Cimarron National Grasslands
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cimarron National Grasslands clear sky chart from 2005-11-05 to 2017-12-01.

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
49%
16135
29%
47707
17%
16091
59%
16091
43%
25455

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
48%
900
30%
2506
17%
895
59%
895
48%
1298
January16th to endNight
49%
884
35%
2492
20%
884
60%
884
47%
1315
February1st to 15thNight
41%
703
26%
2112
14%
700
52%
700
39%
1158
February16th to endNight
32%
632
34%
1894
12%
632
51%
632
38%
1029
March1st to 15thNight
42%
720
28%
2160
14%
720
53%
720
41%
1160
March16th to endNight
35%
576
29%
2038
16%
576
53%
576
36%
1018
April1st to 15thNight
30%
539
27%
1798
12%
539
50%
539
36%
935
April16th to endNight
31%
540
24%
1758
13%
540
48%
540
32%
992
May1st to 15thNight
42%
540
26%
1620
16%
540
57%
540
39%
894
May16th to endNight
42%
561
21%
1684
12%
561
55%
561
37%
954
June1st to 15thNight
41%
540
20%
1493
9%
540
51%
540
44%
827
June16th to endNight
52%
540
25%
1440
14%
540
60%
540
50%
778
July1st to 15thNight
66%
510
23%
1360
16%
510
71%
510
48%
759
July16th to endNight
69%
564
23%
1522
21%
531
71%
531
41%
857
August1st to 15thNight
66%
539
17%
1712
19%
536
68%
536
31%
1020
August16th to endNight
65%
573
25%
1910
28%
573
69%
573
38%
1015
September1st to 15thNight
59%
540
25%
1862
21%
540
68%
540
39%
951
September16th to endNight
54%
537
34%
1980
27%
537
66%
537
42%
925
October1st to 15thNight
48%
540
35%
1980
26%
540
62%
540
38%
972
October16th to endNight
56%
867
38%
2403
21%
867
65%
867
58%
1163
November1st to 15thNight
55%
950
35%
2470
15%
950
65%
950
59%
1247
November16th to endNight
52%
975
39%
2535
19%
975
63%
975
53%
1327
December1st to 15thNight
47%
905
31%
2353
15%
905
57%
905
45%
1333
December16th to endNight
43%
960
32%
2625
17%
960
54%
960
38%
1528

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
6%313323347%59%
48719
Night
5%31332345%7%59%
47890
Cloud CoverDay
6%413323347%60%
48717
Night
5%31332345%7%59%
47890
TransparencyDay
24%411%24%24%10%
48404
Night
23%5%11%23%24%11%
47708
SeeingDay
8%5%26%34%21%4
6005
Night
7%5%34%39%12%
16138

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
5%42331324465%
1432
16th to endDay
3413213336%63%
1740
February1st to 15thDay
6%5%25%5%2332456%
1750
16th to endDay
46%13223346%61%
1580
March1st to 15thDay
5%423213347%61%
1800
16th to endDay
8%41231225%8%58%
2184
April1st to 15thDay
9%312222337%59%
2150
16th to endDay
11%413212337%55%
2202
May1st to 15thDay
7%313324346%58%
2331
16th to endDay
6%31331345%8%58%
2430
June1st to 15thDay
421232335%9%59%
2464
16th to endDay
31132345%8%65%
2520
July1st to 15thDay
5%313325%5%6%9%54%
2520
16th to endDay
5%21232446%9%57%
2539
August1st to 15thDay
6%314325%6%6%9%49%
2235
16th to endDay
5%31332335%8%58%
2292
September1st to 15thDay
9%424323347%52%
2097
16th to endDay
5%313322346%64%
1980
October1st to 15thDay
10%312221225%64%
1980
16th to endDay
422112236%70%
1806
November1st to 15thDay
4312313335%66%
1718
16th to endDay
5%41221223468%
1755
December1st to 15thDay
5%6%23313236%60%
1621
16th to endDay
7%6%24322336%57%
1593
January1st to 15thNight
3314313345%64%
2506
16th to endNight
432431234465%
2492
February1st to 15thNight
5%6%23323345%58%
2102
16th to endNight
5%414314346%58%
1894
March1st to 15thNight
5%5%23324346%58%
2160
16th to endNight
8%312313347%60%
2038
April1st to 15thNight
7%5%22324348%56%
1798
16th to endNight
11%4233135%5%7%51%
1758
May1st to 15thNight
7%313324348%58%
1619
16th to endNight
5%2223245%6%7%58%
1683
June1st to 15thNight
3112325%5%7%9%56%
1493
16th to endNight
31123235%6%10%57%
1440
July1st to 15thNight
32133235%8%11%53%
1440
16th to endNight
421343447%12%50%
1627
August1st to 15thNight
6%2145%46%6%7%11%43%
1722
16th to endNight
6%31342445%9%54%
1910
September1st to 15thNight
7%2133135%6%8%56%
1862
16th to endNight
5%21332345%6%62%
1980
October1st to 15thNight
9%3321233463%
1980
16th to endNight
4212112435%70%
2403
November1st to 15thNight
2212212346%69%
2470
16th to endNight
4312213325%68%
2535
December1st to 15thNight
5%42432235%7%59%
2353
16th to endNight
8%6%24322345%56%
2625

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
442332324365%
1432
16th to endDay
3413213436%64%
1740
February1st to 15thDay
6%5%35%42333456%
1750
16th to endDay
46%12323346%61%
1580
March1st to 15thDay
45%13213447%61%
1800
16th to endDay
8%41231235%8%58%
2182
April1st to 15thDay
9%312322447%58%
2150
16th to endDay
12%5%13312337%55%
2202
May1st to 15thDay
7%41332435%6%58%
2331
16th to endDay
6%31332345%8%58%
2430
June1st to 15thDay
421232445%9%59%
2464
16th to endDay
22122335%9%65%
2520
July1st to 15thDay
5%213425%5%6%9%54%
2520
16th to endDay
5%2123245%6%9%57%
2539
August1st to 15thDay
6%313425%5%7%9%49%
2235
16th to endDay
5%21332335%8%58%
2292
September1st to 15thDay
9%5%2332336%6%53%
2097
16th to endDay
5%212423246%64%
1980
October1st to 15thDay
10%312212225%64%
1980
16th to endDay
4212112236%71%
1806
November1st to 15thDay
4413213236%66%
1718
16th to endDay
5%41211223469%
1755
December1st to 15thDay
5%7%23313236%60%
1621
16th to endDay
7%6%24313336%58%
1593
January1st to 15thNight
3324312345%64%
2506
16th to endNight
4323312345%64%
2492
February1st to 15thNight
5%6%23323336%58%
2102
16th to endNight
5%424423445%58%
1894
March1st to 15thNight
5%5%23324346%57%
2160
16th to endNight
7%312213347%60%
2038
April1st to 15thNight
7%5%22324347%56%
1798
16th to endNight
11%5%2331445%7%51%
1758
May1st to 15thNight
7%312314347%58%
1619
16th to endNight
6%21332346%7%57%
1683
June1st to 15thNight
312325%6%6%10%56%
1493
16th to endNight
31123246%6%10%57%
1440
July1st to 15thNight
32124245%8%11%53%
1440
16th to endNight
4214425%47%11%50%
1627
August1st to 15thNight
7%314446%6%8%11%41%
1722
16th to endNight
5%31342446%8%55%
1910
September1st to 15thNight
7%2342346%7%57%
1862
16th to endNight
5%21322245%6%62%
1980
October1st to 15thNight
9%313212335%63%
1980
16th to endNight
5%22112345%69%
2403
November1st to 15thNight
2212212246%69%
2470
16th to endNight
4312212335%68%
2535
December1st to 15thNight
5%324313347%59%
2353
16th to endNight
8%6%24323345%56%
2625

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
22%411%26%28%6%
1433
16th to endDay
21%38%31%26%7%
1740
February1st to 15thDay
32%211%25%19%8%
1751
16th to endDay
24%38%26%24%12%
1580
March1st to 15thDay
22%311%24%24%13%
1800
16th to endDay
25%5%11%24%23%8%
2184
April1st to 15thDay
25%49%25%22%12%
2150
16th to endDay
29%411%25%21%8%
2202
May1st to 15thDay
26%5%11%23%23%9%
2331
16th to endDay
24%6%15%22%21%10%
2434
June1st to 15thDay
21%5%15%22%21%12%
2464
16th to endDay
16%411%26%26%15%
2520
July1st to 15thDay
25%6%11%24%25%7%
2371
16th to endDay
22%7%14%26%22%6%
2381
August1st to 15thDay
27%9%16%24%14%7%
2221
16th to endDay
23%6%11%28%22%7%
2292
September1st to 15thDay
30%5%11%23%19%10%
2097
16th to endDay
21%39%26%26%11%
1980
October1st to 15thDay
25%38%19%28%13%
1980
16th to endDay
16%39%21%35%13%
1806
November1st to 15thDay
20%37%24%30%14%
1718
16th to endDay
20%26%20%32%17%
1755
December1st to 15thDay
26%312%25%26%5%
1621
16th to endDay
29%211%25%25%5%
1593
January1st to 15thNight
21%39%29%27%7%
2506
16th to endNight
23%37%25%30%9%
2492
February1st to 15thNight
27%412%24%23%8%
2112
16th to endNight
27%37%22%24%13%
1894
March1st to 15thNight
26%48%22%26%11%
2160
16th to endNight
24%5%10%23%21%14%
2038
April1st to 15thNight
27%412%23%20%12%
1798
16th to endNight
30%6%13%21%19%9%
1758
May1st to 15thNight
25%6%12%22%22%10%
1620
16th to endNight
24%10%15%18%18%12%
1685
June1st to 15thNight
20%8%19%21%18%11%
1493
16th to endNight
19%6%14%25%22%12%
1440
July1st to 15thNight
21%7%13%27%23%6%
1360
16th to endNight
25%7%17%25%17%6%
1522
August1st to 15thNight
31%8%18%20%13%6%
1712
16th to endNight
25%7%11%25%22%6%
1910
September1st to 15thNight
23%7%15%27%17%8%
1862
16th to endNight
21%5%10%20%27%13%
1980
October1st to 15thNight
24%49%19%26%15%
1980
16th to endNight
16%36%22%31%19%
2403
November1st to 15thNight
15%39%22%28%19%
2470
16th to endNight
19%25%22%30%19%
2535
December1st to 15thNight
24%410%30%23%7%
2353
16th to endNight
30%39%24%24%8%
2625

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
14%6%21%33%20%4
90
16th to endDay
7%6%36%29%18%2
96
February1st to 15thDay
10%5%42%26%14%1
90
16th to endDay
47%40%28%13%4
81
March1st to 15thDay
4437%37%15%
90
16th to endDay
14%10%29%30%11%3
168
April1st to 15thDay
12%14%42%20%7%2
269
16th to endDay
15%13%39%25%6%
312
May1st to 15thDay
9%8%36%29%14%1
468
16th to endDay
9%6%32%33%17%
517
June1st to 15thDay
4431%35%18%5%
495
16th to endDay
3224%37%25%5%
495
July1st to 15thDay
6%113%41%28%9%
475
16th to endDay
6%9%38%36%9%
515
August1st to 15thDay
5%115%38%33%5%
390
16th to endDay
420%41%25%6%
332
September1st to 15thDay
5%217%41%25%7%
252
16th to endDay
14%216%33%25%7%
135
October1st to 15thDay
12%424%25%22%9%
135
16th to endDay
6%6%27%35%13%9%
144
November1st to 15thDay
10%228%31%20%6%
135
16th to endDay
9%16%23%27%19%3
135
December1st to 15thDay
6%13%31%36%12%
90
16th to endDay
14%8%27%41%8%
96
January1st to 15thNight
5%7%34%40%11%1
900
16th to endNight
6%6%33%42%10%
884
February1st to 15thNight
8%6%37%40%6%
704
16th to endNight
8%9%46%29%6%
632
March1st to 15thNight
8%7%38%37%8%
720
16th to endNight
8%9%45%29%6%
576
April1st to 15thNight
11%11%45%27%4
539
16th to endNight
13%9%44%27%5%
540
May1st to 15thNight
8%7%38%36%8%
540
16th to endNight
7%6%40%34%9%
563
June1st to 15thNight
36%44%36%8%
540
16th to endNight
3336%43%12%
540
July1st to 15thNight
3122%52%19%
510
16th to endNight
5%18%50%24%
564
August1st to 15thNight
7%117%51%22%
539
16th to endNight
6%22%46%22%1
573
September1st to 15thNight
8%127%46%15%
540
16th to endNight
5%333%41%16%
537
October1st to 15thNight
11%6%31%39%9%1
540
16th to endNight
6%430%37%18%1
867
November1st to 15thNight
45%32%45%11%1
950
16th to endNight
6%7%31%38%15%
975
December1st to 15thNight
6%7%34%41%9%
905
16th to endNight
12%7%32%37%9%
960
Page generated at 2017-12-02 08:14:24. Version ac04

Copyright 2017 A. Danko


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