Blue Springs Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Blue Springs Camp clear sky chart from 2005-11-05 to

2017-09-12
.

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
29%
14825
14%
46600
8%
14787
37%
14787
18%
32498

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
9%
718
9%
2445
2%
716
17%
716
6%
1932
January16th to endNight
12%
768
12%
2496
3%
768
21%
768
8%
1961
February1st to 15thNight
12%
701
9%
2287
2%
701
20%
701
9%
1773
February16th to endNight
16%
631
12%
2003
3%
631
26%
631
11%
1499
March1st to 15thNight
19%
720
13%
1986
5%
720
27%
720
15%
1477
March16th to endNight
26%
768
21%
2112
8%
768
36%
768
22%
1452
April1st to 15thNight
22%
718
15%
1835
4%
718
29%
718
20%
1335
April16th to endNight
32%
540
20%
1620
7%
540
41%
540
24%
1049
May1st to 15thNight
40%
520
17%
1600
10%
520
48%
520
23%
1072
May16th to endNight
42%
374
17%
1497
12%
374
54%
374
24%
851
June1st to 15thNight
40%
360
13%
1440
10%
360
52%
360
20%
860
June16th to endNight
45%
360
15%
1275
13%
360
55%
360
27%
741
July1st to 15thNight
57%
340
18%
1276
22%
340
63%
340
36%
650
July16th to endNight
51%
523
15%
1554
11%
490
55%
490
30%
919
August1st to 15thNight
59%
539
18%
1609
11%
536
65%
536
36%
928
August16th to endNight
53%
609
24%
1755
14%
609
59%
609
35%
1054
September1st to 15thNight
49%
707
21%
1801
10%
707
55%
707
34%
1158
September16th to endNight
49%
657
21%
1822
14%
657
53%
657
31%
1128
October1st to 15thNight
35%
660
18%
1980
13%
660
43%
660
22%
1339
October16th to endNight
19%
704
13%
2112
5%
704
28%
704
13%
1582
November1st to 15thNight
30%
700
18%
2367
14%
700
37%
700
17%
1585
November16th to endNight
21%
720
10%
2520
6%
720
28%
720
11%
1899
December1st to 15thNight
12%
720
6%
2520
1%
720
18%
720
7%
2016
December16th to endNight
9%
768
6%
2688
1%
768
15%
768
5%
2238

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
15%9%47%6%35%45%7%30%
48048
Night
14%8%47%5%35%45%6%34%
46779
Cloud CoverDay
14%9%47%6%35%45%7%30%
48058
Night
14%8%47%6%35%45%6%34%
46783
TransparencyDay
50%7%12%18%9%
47746
Night
47%7%12%20%10%1
46600
SeeingDay
16%13%29%23%11%4
5540
Night
17%15%31%23%10%1
14831

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
16%15%8%11%8%34435%18%
1492
16th to endDay
11%18%8%11%9%5%5%44416%
1728
February1st to 15thDay
14%16%6%12%10%3444416%
1575
16th to endDay
17%14%5%9%7%36%346%21%
1470
March1st to 15thDay
15%13%6%9%6%34345%26%
1963
16th to endDay
15%10%46%6%24446%32%
2112
April1st to 15thDay
20%11%36%5%33446%30%
2121
16th to endDay
18%9%35%423346%37%
2340
May1st to 15thDay
17%8%36%43445%6%34%
2349
16th to endDay
13%5%36%5%35%5%5%7%39%
2618
June1st to 15thDay
16%6%26%5%245%5%8%36%
2520
16th to endDay
13%425%6%46%5%6%9%36%
2679
July1st to 15thDay
9%5%25%5%45%5%7%9%39%
2604
16th to endDay
11%5%36%6%36%5%6%9%35%
2505
August1st to 15thDay
10%6%25%7%46%5%6%8%36%
2340
16th to endDay
13%6%26%5%35%5%5%8%36%
2435
September1st to 15thDay
15%6%26%5%3345%7%37%
2076
16th to endDay
16%6%35%5%24448%37%
1807
October1st to 15thDay
20%8%36%5%3444433%
1650
16th to endDay
25%12%48%5%34345%21%
1760
November1st to 15thDay
14%11%37%6%35%46%6%29%
1488
16th to endDay
19%14%6%7%7%25%45%6%20%
1440
December1st to 15thDay
16%19%7%11%6%24445%14%
1440
16th to endDay
19%17%8%10%7%46%44313%
1536
January1st to 15thNight
19%13%6%9%7%36%45%5%18%
2445
16th to endNight
12%12%8%11%8%45%5%5%5%19%
2496
February1st to 15thNight
13%12%5%11%8%36%445%22%
2285
16th to endNight
14%12%5%9%7%345%5%5%25%
2003
March1st to 15thNight
17%8%47%5%36%45%5%30%
1974
16th to endNight
14%8%45%434245%41%
2112
April1st to 15thNight
18%9%45%5%24346%34%
1835
16th to endNight
12%8%25%6%335%45%42%
1620
May1st to 15thNight
16%5%15%5%35%45%6%39%
1600
16th to endNight
11%4244245%5%7%47%
1495
June1st to 15thNight
12%425%4346%7%7%41%
1440
16th to endNight
9%5%25%5%2435%8%46%
1275
July1st to 15thNight
5%3134243410%55%
1353
16th to endNight
8%324425%45%8%48%
1661
August1st to 15thNight
6%314335%5%6%8%51%
1620
16th to endNight
9%5%244335%35%51%
1755
September1st to 15thNight
11%42342446%7%47%
1801
16th to endNight
14%5%1442345%7%46%
1822
October1st to 15thNight
17%6%26%5%24347%39%
1980
16th to endNight
20%10%36%5%3445%6%29%
2112
November1st to 15thNight
15%7%35%5%35%5%5%7%34%
2367
16th to endNight
19%10%48%7%25%447%24%
2520
December1st to 15thNight
19%15%5%8%6%35%45%6%19%
2520
16th to endNight
20%15%7%12%6%35%5%45%14%
2688

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
15%15%8%11%8%43445%18%
1492
16th to endDay
11%18%8%12%9%5%5%44415%
1728
February1st to 15thDay
14%16%7%12%9%44445%16%
1575
16th to endDay
17%13%5%9%7%45%35%6%21%
1470
March1st to 15thDay
15%13%5%9%6%35%345%27%
1974
16th to endDay
14%11%47%6%34445%32%
2111
April1st to 15thDay
19%10%46%5%33447%29%
2121
16th to endDay
18%10%35%423446%37%
2340
May1st to 15thDay
17%8%36%5%35%446%34%
2349
16th to endDay
12%6%36%6%345%6%7%38%
2618
June1st to 15thDay
15%6%25%5%245%5%8%36%
2520
16th to endDay
12%5%25%5%45%5%6%9%35%
2679
July1st to 15thDay
9%435%5%35%5%7%9%38%
2604
16th to endDay
10%6%35%6%46%5%6%9%35%
2505
August1st to 15thDay
9%6%26%7%46%5%6%8%36%
2340
16th to endDay
12%7%26%5%35%5%6%8%36%
2435
September1st to 15thDay
14%6%36%5%345%5%7%37%
2076
16th to endDay
15%7%35%5%34448%37%
1807
October1st to 15thDay
19%8%47%5%3434433%
1650
16th to endDay
25%11%47%6%35%345%21%
1760
November1st to 15thDay
13%12%38%5%35%5%5%6%29%
1488
16th to endDay
17%14%6%8%6%35%45%6%20%
1440
December1st to 15thDay
16%18%8%11%7%34446%14%
1440
16th to endDay
19%16%7%10%8%5%5%44312%
1536
January1st to 15thNight
18%14%6%8%8%35%446%18%
2445
16th to endNight
12%12%8%12%8%45%5%5%6%19%
2496
February1st to 15thNight
13%11%5%11%8%36%446%22%
2278
16th to endNight
13%12%49%7%35%5%45%25%
2003
March1st to 15thNight
17%8%47%5%35%5%5%5%30%
1986
16th to endNight
13%8%46%43425%441%
2112
April1st to 15thNight
18%9%45%5%35%346%34%
1835
16th to endNight
11%7%25%6%335%45%42%
1620
May1st to 15thNight
15%6%15%5%45%45%6%39%
1599
16th to endNight
11%4144245%5%7%47%
1495
June1st to 15thNight
11%5%25%5%346%7%7%40%
1440
16th to endNight
10%425%5%2445%8%47%
1275
July1st to 15thNight
5%3134244410%55%
1353
16th to endNight
8%32443445%8%48%
1661
August1st to 15thNight
6%314425%5%6%7%51%
1620
16th to endNight
9%415%4245%45%51%
1755
September1st to 15thNight
11%42342445%7%47%
1801
16th to endNight
13%6%1442345%7%46%
1822
October1st to 15thNight
16%6%26%5%24447%38%
1980
16th to endNight
20%9%36%5%3445%6%29%
2112
November1st to 15thNight
14%8%35%5%35%5%5%7%34%
2367
16th to endNight
18%9%48%7%25%45%6%25%
2520
December1st to 15thNight
19%15%48%6%35%5%5%6%19%
2520
16th to endNight
19%14%7%11%7%35%445%14%
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
66%7%10%10%5%
1493
16th to endDay
68%6%9%8%6%
1728
February1st to 15thDay
66%8%8%12%3
1577
16th to endDay
61%7%10%13%6%1
1470
March1st to 15thDay
58%6%12%14%7%
1974
16th to endDay
51%6%9%18%11%1
2112
April1st to 15thDay
53%5%11%18%10%
2121
16th to endDay
47%410%20%14%2
2340
May1st to 15thDay
47%6%11%22%10%
2349
16th to endDay
42%7%14%20%14%1
2622
June1st to 15thDay
42%8%11%24%12%
2520
16th to endDay
41%7%15%22%12%
2679
July1st to 15thDay
36%8%13%23%16%1
2453
16th to endDay
43%8%13%22%10%2
2349
August1st to 15thDay
41%9%15%18%12%1
2327
16th to endDay
41%8%15%23%10%
2435
September1st to 15thDay
43%6%14%23%10%
2076
16th to endDay
44%6%12%26%9%
1807
October1st to 15thDay
52%5%10%19%10%1
1650
16th to endDay
62%7%12%13%4
1760
November1st to 15thDay
49%7%15%18%7%
1488
16th to endDay
60%8%13%13%4
1440
December1st to 15thDay
68%7%11%10%2
1440
16th to endDay
71%7%9%9%2
1536
January1st to 15thNight
62%8%10%11%5%
2445
16th to endNight
61%8%10%13%5%
2496
February1st to 15thNight
59%7%11%15%5%
2287
16th to endNight
55%7%11%16%7%
2003
March1st to 15thNight
53%6%12%19%7%
1986
16th to endNight
45%5%8%22%16%2
2112
April1st to 15thNight
49%5%10%18%14%
1835
16th to endNight
41%5%10%20%18%3
1620
May1st to 15thNight
43%6%9%23%14%2
1600
16th to endNight
34%7%14%26%14%3
1497
June1st to 15thNight
38%7%11%24%17%
1440
16th to endNight
34%6%13%27%16%1
1275
July1st to 15thNight
24%7%11%29%24%2
1276
16th to endNight
32%8%14%25%15%3
1554
August1st to 15thNight
28%7%17%31%12%2
1609
16th to endNight
32%6%10%31%17%1
1755
September1st to 15thNight
33%7%13%29%14%1
1801
16th to endNight
36%5%12%31%13%1
1822
October1st to 15thNight
45%6%10%24%13%
1980
16th to endNight
53%8%12%18%6%
2112
November1st to 15thNight
45%7%13%19%12%1
2367
16th to endNight
55%9%14%14%5%
2520
December1st to 15thNight
60%11%12%11%3
2520
16th to endNight
68%7%10%9%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
12%37%35%10%4
70
16th to endDay
28%27%37%7%
96
February1st to 15thDay
20%42%28%6%2
90
16th to endDay
18%34%38%8%
81
March1st to 15thDay
20%20%33%20%4
264
16th to endDay
20%14%35%19%7%1
288
April1st to 15thDay
21%21%30%18%7%
270
16th to endDay
21%15%31%16%10%4
270
May1st to 15thDay
20%10%30%21%11%5%
288
16th to endDay
11%10%36%22%13%4
331
June1st to 15thDay
17%10%30%27%10%3
315
16th to endDay
13%13%31%29%10%2
474
July1st to 15thDay
9%6%29%34%13%6%
387
16th to endDay
9%5%30%28%18%7%
326
August1st to 15thDay
10%326%28%20%10%
313
16th to endDay
13%5%20%27%20%12%
332
September1st to 15thDay
12%6%24%25%20%10%
299
16th to endDay
18%8%19%26%16%10%
254
October1st to 15thDay
20%14%27%19%14%4
255
16th to endDay
28%17%29%18%5%
272
November1st to 15thDay
11%18%40%19%7%2
81
16th to endDay
21%26%28%16%6%
60
December1st to 15thDay
26%38%23%11%
60
16th to endDay
25%42%29%3
64
January1st to 15thNight
23%29%32%12%1
720
16th to endNight
17%21%38%18%4
768
February1st to 15thNight
19%27%33%16%2
704
16th to endNight
18%21%36%19%4
631
March1st to 15thNight
22%20%33%20%3
720
16th to endNight
17%16%35%22%8%
768
April1st to 15thNight
21%17%35%21%4
718
16th to endNight
13%12%36%26%9%1
540
May1st to 15thNight
15%10%26%30%14%1
520
16th to endNight
14%5%32%30%16%
375
June1st to 15thNight
12%8%31%33%13%
360
16th to endNight
9%434%37%13%
360
July1st to 15thNight
5%429%39%20%1
340
16th to endNight
9%330%35%19%1
523
August1st to 15thNight
7%124%38%23%3
539
16th to endNight
11%423%29%26%3
609
September1st to 15thNight
12%7%26%28%19%5%
707
16th to endNight
14%9%21%28%21%4
657
October1st to 15thNight
18%12%30%22%13%2
660
16th to endNight
25%17%34%19%3
704
November1st to 15thNight
17%16%29%25%9%1
700
16th to endNight
21%22%29%19%5%
720
December1st to 15thNight
27%25%31%13%3
720
16th to endNight
26%25%31%13%3
768
Page generated at 2017-09-13 07:39:08. Version ac04

Copyright 2017 A. Danko


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