Bluerock Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bluerock Campground clear sky chart from 2005-11-05 to 2018-10-27.

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
31%
16574
14%
51210
6%
16541
39%
16541
19%
33571

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
17%
975
11%
2910
3%
970
25%
970
15%
2026
January16th to endNight
19%
848
18%
2928
8%
848
34%
848
16%
1860
February1st to 15thNight
27%
761
13%
2632
7%
757
37%
757
16%
1701
February16th to endNight
29%
684
15%
2114
8%
684
38%
684
18%
1435
March1st to 15thNight
22%
780
16%
2308
5%
780
34%
780
18%
1522
March16th to endNight
27%
832
11%
2243
2%
832
33%
832
16%
1635
April1st to 15thNight
31%
700
10%
1870
3%
700
35%
700
16%
1359
April16th to endNight
34%
579
10%
1737
7%
579
38%
579
17%
1230
May1st to 15thNight
43%
444
10%
1560
12%
444
45%
444
17%
1028
May16th to endNight
43%
406
6%
1421
5%
406
44%
406
15%
1022
June1st to 15thNight
36%
390
2%
1365
0%
390
36%
390
15%
958
June16th to endNight
44%
390
2%
1365
0%
390
44%
390
19%
877
July1st to 15thNight
50%
370
5%
1295
1%
370
52%
370
26%
756
July16th to endNight
58%
408
11%
1434
12%
386
63%
386
30%
774
August1st to 15thNight
61%
416
17%
1560
20%
414
67%
414
29%
866
August16th to endNight
54%
621
21%
1863
18%
621
56%
621
36%
1021
September1st to 15thNight
50%
747
17%
1977
10%
747
53%
747
34%
1219
September16th to endNight
40%
776
17%
2145
9%
776
47%
776
26%
1376
October1st to 15thNight
35%
780
15%
2297
7%
780
43%
780
18%
1594
October16th to endNight
30%
816
20%
2652
8%
816
45%
816
20%
1636
November1st to 15thNight
16%
861
15%
2571
3%
861
28%
861
16%
1677
November16th to endNight
16%
975
14%
2918
3%
975
27%
975
16%
1926
December1st to 15thNight
23%
975
15%
2925
7%
975
30%
975
18%
1952
December16th to endNight
20%
1040
16%
3120
4%
1040
31%
1040
16%
2121

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%9%47%6%35%5%6%8%32%
52379
Night
47%37%5%35%5%6%9%39%
51364
Cloud CoverDay
9%9%37%6%35%5%6%8%34%
52380
Night
5%7%36%5%35%5%6%8%41%
51367
TransparencyDay
45%10%16%18%8%1
52037
Night
38%10%17%21%9%1
51210
SeeingDay
17%19%30%20%9%2
7405
Night
10%19%32%24%11%2
16579

By Month

Percentage Cloud Cover NW (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
45%8%6%36%7%7%12%38%
1358
16th to endDay
5%5%8%6%46%5%7%12%35%
1658
February1st to 15thDay
15%5%9%7%46%7%8%10%33%
1561
16th to endDay
16%6%12%9%46%7%7%10%28%
1646
March1st to 15thDay
6%49%8%45%6%9%11%33%
1981
16th to endDay
315%6%11%9%46%6%7%8%20%
2331
April1st to 15thDay
6%17%6%9%5%46%6%8%9%20%
2407
16th to endDay
9%19%6%7%43346%8%25%
2498
May1st to 15thDay
8%15%47%6%35%46%7%29%
2720
16th to endDay
22%12%36%7%35%5%46%21%
3042
June1st to 15thDay
20%10%48%7%36%45%6%21%
2925
16th to endDay
15%8%47%7%46%5%5%7%26%
2925
July1st to 15thDay
10%6%26%6%46%5%7%8%33%
2925
16th to endDay
6%5%25%7%46%5%6%7%42%
2994
August1st to 15thDay
10%6%36%6%45%6%6%7%34%
2644
16th to endDay
10%5%25%5%345%5%8%43%
2691
September1st to 15thDay
12%8%24434446%43%
2311
16th to endDay
10%7%25%425%46%8%41%
2145
October1st to 15thDay
7%14%5%6%7%345%5%7%32%
1992
16th to endDay
39%37%5%246%8%9%39%
1828
November1st to 15thDay
38%36%5%346%7%11%37%
1605
16th to endDay
18%47%6%245%6%11%41%
1371
December1st to 15thDay
6%47%7%36%6%7%12%37%
1365
16th to endDay
5%49%7%5%5%5%7%11%37%
1456
January1st to 15thNight
16%39%7%35%6%8%12%34%
2910
16th to endNight
6%48%7%45%5%6%10%40%
2928
February1st to 15thNight
7%37%6%46%7%7%12%35%
2621
16th to endNight
7%49%7%46%6%6%8%37%
2114
March1st to 15thNight
15%47%6%45%5%8%10%40%
2308
16th to endNight
19%5%10%7%35%5%8%10%31%
2240
April1st to 15thNight
6%14%6%7%425%46%8%32%
1870
16th to endNight
5%12%5%9%5%3345%7%35%
1737
May1st to 15thNight
6%11%46%5%35%6%6%7%36%
1559
16th to endNight
18%10%36%5%35%45%6%29%
1421
June1st to 15thNight
15%9%46%6%34447%33%
1365
16th to endNight
11%7%25%5%35%6%6%6%40%
1365
July1st to 15thNight
7%5%35%5%2445%7%48%
1365
16th to endNight
5%4144345%5%8%52%
1525
August1st to 15thNight
9%4244345%5%8%48%
1568
16th to endNight
8%3123235%5%8%54%
1863
September1st to 15thNight
11%7%14313347%49%
1977
16th to endNight
10%6%25%4245%5%7%45%
2145
October1st to 15thNight
7%10%46%5%35%6%6%7%36%
2297
16th to endNight
36%36%5%346%7%10%42%
2652
November1st to 15thNight
16%37%6%35%5%7%10%43%
2571
16th to endNight
16%5%6%6%35%5%7%11%40%
2918
December1st to 15thNight
15%38%7%36%5%7%11%38%
2925
16th to endNight
5%410%7%46%6%7%9%36%
3120

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
16%37%5%35%6%7%12%40%
1358
16th to endDay
6%48%7%36%6%6%10%38%
1658
February1st to 15thDay
15%5%9%6%36%7%8%11%34%
1561
16th to endDay
16%5%12%8%46%5%6%10%31%
1646
March1st to 15thDay
16%5%8%6%36%5%8%10%37%
1981
16th to endDay
415%6%10%6%5%6%5%6%8%24%
2332
April1st to 15thDay
8%16%6%8%5%346%7%8%24%
2407
16th to endDay
10%18%5%7%434447%28%
2498
May1st to 15thDay
9%15%46%5%35%45%7%30%
2720
16th to endDay
23%11%37%6%35%5%5%6%22%
3042
June1st to 15thDay
20%11%37%5%45%45%7%23%
2925
16th to endDay
15%7%47%7%35%5%6%7%28%
2925
July1st to 15thDay
11%5%36%6%37%6%6%8%34%
2925
16th to endDay
6%5%245%35%7%6%6%44%
2994
August1st to 15thDay
11%6%25%5%35%6%6%8%35%
2644
16th to endDay
10%4244345%6%7%45%
2691
September1st to 15thDay
12%8%15%424335%46%
2311
16th to endDay
11%8%14425%45%7%43%
2145
October1st to 15thDay
8%14%36%7%2446%8%33%
1992
16th to endDay
5%9%35%5%346%8%9%39%
1828
November1st to 15thDay
37%47%6%35%46%9%41%
1605
16th to endDay
27%48%6%2445%9%43%
1371
December1st to 15thDay
17%47%7%36%5%8%11%38%
1365
16th to endDay
6%5%10%6%45%5%7%9%38%
1456
January1st to 15thNight
17%39%6%45%6%7%10%37%
2910
16th to endNight
16%47%7%46%5%7%8%41%
2928
February1st to 15thNight
8%37%6%35%6%7%9%39%
2621
16th to endNight
18%49%6%46%6%6%8%38%
2114
March1st to 15thNight
15%47%6%45%5%7%10%41%
2308
16th to endNight
29%6%10%6%35%6%6%9%34%
2243
April1st to 15thNight
6%14%6%7%43446%8%33%
1870
16th to endNight
7%12%6%7%6%3345%8%36%
1737
May1st to 15thNight
7%9%5%6%5%345%6%7%38%
1559
16th to endNight
21%8%25%5%3436%7%30%
1421
June1st to 15thNight
15%8%37%5%235%46%35%
1365
16th to endNight
12%5%24435%6%6%6%41%
1365
July1st to 15thNight
9%5%245%1435%7%49%
1365
16th to endNight
6%31342446%8%53%
1525
August1st to 15thNight
9%5%14325%45%7%49%
1568
16th to endNight
9%41221346%8%55%
1863
September1st to 15thNight
11%7%13313346%51%
1977
16th to endNight
10%7%244225%5%7%46%
2145
October1st to 15thNight
8%11%45%5%35%5%5%8%37%
2297
16th to endNight
47%36%425%5%6%9%45%
2652
November1st to 15thNight
26%46%5%35%46%9%44%
2571
16th to endNight
26%47%6%345%6%11%41%
2918
December1st to 15thNight
16%47%7%36%6%7%9%40%
2925
16th to endNight
6%49%6%46%6%7%8%37%
3120

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
35%13%22%21%5%2
1358
16th to endDay
38%11%18%19%9%2
1658
February1st to 15thDay
38%11%21%18%7%3
1561
16th to endDay
47%10%15%17%8%
1646
March1st to 15thDay
39%12%22%18%6%
1981
16th to endDay
56%10%15%12%4
2332
April1st to 15thDay
55%10%16%11%5%
2407
16th to endDay
54%7%16%15%4
2498
May1st to 15thDay
52%7%15%18%5%
2720
16th to endDay
62%7%12%13%4
3047
June1st to 15thDay
60%9%11%12%6%
2925
16th to endDay
53%9%12%15%6%1
2925
July1st to 15thDay
44%9%14%18%10%1
2766
16th to endDay
36%10%13%22%15%1
2822
August1st to 15thDay
42%11%15%21%7%1
2627
16th to endDay
34%9%14%28%11%1
2691
September1st to 15thDay
39%7%14%22%14%1
2311
16th to endDay
38%9%15%24%10%1
2145
October1st to 15thDay
48%10%14%17%9%
1992
16th to endDay
36%11%19%21%9%
1828
November1st to 15thDay
38%11%22%19%7%
1605
16th to endDay
36%11%21%19%7%2
1371
December1st to 15thDay
38%12%22%16%8%1
1365
16th to endDay
40%9%17%20%10%1
1456
January1st to 15thNight
39%14%21%15%5%2
2910
16th to endNight
37%10%16%18%13%3
2928
February1st to 15thNight
38%11%18%19%9%2
2632
16th to endNight
41%10%15%19%12%1
2114
March1st to 15thNight
35%12%23%20%7%1
2308
16th to endNight
44%11%18%17%7%
2243
April1st to 15thNight
47%9%17%17%7%
1870
16th to endNight
47%8%16%19%6%1
1737
May1st to 15thNight
43%10%14%25%6%
1560
16th to endNight
52%7%15%18%5%
1421
June1st to 15thNight
48%9%13%18%9%
1365
16th to endNight
38%10%16%24%8%
1365
July1st to 15thNight
34%6%16%29%11%1
1295
16th to endNight
26%9%16%28%16%1
1434
August1st to 15thNight
31%7%16%32%11%1
1560
16th to endNight
24%7%17%33%15%1
1863
September1st to 15thNight
33%5%17%25%15%2
1977
16th to endNight
35%7%17%24%11%2
2145
October1st to 15thNight
43%10%14%19%11%
2297
16th to endNight
33%11%18%25%10%
2652
November1st to 15thNight
36%11%19%21%10%
2571
16th to endNight
36%13%21%17%8%3
2918
December1st to 15thNight
38%12%19%21%7%2
2925
16th to endNight
40%10%17%19%9%1
3120

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
46%33%35%11%8%
90
16th to endDay
5%32%36%17%35%
96
February1st to 15thDay
329%45%12%42
101
16th to endDay
323%33%28%10%
227
March1st to 15thDay
10%32%35%13%6%1
330
16th to endDay
16%33%32%16%1
352
April1st to 15thDay
21%25%32%17%3
329
16th to endDay
28%18%26%14%8%3
318
May1st to 15thDay
19%14%27%22%12%3
403
16th to endDay
27%9%18%21%18%4
597
June1st to 15thDay
22%20%25%19%10%1
570
16th to endDay
17%18%30%19%10%3
570
July1st to 15thDay
16%13%29%23%14%2
550
16th to endDay
10%16%31%24%12%2
503
August1st to 15thDay
17%9%31%27%11%2
359
16th to endDay
17%16%30%26%7%2
396
September1st to 15thDay
20%18%33%18%7%2
375
16th to endDay
21%21%30%17%7%1
375
October1st to 15thDay
23%17%31%18%8%
274
16th to endDay
14%19%31%17%10%6%
178
November1st to 15thDay
11%26%39%14%5%2
135
16th to endDay
10%32%29%8%8%8%
91
December1st to 15thDay
224%30%27%11%4
90
16th to endDay
9%13%47%21%5%2
96
January1st to 15thNight
8%27%42%16%4
975
16th to endNight
6%29%38%18%5%1
848
February1st to 15thNight
5%23%34%21%11%2
764
16th to endNight
6%15%39%26%11%
684
March1st to 15thNight
5%24%40%20%7%1
780
16th to endNight
8%18%35%27%8%1
832
April1st to 15thNight
13%19%28%30%7%1
700
16th to endNight
13%13%29%27%12%2
579
May1st to 15thNight
11%12%24%33%15%2
445
16th to endNight
24%7%18%25%21%2
407
June1st to 15thNight
20%10%24%27%15%1
390
16th to endNight
14%10%25%27%20%1
390
July1st to 15thNight
13%6%21%34%22%1
370
16th to endNight
9%6%20%36%26%1
408
August1st to 15thNight
13%215%33%31%3
416
16th to endNight
11%11%19%34%20%2
621
September1st to 15thNight
17%8%19%27%18%8%
747
16th to endNight
14%14%26%27%11%5%
776
October1st to 15thNight
15%15%27%27%11%2
780
16th to endNight
10%21%32%26%6%2
816
November1st to 15thNight
10%29%39%12%6%1
861
16th to endNight
8%28%42%15%41
975
December1st to 15thNight
6%24%39%20%7%2
975
16th to endNight
5%26%40%19%6%1
1040
Page generated at 2018-10-28 06:41:06. Version ac04

Copyright 2018 A. Danko


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