Barnes City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Barnes City clear sky chart from 2005-11-05 to 2017-09-18.

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
39%
15990
19%
46895
11%
15945
46%
15945
27%
30047

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
28%
900
16%
2485
6%
895
36%
895
24%
1692
January16th to endNight
23%
960
17%
2496
5%
960
31%
960
21%
1772
February1st to 15thNight
24%
878
14%
2288
4%
876
31%
876
22%
1635
February16th to endNight
28%
696
20%
1958
8%
696
38%
696
27%
1263
March1st to 15thNight
31%
583
20%
2023
13%
583
41%
583
23%
1235
March16th to endNight
27%
576
11%
2088
6%
576
34%
576
14%
1462
April1st to 15thNight
28%
539
17%
1797
11%
539
38%
539
22%
1150
April16th to endNight
31%
540
18%
1767
11%
540
44%
540
21%
1204
May1st to 15thNight
36%
540
17%
1545
9%
540
44%
540
25%
1032
May16th to endNight
42%
563
20%
1497
9%
561
50%
561
31%
982
June1st to 15thNight
58%
540
16%
1440
8%
540
61%
540
35%
900
June16th to endNight
53%
540
18%
1440
9%
540
56%
540
38%
879
July1st to 15thNight
70%
510
18%
1360
11%
510
72%
510
46%
778
July16th to endNight
72%
564
23%
1504
19%
531
75%
531
45%
824
August1st to 15thNight
69%
539
22%
1610
22%
536
73%
536
40%
883
August16th to endNight
67%
573
22%
1857
25%
573
70%
573
35%
1043
September1st to 15thNight
60%
540
28%
1800
27%
540
67%
540
36%
963
September16th to endNight
53%
559
25%
1835
18%
559
62%
559
36%
999
October1st to 15thNight
42%
660
26%
1980
19%
660
48%
660
31%
1202
October16th to endNight
35%
704
21%
2112
11%
704
44%
704
28%
1302
November1st to 15thNight
36%
726
26%
2285
14%
726
48%
726
31%
1319
November16th to endNight
28%
900
17%
2520
8%
900
36%
900
25%
1671
December1st to 15thNight
21%
900
13%
2520
4%
900
29%
900
18%
1836
December16th to endNight
25%
960
15%
2688
6%
960
33%
960
16%
2021

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%7%36%5%3445%7%38%
47901
Night
12%7%35%424446%43%
47072
Cloud CoverDay
13%7%36%5%3445%7%38%
47910
Night
12%7%35%434446%43%
47076
TransparencyDay
44%5%13%22%12%1
47596
Night
40%413%24%14%2
46896
SeeingDay
15%7%28%27%17%4
6011
Night
15%7%31%31%12%1
15992

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
10%8%5%9%8%445%47%31%
1450
16th to endDay
13%13%6%8%8%34446%26%
1728
February1st to 15thDay
11%12%5%7%5%24447%31%
1575
16th to endDay
12%9%47%5%24446%37%
1515
March1st to 15thDay
13%9%46%6%24446%34%
1936
16th to endDay
20%11%36%424347%31%
2136
April1st to 15thDay
18%9%35%5%24446%34%
2151
16th to endDay
23%9%35%424447%30%
2190
May1st to 15thDay
19%7%46%5%2445%6%32%
2406
16th to endDay
14%5%26%5%45%45%6%37%
2617
June1st to 15thDay
12%5%35%5%345%6%8%39%
2520
16th to endDay
8%425%5%35%6%6%9%42%
2520
July1st to 15thDay
8%425%4345%6%10%45%
2520
16th to endDay
6%315%5%25%5%7%9%46%
2559
August1st to 15thDay
6%5%24446%6%7%10%42%
2340
16th to endDay
10%5%25%6%34447%44%
2345
September1st to 15thDay
12%423322447%51%
2160
16th to endDay
10%424435%446%48%
1835
October1st to 15thDay
15%6%25%42324448%
1650
16th to endDay
16%8%25%433346%42%
1760
November1st to 15thDay
10%7%25%434447%46%
1572
16th to endDay
18%8%35%413348%37%
1440
December1st to 15thDay
18%12%6%8%4245%36%27%
1440
16th to endDay
17%16%410%5%3443424%
1536
January1st to 15thNight
9%9%46%6%3445%7%37%
2485
16th to endNight
10%12%5%7%6%34346%36%
2496
February1st to 15thNight
13%12%46%5%24346%35%
2285
16th to endNight
12%8%26%424246%44%
1958
March1st to 15thNight
14%7%25%5%23245%45%
2011
16th to endNight
17%8%48%6%35%445%32%
2088
April1st to 15thNight
15%7%35%5%2435%5%40%
1797
16th to endNight
19%8%34424445%37%
1767
May1st to 15thNight
15%5%25%435%45%7%39%
1545
16th to endNight
11%5%345%3445%8%44%
1496
June1st to 15thNight
6%5%25%425%46%9%46%
1440
16th to endNight
7%324426%5%6%10%47%
1440
July1st to 15thNight
422325%5%5%10%55%
1440
16th to endNight
5%21332446%9%54%
1607
August1st to 15thNight
3414424448%55%
1620
16th to endNight
8%324425%45%8%51%
1857
September1st to 15thNight
10%323413346%55%
1800
16th to endNight
8%413324348%53%
1835
October1st to 15thNight
13%5%24423345%50%
1980
16th to endNight
13%6%34432245%47%
2112
November1st to 15thNight
10%7%23323345%52%
2285
16th to endNight
16%7%35%424336%42%
2520
December1st to 15thNight
16%12%48%5%2433433%
2520
16th to endNight
19%11%47%5%34445%30%
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
10%9%49%7%45%5%47%31%
1450
16th to endDay
13%13%6%8%7%34446%26%
1728
February1st to 15thDay
11%12%5%7%5%24447%32%
1575
16th to endDay
12%8%47%5%25%5%45%38%
1515
March1st to 15thDay
14%9%46%6%2445%6%34%
1947
16th to endDay
20%10%36%424346%31%
2134
April1st to 15thDay
18%9%35%5%24346%34%
2151
16th to endDay
23%9%26%5%24447%31%
2190
May1st to 15thDay
19%7%36%5%25%45%6%31%
2406
16th to endDay
14%6%26%5%45%46%6%37%
2617
June1st to 15thDay
12%5%25%5%35%5%6%8%39%
2520
16th to endDay
8%425%5%35%6%6%9%42%
2520
July1st to 15thDay
7%425%425%5%6%9%45%
2520
16th to endDay
6%415%425%5%7%10%45%
2559
August1st to 15thDay
6%5%245%35%6%7%9%42%
2340
16th to endDay
10%5%25%5%3445%7%44%
2345
September1st to 15thDay
12%42432335%7%51%
2160
16th to endDay
10%423435%447%48%
1835
October1st to 15thDay
14%5%25%423335%47%
1650
16th to endDay
16%7%25%5%33345%42%
1760
November1st to 15thDay
10%7%25%334347%46%
1572
16th to endDay
18%8%25%413448%37%
1440
December1st to 15thDay
18%13%6%7%424446%27%
1440
16th to endDay
17%15%5%9%6%3433424%
1536
January1st to 15thNight
10%8%46%6%35%45%7%37%
2485
16th to endNight
10%12%5%7%5%34446%36%
2496
February1st to 15thNight
13%11%47%5%24436%35%
2278
16th to endNight
13%7%26%424347%44%
1958
March1st to 15thNight
14%7%25%433246%45%
2023
16th to endNight
17%8%5%7%6%35%43432%
2088
April1st to 15thNight
15%8%36%423445%41%
1797
16th to endNight
18%8%345%23445%37%
1767
May1st to 15thNight
15%5%25%345%45%8%38%
1544
16th to endNight
11%5%344445%5%7%44%
1496
June1st to 15thNight
6%5%25%43447%10%45%
1440
16th to endNight
7%214435%5%7%9%47%
1440
July1st to 15thNight
422425%5%5%10%55%
1440
16th to endNight
5%21332346%10%54%
1607
August1st to 15thNight
44244245%48%55%
1620
16th to endNight
8%314425%35%8%51%
1857
September1st to 15thNight
10%423313346%56%
1800
16th to endNight
8%5%13333349%53%
1835
October1st to 15thNight
13%5%24423335%50%
1980
16th to endNight
13%6%35%433346%47%
2112
November1st to 15thNight
10%7%23323345%52%
2285
16th to endNight
16%7%35%334346%41%
2520
December1st to 15thNight
16%12%48%5%2433433%
2520
16th to endNight
19%11%46%5%3444430%
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
51%414%19%10%
1451
16th to endDay
58%5%13%16%6%
1728
February1st to 15thDay
52%415%21%6%
1576
16th to endDay
46%5%15%21%8%1
1515
March1st to 15thDay
48%5%16%19%8%
1947
16th to endDay
54%415%18%6%1
2136
April1st to 15thDay
49%411%25%8%
2151
16th to endDay
53%412%18%9%1
2190
May1st to 15thDay
51%5%13%20%8%
2406
16th to endDay
45%6%13%21%11%2
2621
June1st to 15thDay
41%5%15%22%14%1
2520
16th to endDay
36%7%13%23%17%2
2520
July1st to 15thDay
34%7%15%26%12%3
2371
16th to endDay
30%7%16%26%17%1
2400
August1st to 15thDay
34%8%14%26%14%1
2326
16th to endDay
39%5%11%25%15%3
2345
September1st to 15thDay
31%412%26%21%3
2160
16th to endDay
35%411%30%16%1
1835
October1st to 15thDay
39%210%23%21%1
1650
16th to endDay
43%411%25%13%1
1760
November1st to 15thDay
37%413%25%18%1
1572
16th to endDay
45%318%23%8%
1440
December1st to 15thDay
58%413%16%6%
1440
16th to endDay
64%311%12%7%
1536
January1st to 15thNight
45%416%19%14%
2485
16th to endNight
49%416%19%9%
2496
February1st to 15thNight
50%313%22%10%
2288
16th to endNight
41%314%26%12%1
1958
March1st to 15thNight
41%312%26%13%1
2023
16th to endNight
54%414%16%8%
2088
April1st to 15thNight
44%310%25%13%2
1797
16th to endNight
48%5%10%20%13%2
1767
May1st to 15thNight
42%6%14%23%13%
1545
16th to endNight
37%7%12%23%17%2
1498
June1st to 15thNight
32%7%15%26%14%2
1440
16th to endNight
29%7%13%23%20%4
1440
July1st to 15thNight
23%7%17%31%15%4
1360
16th to endNight
23%6%16%32%20%1
1504
August1st to 15thNight
26%6%14%34%15%2
1610
16th to endNight
29%6%11%25%20%6%
1857
September1st to 15thNight
29%48%29%25%3
1800
16th to endNight
30%312%33%18%2
1835
October1st to 15thNight
36%48%23%22%4
1980
16th to endNight
39%313%25%15%2
2112
November1st to 15thNight
34%312%26%19%4
2285
16th to endNight
44%313%26%10%
2520
December1st to 15thNight
54%313%20%8%
2520
16th to endNight
56%5%11%16%9%
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
25%7%42%17%5%1
90
16th to endDay
21%13%34%26%4
96
February1st to 15thDay
11%25%33%22%7%
90
16th to endDay
22%9%38%17%12%
81
March1st to 15thDay
23%15%43%14%3
90
16th to endDay
38%12%25%16%5%1
120
April1st to 15thDay
21%11%31%24%11%
270
16th to endDay
30%9%29%20%8%1
300
May1st to 15thDay
19%12%35%22%8%2
468
16th to endDay
18%9%29%27%12%2
517
June1st to 15thDay
12%428%29%20%3
495
16th to endDay
9%5%32%31%17%4
495
July1st to 15thDay
8%225%30%22%10%
475
16th to endDay
7%221%34%27%6%
515
August1st to 15thDay
7%221%34%28%6%
493
16th to endDay
11%317%33%26%7%
385
September1st to 15thDay
10%318%32%26%9%
315
16th to endDay
9%330%28%21%5%
164
October1st to 15thDay
12%14%20%35%8%8%
90
16th to endDay
15%7%37%29%10%
96
November1st to 15thDay
45%41%24%15%8%
90
16th to endDay
41%14%27%14%2
90
December1st to 15thDay
24%17%32%16%8%
90
16th to endDay
31%15%38%12%2
96
January1st to 15thNight
13%12%38%25%9%
900
16th to endNight
16%11%38%26%5%
960
February1st to 15thNight
19%9%39%25%6%
880
16th to endNight
17%10%38%26%6%
696
March1st to 15thNight
18%9%35%25%10%1
583
16th to endNight
19%10%36%25%6%
576
April1st to 15thNight
19%11%37%27%4
539
16th to endNight
22%7%33%26%8%
540
May1st to 15thNight
18%6%34%32%7%
540
16th to endNight
12%6%33%32%15%
563
June1st to 15thNight
10%420%46%16%
540
16th to endNight
8%328%40%17%
540
July1st to 15thNight
5%17%44%29%1
510
16th to endNight
5%115%47%27%3
564
August1st to 15thNight
6%114%46%29%2
539
16th to endNight
9%112%42%30%3
573
September1st to 15thNight
12%317%35%25%5%
540
16th to endNight
10%327%32%23%2
559
October1st to 15thNight
16%6%30%29%15%1
660
16th to endNight
16%9%34%29%10%
704
November1st to 15thNight
14%10%35%28%9%
726
16th to endNight
20%11%36%23%8%
900
December1st to 15thNight
22%13%36%23%5%
900
16th to endNight
25%9%31%26%6%
960
Page generated at 2017-09-19 06:32:31. Version ac04

Copyright 2017 A. Danko


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