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 2018-03-21.

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
29%
15586
14%
49024
8%
15548
37%
15548
17%
34151

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
10%
778
9%
2650
2%
776
18%
776
7%
2068
January16th to endNight
12%
832
11%
2704
3%
832
22%
832
8%
2109
February1st to 15thNight
12%
761
9%
2482
2%
761
20%
761
9%
1923
February16th to endNight
15%
683
12%
2168
3%
683
25%
683
11%
1623
March1st to 15thNight
20%
780
13%
2151
5%
780
27%
780
15%
1592
March16th to endNight
26%
792
21%
2178
9%
792
37%
792
23%
1484
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
50%
720
21%
1836
10%
720
56%
720
34%
1177
September16th to endNight
50%
717
23%
1988
17%
717
55%
717
32%
1217
October1st to 15thNight
36%
720
18%
2160
13%
720
43%
720
22%
1460
October16th to endNight
20%
768
15%
2304
7%
768
30%
768
14%
1707
November1st to 15thNight
30%
760
17%
2570
13%
760
37%
760
17%
1743
November16th to endNight
20%
780
10%
2730
5%
780
28%
780
11%
2027
December1st to 15thNight
12%
780
6%
2730
1%
780
18%
780
7%
2166
December16th to endNight
9%
832
6%
2912
1%
832
15%
832
5%
2396

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%
49813
Night
14%8%47%5%35%45%6%34%
49203
Cloud CoverDay
14%9%47%6%3445%7%30%
49823
Night
14%8%47%6%35%45%6%34%
49207
TransparencyDay
50%7%12%18%9%
49511
Night
47%7%12%20%11%1
49024
SeeingDay
16%14%29%22%11%4
6118
Night
17%16%31%23%10%1
15592

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%34445%18%
1617
16th to endDay
11%18%8%11%9%5%5%44416%
1872
February1st to 15thDay
14%16%6%12%10%3444416%
1710
16th to endDay
18%13%5%9%7%35%346%22%
1591
March1st to 15thDay
15%13%6%9%6%34345%26%
2127
16th to endDay
14%10%46%6%34446%33%
2174
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
14%6%26%5%3345%7%38%
2121
16th to endDay
15%6%25%5%24448%39%
1971
October1st to 15thDay
20%8%46%6%3434433%
1800
16th to endDay
24%11%47%5%34445%23%
1920
November1st to 15thDay
14%12%37%6%35%46%6%28%
1615
16th to endDay
18%14%6%6%6%25%45%6%21%
1560
December1st to 15thDay
15%18%7%12%7%25%45%5%15%
1560
16th to endDay
19%17%7%11%7%46%44313%
1664
January1st to 15thNight
18%13%6%8%7%36%45%5%19%
2650
16th to endNight
12%12%8%11%7%45%5%5%5%19%
2704
February1st to 15thNight
13%12%5%11%8%36%445%22%
2480
16th to endNight
14%12%5%8%8%345%5%5%25%
2168
March1st to 15thNight
17%7%5%7%5%36%45%5%30%
2139
16th to endNight
13%8%45%434245%41%
2178
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%48%
1836
16th to endNight
13%5%2442345%7%48%
1988
October1st to 15thNight
17%6%26%5%24346%39%
2160
16th to endNight
19%10%36%5%34446%30%
2304
November1st to 15thNight
15%8%35%5%35%5%5%7%33%
2570
16th to endNight
18%10%47%6%25%45%8%25%
2730
December1st to 15thNight
19%14%5%8%6%35%45%6%19%
2730
16th to endNight
19%15%7%11%6%35%445%14%
2912

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%
1617
16th to endDay
11%17%8%12%9%45%445%16%
1872
February1st to 15thDay
14%15%7%12%9%44445%16%
1710
16th to endDay
17%12%5%9%7%45%346%22%
1591
March1st to 15thDay
15%13%6%9%6%35%34426%
2138
16th to endDay
13%11%46%6%34445%33%
2173
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%26%5%3345%7%38%
2121
16th to endDay
14%6%35%5%24448%39%
1971
October1st to 15thDay
20%8%47%5%3434432%
1800
16th to endDay
24%11%47%6%25%445%22%
1920
November1st to 15thDay
13%12%37%6%35%5%5%6%28%
1615
16th to endDay
16%14%6%7%6%35%45%6%21%
1560
December1st to 15thDay
15%18%8%11%7%34445%15%
1560
16th to endDay
19%16%7%10%8%5%5%44412%
1664
January1st to 15thNight
18%13%5%8%8%35%446%19%
2650
16th to endNight
12%11%7%12%8%45%5%5%6%19%
2704
February1st to 15thNight
12%11%5%11%8%47%446%22%
2473
16th to endNight
14%12%49%7%35%5%5%5%25%
2168
March1st to 15thNight
17%8%5%7%6%36%5%5%5%30%
2151
16th to endNight
13%8%45%43425%441%
2178
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%42343445%7%48%
1836
16th to endNight
12%5%1442335%7%47%
1988
October1st to 15thNight
17%6%25%5%24447%38%
2160
16th to endNight
19%9%36%5%35%446%30%
2304
November1st to 15thNight
15%8%35%5%35%5%6%7%33%
2570
16th to endNight
18%9%48%7%25%5%5%7%26%
2730
December1st to 15thNight
18%14%5%8%6%45%5%5%6%19%
2730
16th to endNight
19%14%7%11%7%35%445%14%
2912

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%9%6%
1618
16th to endDay
68%6%9%8%6%
1872
February1st to 15thDay
66%7%8%12%3
1712
16th to endDay
60%6%10%13%7%1
1591
March1st to 15thDay
58%6%11%14%8%
2138
16th to endDay
50%6%9%19%12%1
2174
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%24%10%
2121
16th to endDay
43%7%12%26%10%
1971
October1st to 15thDay
52%5%10%19%10%1
1800
16th to endDay
61%7%12%13%5%
1920
November1st to 15thDay
51%7%14%18%7%
1615
16th to endDay
58%8%14%13%5%
1560
December1st to 15thDay
67%7%11%10%3
1560
16th to endDay
70%7%9%9%2
1664
January1st to 15thNight
61%7%11%11%7%
2650
16th to endNight
60%8%11%14%5%
2704
February1st to 15thNight
59%7%11%15%5%
2482
16th to endNight
55%7%11%16%7%
2168
March1st to 15thNight
52%6%12%19%7%1
2151
16th to endNight
44%5%8%22%16%2
2178
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
1836
16th to endNight
34%5%12%32%13%1
1988
October1st to 15thNight
45%5%10%23%14%
2160
16th to endNight
52%7%12%19%7%
2304
November1st to 15thNight
46%7%13%19%11%1
2570
16th to endNight
53%9%15%14%6%
2730
December1st to 15thNight
59%11%13%11%4
2730
16th to endNight
67%7%10%9%3
2912

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
15%37%28%15%3
105
16th to endDay
25%29%36%8%
144
February1st to 15thDay
22%42%26%6%1
135
16th to endDay
20%37%36%5%
120
March1st to 15thDay
20%19%33%20%5%
323
16th to endDay
19%14%37%19%7%1
311
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
11%6%23%25%21%11%
315
16th to endDay
15%7%19%23%20%13%
314
October1st to 15thDay
20%14%27%17%13%5%
315
16th to endDay
26%18%30%18%5%
336
November1st to 15thDay
16%19%37%17%6%1
118
16th to endDay
18%26%36%12%5%
90
December1st to 15thDay
25%35%26%12%
90
16th to endDay
25%39%28%7%
96
January1st to 15thNight
22%28%33%13%2
780
16th to endNight
17%22%37%17%4
832
February1st to 15thNight
18%29%33%15%2
764
16th to endNight
19%22%35%18%3
683
March1st to 15thNight
21%20%33%20%4
780
16th to endNight
16%16%36%22%7%
792
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%25%28%20%5%
720
16th to endNight
13%9%19%27%22%6%
717
October1st to 15thNight
19%11%29%22%14%2
720
16th to endNight
23%18%33%20%3
768
November1st to 15thNight
19%16%28%25%9%1
760
16th to endNight
20%23%29%19%5%
780
December1st to 15thNight
26%25%30%13%3
780
16th to endNight
25%25%31%13%2
832
Page generated at 2018-03-22 11:34:21. Version ac04

Copyright 2018 A. Danko


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