Carthage
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carthage clear sky chart from 2005-11-05 to 2017-12-02.

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
42%
16103
24%
48060
15%
16057
50%
16057
32%
28599

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
24%
900
24%
2327
8%
895
35%
895
30%
1491
January16th to endNight
26%
960
27%
2496
8%
960
39%
960
33%
1542
February1st to 15thNight
23%
880
20%
2288
5%
876
32%
876
28%
1494
February16th to endNight
22%
630
25%
1892
7%
630
36%
630
26%
1166
March1st to 15thNight
28%
540
21%
1980
11%
540
40%
540
21%
1218
March16th to endNight
26%
576
17%
2112
11%
576
36%
576
20%
1352
April1st to 15thNight
34%
539
22%
1848
14%
539
48%
539
27%
1068
April16th to endNight
31%
540
20%
1770
12%
540
44%
540
25%
1100
May1st to 15thNight
39%
539
20%
1620
16%
539
47%
539
27%
1041
May16th to endNight
46%
562
18%
1685
14%
561
53%
561
29%
1071
June1st to 15thNight
64%
540
20%
1539
16%
540
68%
540
41%
870
June16th to endNight
65%
540
22%
1600
17%
540
70%
540
48%
813
July1st to 15thNight
69%
510
19%
1530
18%
510
71%
510
40%
850
July16th to endNight
79%
564
26%
1594
28%
531
81%
531
44%
847
August1st to 15thNight
76%
539
26%
1610
30%
536
78%
536
42%
869
August16th to endNight
76%
573
27%
1851
32%
573
78%
573
41%
962
September1st to 15thNight
66%
540
27%
1838
30%
540
69%
540
34%
1014
September16th to endNight
60%
540
29%
1983
26%
540
68%
540
31%
1062
October1st to 15thNight
49%
720
28%
2160
21%
720
54%
720
36%
1241
October16th to endNight
41%
768
32%
2304
18%
768
52%
768
37%
1273
November1st to 15thNight
36%
760
31%
2280
15%
760
51%
760
36%
1277
November16th to endNight
29%
973
27%
2650
11%
973
40%
973
32%
1615
December1st to 15thNight
29%
910
20%
2547
7%
910
39%
910
27%
1645
December16th to endNight
25%
960
24%
2556
8%
960
37%
960
26%
1718

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
12%6%2442445%7%44%
48348
Night
11%5%24423347%50%
48255
TransparencyDay
38%6%12%24%15%2
48048
Night
34%411%26%19%3
48060
SeeingDay
12%6%24%29%21%5%
6056
Night
14%8%31%30%14%1
16105

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%6%2442333450%
1611
16th to endDay
13%7%34323347%47%
1728
February1st to 15thDay
12%10%35%5%23345%42%
1575
16th to endDay
11%10%46%334346%41%
1590
March1st to 15thDay
14%10%45%5%23445%40%
1980
16th to endDay
20%10%35%424345%34%
2110
April1st to 15thDay
14%7%24423447%42%
2099
16th to endDay
20%7%36%434445%35%
2188
May1st to 15thDay
18%6%35%5%345%46%37%
2331
16th to endDay
11%6%35%6%35%6%6%7%37%
2430
June1st to 15thDay
8%425%5%35%45%9%45%
2404
16th to endDay
6%213325%5%7%11%51%
2343
July1st to 15thDay
8%414435%5%7%10%43%
2340
16th to endDay
6%3245%35%5%8%10%44%
2466
August1st to 15thDay
7%3145%25%6%6%10%45%
2340
16th to endDay
7%4145%36%6%5%7%47%
2351
September1st to 15thDay
13%5%26%42335%6%46%
2119
16th to endDay
8%425%4245%5%7%48%
1965
October1st to 15thDay
14%5%13324246%51%
1800
16th to endDay
11%5%14213345%55%
1920
November1st to 15thDay
12%5%13322346%53%
1908
16th to endDay
15%6%23312236%51%
1635
December1st to 15thDay
15%7%25%5%24346%43%
1450
16th to endDay
15%9%36%423236%40%
1665
January1st to 15thNight
12%6%245%23345%49%
2327
16th to endNight
10%434323345%52%
2496
February1st to 15thNight
12%8%35%323435%47%
2278
16th to endNight
11%7%35%423346%47%
1892
March1st to 15thNight
14%7%25%42335%6%44%
1980
16th to endNight
17%6%34424346%41%
2112
April1st to 15thNight
10%6%24323347%51%
1848
16th to endNight
15%5%25%423347%43%
1770
May1st to 15thNight
14%6%25%335%346%44%
1619
16th to endNight
11%42442445%9%43%
1683
June1st to 15thNight
5%32342346%8%55%
1539
16th to endNight
311332447%12%56%
1600
July1st to 15thNight
6%313425%5%6%10%51%
1620
16th to endNight
42123245%5%11%54%
1702
August1st to 15thNight
42134245%5%9%55%
1620
16th to endNight
321342446%10%54%
1851
September1st to 15thNight
10%423323348%51%
1838
16th to endNight
8%315%5%23447%53%
1983
October1st to 15thNight
13%412312336%54%
2160
16th to endNight
9%423313345%58%
2304
November1st to 15thNight
12%413223335%58%
2280
16th to endNight
13%6%23323236%52%
2650
December1st to 15thNight
16%6%34313437%44%
2547
16th to endNight
13%8%36%424336%43%
2556

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
38%311%26%18%1
1612
16th to endDay
37%313%27%14%2
1728
February1st to 15thDay
42%5%13%25%11%1
1576
16th to endDay
44%49%23%14%3
1590
March1st to 15thDay
45%49%21%14%3
1980
16th to endDay
52%412%20%9%1
2112
April1st to 15thDay
41%5%13%23%15%1
2099
16th to endDay
49%5%10%19%12%1
2188
May1st to 15thDay
47%6%10%22%12%
2331
16th to endDay
43%9%13%21%11%
2434
June1st to 15thDay
34%8%12%26%16%1
2404
16th to endDay
24%8%17%28%17%2
2343
July1st to 15thDay
33%8%17%26%12%1
2201
16th to endDay
30%8%15%31%13%1
2311
August1st to 15thDay
30%11%14%23%19%1
2326
16th to endDay
34%7%11%26%15%5%
2351
September1st to 15thDay
37%5%11%22%15%6%
2119
16th to endDay
33%7%10%27%17%3
1965
October1st to 15thDay
34%411%23%19%6%
1800
16th to endDay
30%210%29%20%5%
1920
November1st to 15thDay
32%310%26%19%6%
1908
16th to endDay
36%39%22%26%1
1635
December1st to 15thDay
42%411%26%14%
1450
16th to endDay
46%411%20%14%2
1665
January1st to 15thNight
37%39%26%19%2
2327
16th to endNight
34%312%27%18%3
2496
February1st to 15thNight
40%312%25%15%2
2288
16th to endNight
38%310%26%18%2
1892
March1st to 15thNight
41%5%10%19%18%4
1980
16th to endNight
45%411%22%14%1
2112
April1st to 15thNight
34%411%24%20%4
1848
16th to endNight
40%5%12%22%18%1
1770
May1st to 15thNight
40%6%12%22%17%1
1620
16th to endNight
36%7%15%25%12%1
1685
June1st to 15thNight
25%6%15%31%18%2
1539
16th to endNight
20%6%16%33%20%2
1600
July1st to 15thNight
26%6%12%32%19%2
1530
16th to endNight
22%6%12%35%20%1
1594
August1st to 15thNight
23%7%14%29%22%2
1610
16th to endNight
24%6%14%25%22%6%
1851
September1st to 15thNight
31%410%24%19%8%
1838
16th to endNight
31%5%8%26%24%3
1983
October1st to 15thNight
31%410%22%23%7%
2160
16th to endNight
29%37%27%25%6%
2304
November1st to 15thNight
29%38%27%22%8%
2280
16th to endNight
35%37%25%24%4
2650
December1st to 15thNight
41%311%25%17%
2547
16th to endNight
43%310%22%14%4
2556

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
23%17%35%22%1
90
16th to endDay
14%17%41%19%6%
96
February1st to 15thDay
10%21%51%13%4
90
16th to endDay
17%16%37%24%4
81
March1st to 15thDay
18%23%34%20%3
90
16th to endDay
21%17%33%20%6%
96
April1st to 15thDay
18%14%31%27%7%
218
16th to endDay
25%7%36%19%10%
298
May1st to 15thDay
17%10%33%25%10%2
468
16th to endDay
16%7%32%26%14%3
517
June1st to 15thDay
8%422%36%21%5%
495
16th to endDay
6%223%39%22%5%
495
July1st to 15thDay
11%215%36%28%5%
475
16th to endDay
7%8%31%37%14%
515
August1st to 15thDay
9%110%33%37%7%
493
16th to endDay
8%113%34%35%7%
391
September1st to 15thDay
10%112%26%39%10%
274
16th to endDay
11%16%39%19%13%
135
October1st to 15thDay
8%7%28%33%17%5%
135
16th to endDay
9%9%34%36%6%4
144
November1st to 15thDay
19%430%24%19%2
135
16th to endDay
24%13%35%20%6%
135
December1st to 15thDay
15%10%45%17%6%4
94
16th to endDay
22%9%42%21%3
96
January1st to 15thNight
16%16%39%22%5%
900
16th to endNight
14%14%40%26%4
960
February1st to 15thNight
18%14%40%23%2
880
16th to endNight
16%15%41%22%3
630
March1st to 15thNight
18%12%38%25%4
540
16th to endNight
20%10%39%22%6%
576
April1st to 15thNight
15%10%36%31%6%
539
16th to endNight
19%8%38%25%8%
540
May1st to 15thNight
14%6%34%32%11%
540
16th to endNight
12%331%33%16%1
563
June1st to 15thNight
7%220%44%24%1
540
16th to endNight
3125%45%23%
540
July1st to 15thNight
8%14%42%31%1
510
16th to endNight
5%7%40%41%4
564
August1st to 15thNight
6%9%41%38%4
539
16th to endNight
4113%41%36%3
573
September1st to 15thNight
12%112%35%34%3
540
16th to endNight
9%317%40%25%3
540
October1st to 15thNight
14%428%30%19%3
720
16th to endNight
13%8%34%30%12%
768
November1st to 15thNight
14%10%36%27%11%
760
16th to endNight
18%11%37%23%8%
973
December1st to 15thNight
21%12%33%26%5%
910
16th to endNight
18%11%39%25%3
960
Page generated at 2017-12-03 10:16:49. Version ac04

Copyright 2017 A. Danko


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