Cimarron
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cimarron clear sky chart from 2005-11-05 to 2017-10-06.

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
43%
15910
28%
46889
15%
15866
55%
15866
40%
25547

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
39%
900
30%
2449
14%
895
51%
895
43%
1352
January16th to endNight
39%
960
35%
2496
15%
960
52%
960
47%
1353
February1st to 15thNight
35%
702
23%
2112
11%
700
45%
700
33%
1219
February16th to endNight
30%
632
33%
1894
12%
632
47%
632
37%
1035
March1st to 15thNight
37%
675
28%
2115
12%
675
52%
675
35%
1142
March16th to endNight
32%
576
24%
2109
14%
576
47%
576
28%
1128
April1st to 15thNight
25%
539
25%
1798
10%
539
45%
539
29%
995
April16th to endNight
28%
540
23%
1694
12%
540
45%
540
29%
998
May1st to 15thNight
36%
540
25%
1620
16%
540
50%
540
36%
897
May16th to endNight
40%
562
20%
1684
11%
561
52%
561
35%
964
June1st to 15thNight
36%
540
20%
1575
8%
540
47%
540
40%
862
June16th to endNight
50%
540
26%
1440
13%
540
59%
540
51%
775
July1st to 15thNight
63%
510
23%
1363
15%
510
68%
510
49%
752
July16th to endNight
65%
564
24%
1594
21%
531
69%
531
42%
865
August1st to 15thNight
64%
539
20%
1615
21%
536
68%
536
39%
916
August16th to endNight
59%
573
26%
1910
25%
573
67%
573
40%
989
September1st to 15thNight
54%
540
24%
1902
17%
540
68%
540
37%
1003
September16th to endNight
53%
537
33%
1980
27%
537
66%
537
40%
939
October1st to 15thNight
42%
513
34%
1881
25%
513
56%
513
35%
945
October16th to endNight
49%
793
34%
2201
16%
793
61%
793
52%
1112
November1st to 15thNight
48%
875
35%
2275
14%
875
59%
875
54%
1156
November16th to endNight
44%
900
35%
2340
15%
900
56%
900
49%
1258
December1st to 15thNight
37%
900
28%
2340
11%
900
48%
900
40%
1386
December16th to endNight
38%
960
32%
2502
14%
960
50%
960
38%
1506

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
7%413323447%57%
48293
Night
6%42332345%7%57%
47075
Cloud CoverDay
7%413323447%57%
48291
Night
6%42332345%7%57%
47075
TransparencyDay
27%411%26%22%6%
47981
Night
25%411%25%23%8%
46890
SeeingDay
9%7%29%34%16%3
5887
Night
8%8%35%35%10%
15913

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%414212345%62%
1481
16th to endDay
45%23323347%59%
1737
February1st to 15thDay
6%8%25%423236%55%
1750
16th to endDay
5%413323346%60%
1580
March1st to 15thDay
6%423423346%56%
1845
16th to endDay
11%423323336%55%
2112
April1st to 15thDay
10%423323346%54%
2150
16th to endDay
12%5%24324336%51%
2265
May1st to 15thDay
9%31342445%7%54%
2331
16th to endDay
7%3244245%5%8%51%
2430
June1st to 15thDay
43133235%5%8%58%
2380
16th to endDay
211332346%8%63%
2520
July1st to 15thDay
4324325%5%7%10%51%
2514
16th to endDay
5%2133236%5%10%54%
2466
August1st to 15thDay
7%313435%47%10%49%
2334
16th to endDay
6%313424447%57%
2292
September1st to 15thDay
8%425%423447%53%
2057
16th to endDay
5%313323336%63%
1980
October1st to 15thDay
13%315%212225%57%
1876
16th to endDay
7%31231223466%
1658
November1st to 15thDay
4212223345%65%
1583
16th to endDay
6%42231132467%
1620
December1st to 15thDay
7%7%23323346%54%
1620
16th to endDay
7%6%24313346%55%
1712
January1st to 15thNight
4423423345%62%
2449
16th to endNight
3423322235%65%
2496
February1st to 15thNight
6%6%25%323336%54%
2102
16th to endNight
7%414313335%59%
1894
March1st to 15thNight
6%5%1442335%6%55%
2115
16th to endNight
9%5%24324346%54%
2109
April1st to 15thNight
9%314315%45%8%51%
1798
16th to endNight
11%5%2342345%7%49%
1694
May1st to 15thNight
8%42331345%7%55%
1619
16th to endNight
7%3133245%7%9%50%
1683
June1st to 15thNight
42223245%6%9%55%
1575
16th to endNight
321331346%10%59%
1440
July1st to 15thNight
32133246%7%12%52%
1443
16th to endNight
3223335%5%6%10%52%
1702
August1st to 15thNight
5%4144245%8%12%45%
1625
16th to endNight
5%32331345%8%57%
1910
September1st to 15thNight
7%31332346%7%55%
1902
16th to endNight
5%313413447%61%
1980
October1st to 15thNight
11%413212345%60%
1881
16th to endNight
5%212212235%68%
2201
November1st to 15thNight
3212213247%67%
2275
16th to endNight
5%313212446%64%
2340
December1st to 15thNight
7%5%23313447%55%
2340
16th to endNight
8%6%24312446%53%
2502

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%423212345%63%
1481
16th to endDay
5%423323347%59%
1737
February1st to 15thDay
6%7%35%423336%54%
1750
16th to endDay
5%413323346%59%
1580
March1st to 15thDay
7%423423347%56%
1845
16th to endDay
11%423312336%55%
2110
April1st to 15thDay
10%5%1332335%5%54%
2150
16th to endDay
12%5%24423346%51%
2265
May1st to 15thDay
9%31333345%7%54%
2331
16th to endDay
7%3243245%5%9%51%
2430
June1st to 15thDay
5%2133245%5%8%58%
2380
16th to endDay
211222445%8%63%
2520
July1st to 15thDay
4313325%5%7%10%51%
2514
16th to endDay
6%2133245%6%10%54%
2466
August1st to 15thDay
7%3143345%6%9%49%
2334
16th to endDay
6%223324447%57%
2292
September1st to 15thDay
8%425%323447%52%
2057
16th to endDay
5%213323336%62%
1980
October1st to 15thDay
13%423323225%57%
1876
16th to endDay
6%41221223466%
1658
November1st to 15thDay
4213223436%65%
1583
16th to endDay
6%42231223467%
1620
December1st to 15thDay
7%7%33322446%54%
1620
16th to endDay
7%5%24323336%55%
1712
January1st to 15thNight
4424423335%61%
2449
16th to endNight
3423322235%65%
2496
February1st to 15thNight
6%6%35%323446%54%
2102
16th to endNight
6%415%323345%58%
1894
March1st to 15thNight
6%5%2442335%6%55%
2115
16th to endNight
9%5%23314446%54%
2109
April1st to 15thNight
9%32432446%7%51%
1798
16th to endNight
11%5%25%32345%8%48%
1694
May1st to 15thNight
8%41331345%7%55%
1619
16th to endNight
7%3133245%7%9%51%
1683
June1st to 15thNight
43122246%6%9%55%
1575
16th to endNight
321231346%10%58%
1440
July1st to 15thNight
31134245%8%11%52%
1443
16th to endNight
4213425%5%6%9%53%
1702
August1st to 15thNight
5%42433448%12%46%
1625
16th to endNight
6%21432346%8%57%
1910
September1st to 15thNight
7%31332446%8%55%
1902
16th to endNight
4313312446%62%
1980
October1st to 15thNight
11%413212345%59%
1881
16th to endNight
5%3221223468%
2201
November1st to 15thNight
4212113347%67%
2275
16th to endNight
5%312213346%64%
2340
December1st to 15thNight
7%5%24322446%55%
2340
16th to endNight
8%6%24313346%53%
2502

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%414%30%23%5%
1482
16th to endDay
25%310%32%21%5%
1737
February1st to 15thDay
32%412%30%13%6%
1751
16th to endDay
24%311%27%22%9%
1580
March1st to 15thDay
28%39%26%23%8%
1845
16th to endDay
31%413%23%21%5%
2112
April1st to 15thDay
31%49%26%20%7%
2150
16th to endDay
34%49%27%19%4
2265
May1st to 15thDay
28%5%12%24%23%4
2331
16th to endDay
29%6%14%25%18%5%
2434
June1st to 15thDay
22%6%15%27%19%7%
2380
16th to endDay
17%5%11%28%26%9%
2520
July1st to 15thDay
25%6%12%24%26%4
2365
16th to endDay
23%6%14%27%23%4
2311
August1st to 15thDay
28%7%17%26%14%5%
2320
16th to endDay
25%5%10%29%22%6%
2292
September1st to 15thDay
31%410%24%18%10%
2057
16th to endDay
23%310%28%25%7%
1980
October1st to 15thDay
31%39%21%25%8%
1876
16th to endDay
22%28%25%32%9%
1658
November1st to 15thDay
20%37%25%30%11%
1583
16th to endDay
22%26%23%33%11%
1620
December1st to 15thDay
31%312%30%18%3
1620
16th to endDay
30%411%25%24%3
1712
January1st to 15thNight
25%39%30%25%5%
2449
16th to endNight
23%28%28%28%7%
2496
February1st to 15thNight
32%414%23%18%6%
2112
16th to endNight
27%38%25%24%10%
1894
March1st to 15thNight
28%38%23%24%11%
2115
16th to endNight
30%5%11%22%21%7%
2109
April1st to 15thNight
29%6%11%23%21%7%
1798
16th to endNight
33%5%12%24%18%4
1694
May1st to 15thNight
27%5%13%23%22%6%
1620
16th to endNight
26%8%19%22%16%6%
1685
June1st to 15thNight
23%7%17%27%17%6%
1575
16th to endNight
18%6%13%26%25%9%
1440
July1st to 15thNight
21%5%13%26%24%6%
1363
16th to endNight
24%6%15%24%23%6%
1594
August1st to 15thNight
27%6%18%27%13%5%
1615
16th to endNight
24%6%12%26%21%8%
1910
September1st to 15thNight
26%6%12%26%18%9%
1902
16th to endNight
22%5%8%24%29%9%
1980
October1st to 15thNight
27%49%20%28%9%
1881
16th to endNight
19%27%24%30%15%
2201
November1st to 15thNight
17%29%21%30%17%
2275
16th to endNight
21%37%24%28%14%
2340
December1st to 15thNight
28%411%29%20%5%
2340
16th to endNight
30%412%24%21%6%
2502

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%5%33%31%13%2
90
16th to endDay
6%11%46%27%7%1
96
February1st to 15thDay
12%5%42%32%6%1
90
16th to endDay
117%48%18%13%1
81
March1st to 15thDay
6%10%40%36%5%1
90
16th to endDay
15%12%35%27%7%2
96
April1st to 15thDay
14%20%38%19%6%1
269
16th to endDay
18%16%36%20%6%1
375
May1st to 15thDay
10%12%37%26%11%2
468
16th to endDay
13%9%34%28%13%
517
June1st to 15thDay
6%6%32%37%12%4
495
16th to endDay
2426%41%21%3
495
July1st to 15thDay
7%219%42%23%5%
475
16th to endDay
5%212%44%29%6%
515
August1st to 15thDay
8%116%44%24%4
487
16th to endDay
7%125%42%18%5%
332
September1st to 15thDay
5%5%23%39%22%3
212
16th to endDay
11%6%21%32%21%5%
135
October1st to 15thDay
14%7%28%39%9%1
107
16th to endDay
6%240%35%12%3
96
November1st to 15thDay
8%237%36%12%2
90
16th to endDay
16%11%36%22%12%1
90
December1st to 15thDay
10%11%44%23%10%1
90
16th to endDay
15%9%40%28%6%
96
January1st to 15thNight
6%10%38%34%9%
900
16th to endNight
6%9%41%33%8%
960
February1st to 15thNight
9%9%39%34%6%
704
16th to endNight
8%12%45%25%7%
632
March1st to 15thNight
9%12%36%34%7%
675
16th to endNight
13%14%38%29%4
576
April1st to 15thNight
12%15%43%24%3
539
16th to endNight
13%15%41%23%6%
540
May1st to 15thNight
9%11%38%30%9%
540
16th to endNight
9%10%37%33%9%
563
June1st to 15thNight
6%7%45%29%10%
540
16th to endNight
36%36%43%9%
540
July1st to 15thNight
3125%48%19%1
510
16th to endNight
5%122%47%21%1
564
August1st to 15thNight
7%120%52%17%1
539
16th to endNight
5%128%44%18%1
573
September1st to 15thNight
8%130%41%16%1
540
16th to endNight
6%6%29%40%16%
537
October1st to 15thNight
12%8%32%34%10%
513
16th to endNight
6%8%33%35%14%1
793
November1st to 15thNight
5%10%33%38%11%
875
16th to endNight
7%11%34%35%10%1
900
December1st to 15thNight
10%10%38%34%5%
900
16th to endNight
11%9%36%33%8%
960
Page generated at 2017-10-07 13:07:44. Version ac04

Copyright 2017 A. Danko


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