42445%7%51%
1800
16th to endDay
11%6%345%2446%9%41%
2195
April1st to 15thDay
12%7%25%323446%46%
2150
16th to endDay
15%7%345%2445%8%38%
2288
May1st to 15thDay
14%5%2432436%7%46%
2356
16th to endDay
16%5%2442445%8%40%
2616
June1st to 15thDay
10%413325%45%8%48%
2520
16th to endDay
32231346%8%62%
2520
July1st to 15thDay
6%2332445%8%58%
2520
16th to endDay
421331345%8%61%
2656
August1st to 15thDay
4224435%5%5%9%51%
2424
16th to endDay
6%313223346%62%
2331
September1st to 15thDay
8%313223336%60%
2130
16th to endDay
9%212112236%64%
1980
October1st to 15thDay
13%6%1432335%6%50%
1918
16th to endDay
9%5%23424346%53%
1728
November1st to 15thDay
6%42433445%5%52%
1718
16th to endDay
6%7%25%42345%7%50%
1700
December1st to 15thDay
6%7%47%5%3345%7%44%
1560
16th to endDay
9%9%36%5%2345%7%43%
1664
January1st to 15thNight
47%37%5%35%5%6%6%44%
2662
16th to endNight
5%9%35%5%3445%6%45%
2688
February1st to 15thNight
9%8%45%6%2445%5%41%
2249
16th to endNight
8%7%345%335%5%6%46%
1894
March1st to 15thNight
8%6%25%4335%5%6%47%
2160
16th to endNight
13%5%25%5%2446%8%41%
2027
April1st to 15thNight
13%4345%245%47%44%
1798
16th to endNight
17%6%24434447%38%
1671
May1st to 15thNight
11%5%235%25%5%5%7%45%
1592
16th to endNight
14%5%24424447%43%
1497
June1st to 15thNight
13%41442446%8%46%
1440
16th to endNight
5%1123235%6%8%57%
1440
July1st to 15thNight
5%21332435%8%59%
1440
16th to endNight
21114235%6%9%61%
1512
August1st to 15thNight
32135%245%6%8%55%
1536
16th to endNight
411332345%6%64%
1869
September1st to 15thNight
8%213223347%59%
1830
16th to endNight
9%21232246%63%
1980
October1st to 15thNight
15%5%24314345%49%
2038
16th to endNight
9%41332445%6%52%
2485
November1st to 15thNight
8%6%2442345%6%50%
2470
16th to endNight
6%5%2442345%7%52%
2590
December1st to 15thNight
8%8%36%425%45%6%43%
2730
16th to endNight
7%8%35%435%5%5%6%44%
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
5%6%49%6%44447%43%
1520
16th to endDay
5%8%35%5%335%48%46%
1536
February1st to 15thDay
9%11%45%6%3445%6%39%
1612
16th to endDay
5%7%35%5%3445%8%46%
1580
March1st to 15thDay
6%5%35%42446%8%49%
1800
16th to endDay
11%7%35%4345%6%8%40%
2193
April1st to 15thDay
12%6%35%32345%7%45%
2150
16th to endDay
15%7%35%42445%7%38%
2288
May1st to 15thDay
12%6%2432445%6%46%
2356
16th to endDay
15%5%2442446%8%40%
2616
June1st to 15thDay
10%423325%36%8%48%
2520
16th to endDay
321332345%8%61%
2520
July1st to 15thDay
6%21332445%8%58%
2520
16th to endDay
421232345%8%61%
2656
August1st to 15thDay
43145%345%6%9%51%
2424
16th to endDay
6%313313446%62%
2331
September1st to 15thDay
8%323323346%60%
2130
16th to endDay
9%312212336%64%
1980
October1st to 15thDay
14%424323347%50%
1918
16th to endDay
9%5%23334346%53%
1728
November1st to 15thDay
6%4244245%5%7%51%
1718
16th to endDay
6%7%35%42346%7%49%
1700
December1st to 15thDay
6%7%47%5%245%5%6%44%
1560
16th to endDay
8%8%37%42335%7%43%
1664
January1st to 15thNight
46%37%6%35%5%6%6%44%
2662
16th to endNight
49%35%5%2445%7%45%
2688
February1st to 15thNight
9%8%46%6%3445%6%40%
2249
16th to endNight
8%7%25%5%245%47%45%
1894
March1st to 15thNight
8%6%35%5%2445%6%47%
2160
16th to endNight
12%6%35%5%2445%9%40%
2027
April1st to 15thNight
13%5%3443445%8%43%
1798
16th to endNight
17%6%245%34447%38%
1671
May1st to 15thNight
11%5%1442447%7%45%
1592
16th to endNight
14%425%425%448%43%
1497
June1st to 15thNight
12%41442346%8%46%
1440
16th to endNight
421333446%8%57%
1440
July1st to 15thNight
5%21332345%8%59%
1440
16th to endNight
211242446%9%61%
1512
August1st to 15thNight
33234245%6%9%54%
1536
16th to endNight
421331335%6%64%
1869
September1st to 15thNight
8%212323347%59%
1830
16th to endNight
8%213212236%63%
1980
October1st to 15thNight
14%5%23423345%49%
2038
16th to endNight
9%4134245%5%6%52%
2485
November1st to 15thNight
7%5%25%42445%7%49%
2470
16th to endNight
6%5%245%2345%7%52%
2590
December1st to 15thNight
7%8%36%5%35%45%6%43%
2730
16th to endNight
6%8%36%435%5%5%6%44%
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
40%317%29%9%1
1521
16th to endDay
35%422%24%10%1
1536
February1st to 15thDay
45%317%22%9%2
1613
16th to endDay
35%318%27%10%3
1580
March1st to 15thDay
31%418%30%13%2
1800
16th to endDay
39%5%16%26%10%
2195
April1st to 15thDay
38%414%32%8%1
2150
16th to endDay
44%316%25%10%
2288
May1st to 15thDay
36%315%30%12%1
2356
16th to endDay
40%420%24%9%1
2620
June1st to 15thDay
32%418%27%14%1
2520
16th to endDay
19%315%33%22%6%
2520
July1st to 15thDay
24%412%25%25%8%
2371
16th to endDay
20%39%29%25%12%
2489
August1st to 15thDay
27%415%27%17%6%
2408
16th to endDay
23%29%30%23%10%
2331
September1st to 15thDay
25%29%29%23%9%
2130
16th to endDay
22%28%35%27%4
1980
October1st to 15thDay
35%312%23%21%4
1918
16th to endDay
31%214%30%15%5%
1728
November1st to 15thDay
31%313%25%20%4
1718
16th to endDay
32%315%29%16%1
1700
December1st to 15thDay
38%318%24%13%1
1560
16th to endDay
40%318%23%13%
1664
January1st to 15thNight
37%418%25%12%1
2662
16th to endNight
37%417%25%13%1
2688
February1st to 15thNight
43%315%25%9%1
2259
16th to endNight
37%315%27%11%3
1894
March1st to 15thNight
35%315%27%15%2
2160
16th to endNight
40%316%25%12%1
2027
April1st to 15thNight
39%5%13%26%13%2
1798
16th to endNight
44%314%23%12%1
1671
May1st to 15thNight
35%5%13%30%13%1
1593
16th to endNight
39%6%18%23%12%1
1498
June1st to 15thNight
35%419%24%14%1
1440
16th to endNight
22%416%31%18%5%
1440
July1st to 15thNight
23%313%26%24%8%
1360
16th to endNight
18%314%29%21%13%
1416
August1st to 15thNight
25%413%28%21%6%
1528
16th to endNight
20%39%28%27%10%
1869
September1st to 15thNight
24%310%26%26%8%
1830
16th to endNight
23%38%33%27%5%
1980
October1st to 15thNight
35%39%24%20%5%
2038
16th to endNight
30%313%26%20%5%
2485
November1st to 15thNight
33%211%24%21%5%
2470
16th to endNight
31%414%29%17%3
2590
December1st to 15thNight
39%415%27%11%2
2730
16th to endNight
38%418%23%13%1
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
6%130%34%18%8%
123
16th to endDay
12%5%20%36%20%4
96
February1st to 15thDay
14%11%37%28%7%
90
16th to endDay
6%19%40%14%14%3
81
March1st to 15thDay
7%5%42%26%14%3
90
16th to endDay
17%8%25%27%16%4
192
April1st to 15thDay
14%11%37%27%8%
269
16th to endDay
21%7%28%25%16%1
398
May1st to 15thDay
15%8%25%29%15%4
468
16th to endDay
18%5%25%32%14%4
517
June1st to 15thDay
10%427%32%18%6%
495
16th to endDay
5%6%29%36%21%2
495
July1st to 15thDay
8%320%40%24%3
475
16th to endDay
3221%42%26%3
515
August1st to 15thDay
5%223%42%22%3
493
16th to endDay
9%319%30%24%11%
371
September1st to 15thDay
7%6%20%31%25%9%
285
16th to endDay
14%227%30%19%5%
135
October1st to 15thDay
16%332%27%13%6%
135
16th to endDay
15%7%28%18%24%5%
144
November1st to 15thDay
9%324%37%19%5%
135
16th to endDay
19%7%28%34%8%
135
December1st to 15thDay
12%10%37%27%9%2
135
16th to endDay
11%9%41%27%9%1
144
January1st to 15thNight
7%9%35%35%11%1
956
16th to endNight
11%8%36%34%7%
960
February1st to 15thNight
13%7%33%35%8%
764
16th to endNight
12%439%31%10%
632
March1st to 15thNight
11%5%30%39%11%1
720
16th to endNight
15%8%29%35%10%
588
April1st to 15thNight
15%5%33%38%6%
539
16th to endNight
20%7%26%35%10%
540
May1st to 15thNight
13%6%28%37%12%1
540
16th to endNight
16%6%30%34%11%
563
June1st to 15thNight
14%5%30%36%13%1
540
16th to endNight
5%234%44%13%
540
July1st to 15thNight
6%125%44%20%1
510
16th to endNight
324%54%15%
564
August1st to 15thNight
4324%51%16%
539
16th to endNight
4321%49%21%
573
September1st to 15thNight
9%125%41%20%1
540
16th to endNight
10%426%40%18%1
537
October1st to 15thNight
18%427%35%12%1
598
16th to endNight
11%8%25%39%14%
949
November1st to 15thNight
11%5%30%39%12%
950
16th to endNight
9%6%35%37%11%
975
December1st to 15thNight
11%8%34%34%10%
975
16th to endNight
11%7%32%36%11%
1040
Page generated at 2018-01-12 20:01:27. Version ac04

Copyright 2018 A. Danko


Badlands National Park Clear Sky Chart |Charts Home