Cuivre River State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cuivre River State Park clear sky chart from 2005-11-05 to 2017-09-21.

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
44%
15873
22%
46917
14%
15827
51%
15827
29%
29052

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
30%
899
21%
2476
9%
895
39%
895
25%
1639
January16th to endNight
26%
960
21%
2496
7%
960
35%
960
26%
1679
February1st to 15thNight
27%
858
14%
2267
4%
855
34%
855
21%
1630
February16th to endNight
26%
631
22%
1893
8%
631
37%
631
26%
1192
March1st to 15thNight
28%
633
18%
2073
9%
633
37%
633
20%
1378
March16th to endNight
35%
576
14%
2049
12%
576
41%
576
17%
1376
April1st to 15thNight
35%
539
21%
1797
13%
539
47%
539
26%
1081
April16th to endNight
39%
540
23%
1800
17%
540
52%
540
28%
1092
May1st to 15thNight
45%
540
18%
1640
13%
539
51%
539
27%
1026
May16th to endNight
54%
563
21%
1497
14%
561
59%
561
33%
960
June1st to 15thNight
66%
540
21%
1440
14%
540
69%
540
45%
816
June16th to endNight
63%
540
22%
1440
15%
540
67%
540
43%
833
July1st to 15thNight
69%
510
20%
1360
16%
510
70%
510
41%
812
July16th to endNight
75%
564
25%
1508
23%
531
77%
531
45%
824
August1st to 15thNight
78%
539
24%
1649
27%
536
79%
536
41%
881
August16th to endNight
74%
573
25%
1910
30%
573
77%
573
38%
1009
September1st to 15thNight
65%
540
28%
1800
30%
540
68%
540
35%
988
September16th to endNight
63%
609
33%
1834
27%
609
68%
609
39%
1013
October1st to 15thNight
52%
660
30%
1980
21%
660
59%
660
37%
1120
October16th to endNight
39%
704
26%
2112
16%
704
49%
704
33%
1229
November1st to 15thNight
43%
700
28%
2273
19%
700
55%
700
34%
1235
November16th to endNight
32%
795
22%
2415
13%
795
43%
795
27%
1495
December1st to 15thNight
28%
900
16%
2520
7%
900
36%
900
21%
1779
December16th to endNight
26%
960
16%
2688
7%
960
33%
960
18%
1965

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%6%25%5%2445%7%42%
47947
Night
13%6%24424446%45%
47101
TransparencyDay
40%312%25%15%2
47634
Night
39%311%25%17%3
46919
SeeingDay
13%5%20%28%23%8%
5909
Night
16%6%25%33%16%1
15874

By Month

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%8%38%6%33436%37%
1459
16th to endDay
13%9%47%5%33346%37%
1728
February1st to 15thDay
15%7%5%7%434446%36%
1593
16th to endDay
12%11%36%425%345%38%
1580
March1st to 15thDay
15%11%36%434335%37%
1896
16th to endDay
19%8%45%6%35%445%31%
2173
April1st to 15thDay
16%8%25%424445%42%
2151
16th to endDay
19%7%25%5%23446%37%
2160
May1st to 15thDay
18%5%345%3445%7%36%
2309
16th to endDay
13%5%25%5%345%5%7%41%
2617
June1st to 15thDay
8%4245%35%5%6%8%45%
2520
16th to endDay
8%313435%5%7%9%47%
2520
July1st to 15thDay
8%414435%46%10%45%
2520
16th to endDay
5%224435%5%7%11%47%
2554
August1st to 15thDay
7%425%5%36%5%7%8%43%
2301
16th to endDay
9%4246%245%5%8%45%
2292
September1st to 15thDay
12%4245%2435%6%48%
2160
16th to endDay
9%42443345%8%49%
1904
October1st to 15thDay
14%5%24422335%51%
1650
16th to endDay
14%5%1442233354%
1760
November1st to 15thDay
14%423213246%51%
1582
16th to endDay
17%6%35%423347%40%
1542
December1st to 15thDay
17%8%46%5%23345%38%
1440
16th to endDay
18%10%45%423446%34%
1536
January1st to 15thNight
14%7%46%433445%42%
2476
16th to endNight
12%10%46%42435%6%39%
2496
February1st to 15thNight
14%10%5%6%435%445%35%
2258
16th to endNight
15%7%45%422335%45%
1893
March1st to 15thNight
18%8%25%42433440%
2073
16th to endNight
19%8%35%5%2445%8%32%
2049
April1st to 15thNight
13%6%35%424346%46%
1797
16th to endNight
16%6%24423348%43%
1800
May1st to 15thNight
16%5%235%3345%7%43%
1640
16th to endNight
11%424435%5%47%46%
1496
June1st to 15thNight
6%31432436%7%55%
1440
16th to endNight
7%314425%5%6%10%49%
1440
July1st to 15thNight
9%32442446%7%51%
1440
16th to endNight
4314425%46%12%51%
1612
August1st to 15thNight
6%314225%6%5%8%55%
1659
16th to endNight
5%31442445%8%53%
1910
September1st to 15thNight
12%313323346%54%
1800
16th to endNight
8%324323347%55%
1834
October1st to 15thNight
10%314413346%54%
1980
16th to endNight
15%5%23223345%51%
2112
November1st to 15thNight
11%5%24323346%55%
2273
16th to endNight
16%7%23323345%46%
2415
December1st to 15thNight
19%10%35%5%34346%33%
2520
16th to endNight
19%12%45%5%2434332%
2688

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
47%310%24%13%1
1460
16th to endDay
46%214%25%9%
1728
February1st to 15thDay
48%313%23%10%
1595
16th to endDay
47%212%23%11%1
1580
March1st to 15thDay
49%310%22%12%1
1896
16th to endDay
53%412%19%9%
2175
April1st to 15thDay
43%39%24%17%1
2151
16th to endDay
47%311%24%12%1
2160
May1st to 15thDay
46%412%25%10%
2309
16th to endDay
41%413%20%16%2
2621
June1st to 15thDay
33%414%27%17%2
2520
16th to endDay
28%5%17%27%17%3
2520
July1st to 15thDay
33%412%30%15%3
2371
16th to endDay
29%5%16%31%16%1
2395
August1st to 15thDay
35%5%12%27%17%1
2287
16th to endDay
35%412%22%19%5%
2292
September1st to 15thDay
35%47%27%20%4
2160
16th to endDay
32%48%31%19%2
1904
October1st to 15thDay
35%29%27%20%4
1650
16th to endDay
34%29%30%20%3
1760
November1st to 15thDay
33%212%23%22%5%
1582
16th to endDay
44%210%28%12%1
1542
December1st to 15thDay
48%214%24%9%
1440
16th to endDay
49%312%23%9%2
1536
January1st to 15thNight
44%28%28%14%
2476
16th to endNight
45%213%25%12%
2496
February1st to 15thNight
50%310%20%13%1
2267
16th to endNight
43%113%26%14%1
1893
March1st to 15thNight
48%39%24%12%2
2073
16th to endNight
50%412%23%9%
2049
April1st to 15thNight
39%38%25%19%3
1797
16th to endNight
40%29%28%17%2
1800
May1st to 15thNight
39%5%16%22%16%
1641
16th to endNight
37%5%14%21%18%3
1498
June1st to 15thNight
26%415%30%21%1
1440
16th to endNight
28%313%28%20%5%
1440
July1st to 15thNight
30%410%33%16%4
1360
16th to endNight
25%414%33%19%1
1508
August1st to 15thNight
26%413%30%21%2
1649
16th to endNight
27%412%25%24%5%
1910
September1st to 15thNight
32%28%24%24%7%
1800
16th to endNight
28%38%29%26%3
1834
October1st to 15thNight
31%38%26%23%5%
1980
16th to endNight
35%28%27%21%4
2112
November1st to 15thNight
31%210%25%21%8%
2273
16th to endNight
40%210%28%17%1
2415
December1st to 15thNight
51%211%21%11%
2520
16th to endNight
55%29%19%10%2
2688

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
28%11%41%14%31
90
16th to endDay
12%17%43%21%4
96
February1st to 15thDay
18%16%35%22%6%
90
16th to endDay
16%13%33%25%9%1
81
March1st to 15thDay
30%6%40%17%41
90
16th to endDay
23%10%33%24%6%1
159
April1st to 15thDay
17%11%26%28%16%
270
16th to endDay
21%7%24%28%13%2
270
May1st to 15thDay
14%10%27%28%15%3
365
16th to endDay
16%6%24%32%13%6%
517
June1st to 15thDay
9%316%31%26%11%
495
16th to endDay
9%322%35%22%7%
495
July1st to 15thDay
11%112%32%31%10%
475
16th to endDay
5%110%27%39%14%
515
August1st to 15thDay
9%17%29%39%13%
454
16th to endDay
8%29%24%41%13%
332
September1st to 15thDay
12%111%26%34%13%
315
16th to endDay
6%115%30%31%14%
248
October1st to 15thDay
7%8%17%28%27%8%
90
16th to endDay
14%6%26%39%13%
96
November1st to 15thDay
45%25%21%28%14%
90
16th to endDay
33%14%32%10%8%1
90
December1st to 15thDay
15%12%36%23%6%5%
90
16th to endDay
26%14%44%12%2
96
January1st to 15thNight
17%13%33%28%6%
900
16th to endNight
17%12%38%27%3
960
February1st to 15thNight
18%12%33%30%3
858
16th to endNight
19%10%38%28%3
631
March1st to 15thNight
23%9%32%28%5%
633
16th to endNight
23%6%28%32%9%
576
April1st to 15thNight
15%10%34%30%7%
539
16th to endNight
17%5%32%34%10%
540
May1st to 15thNight
17%5%23%38%13%1
540
16th to endNight
11%322%41%20%1
563
June1st to 15thNight
6%217%44%25%2
540
16th to endNight
8%116%46%25%2
540
July1st to 15thNight
10%17%44%32%3
510
16th to endNight
5%7%37%44%4
564
August1st to 15thNight
7%5%36%45%4
539
16th to endNight
6%7%39%40%4
573
September1st to 15thNight
13%110%34%32%7%
540
16th to endNight
11%214%30%33%6%
609
October1st to 15thNight
11%324%30%25%4
660
16th to endNight
19%6%31%31%10%
704
November1st to 15thNight
13%8%31%32%13%
700
16th to endNight
20%9%34%27%8%
795
December1st to 15thNight
25%8%31%25%7%
900
16th to endNight
26%9%31%29%3
960
Page generated at 2017-09-22 06:35:36. Version ac04

Copyright 2017 A. Danko


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