Crawfordville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Crawfordville clear sky chart from 2005-11-06 to 2024-02-10.

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
55%
24047
22%
79420
16%
23941
61%
23941
27%
48040

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 10thNight
30%
755
22%
3989
10%
737
45%
737
15%
2298
January11th to 20thNight
41%
753
26%
3938
18%
740
54%
740
18%
2258
January21st to endNight
29%
834
17%
4098
11%
814
43%
814
15%
2503
February1st to 10thNight
38%
759
24%
2275
14%
759
48%
759
27%
1424
February11th to 20thNight
37%
701
22%
2098
10%
699
48%
699
27%
1308
February21st to endNight
35%
592
24%
1776
13%
592
45%
592
25%
1149
March1st to 10thNight
45%
720
29%
2085
17%
720
54%
720
35%
1222
March11th to 20thNight
46%
720
26%
1980
15%
720
54%
720
34%
1197
March21st to endNight
47%
792
28%
2178
15%
792
56%
792
37%
1267
April1st to 10thNight
49%
720
24%
1980
15%
720
55%
720
34%
1203
April11th to 20thNight
48%
566
24%
1808
20%
566
56%
566
31%
1064
April21st to endNight
59%
540
32%
1751
26%
540
68%
540
41%
893
May1st to 10thNight
63%
540
29%
1620
21%
540
70%
540
47%
829
May11th to 20thNight
66%
531
21%
1592
17%
531
69%
531
37%
915
May21st to endNight
74%
582
24%
1744
21%
582
75%
582
38%
996
June1st to 10thNight
71%
540
15%
1620
15%
540
71%
540
30%
1013
June11th to 20thNight
75%
540
15%
1620
12%
540
77%
540
33%
984
June21st to endNight
75%
540
14%
1620
12%
540
77%
540
29%
1048
July1st to 10thNight
75%
525
9%
1575
9%
525
75%
525
26%
1040
July11th to 20thNight
77%
522
10%
1566
10%
522
77%
522
25%
1056
July21st to endNight
83%
591
13%
1672
14%
558
84%
558
33%
1020
August1st to 10thNight
78%
537
10%
1740
12%
534
78%
534
28%
1089
August11th to 20thNight
78%
534
8%
1776
10%
534
78%
534
23%
1175
August21st to endNight
67%
609
12%
1995
14%
609
68%
609
19%
1395
September1st to 10thNight
67%
720
12%
1980
12%
720
68%
720
22%
1417
September11th to 20thNight
65%
720
13%
1980
11%
720
66%
720
22%
1399
September21st to endNight
65%
720
25%
1980
21%
720
69%
720
34%
1243
October1st to 10thNight
55%
720
26%
1980
20%
720
61%
720
35%
1214
October11th to 20thNight
62%
720
37%
2016
30%
720
70%
720
44%
1096
October21st to endNight
57%
792
28%
2376
25%
792
64%
792
35%
1365
November1st to 10thNight
55%
740
29%
2267
24%
740
65%
740
36%
1265
November11th to 20thNight
47%
760
28%
2470
22%
760
58%
760
33%
1374
November21st to endNight
46%
760
26%
2470
20%
760
56%
760
30%
1449
December1st to 10thNight
43%
760
26%
2470
19%
760
55%
760
28%
1471
December11th to 20thNight
42%
760
24%
2923
18%
758
51%
758
22%
1701
December21st to endNight
37%
832
17%
4412
17%
817
47%
817
14%
2700

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
11%5%26%6%45%5%6%8%41%
78763
Night
10%5%25%5%35%5%6%9%46%
80208
TransparencyDay
37%8%14%18%16%7%
78486
Night
35%7%13%18%18%9%
80004
SeeingDay
11%7%22%27%22%11%
13977
Night
11%6%21%31%25%6%
24069

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 10thDay
15%6%25%5%33446%47%
2836
11th to 20thDay
14%5%245%3446%9%45%
2881
21st to endDay
20%6%25%43445%7%40%
3476
February1st to 10thDay
17%6%25%5%34446%43%
1890
11th to 20thDay
15%5%3442445%6%49%
1748
21st to endDay
16%6%24434347%46%
1480
March1st to 10thDay
9%41443445%8%54%
1872
11th to 20thDay
10%5%25%5%345%47%50%
1980
21st to endDay
10%5%2443345%6%54%
2178
April1st to 10thDay
10%4245%45%5%6%8%48%
1980
11th to 20thDay
12%5%25%43445%6%49%
2113
21st to endDay
7%31343445%8%57%
2207
May1st to 10thDay
7%31442445%8%57%
2340
11th to 20thDay
7%5%25%6%46%6%8%10%41%
2301
21st to endDay
6%426%6%5%5%6%8%10%43%
2531
June1st to 10thDay
9%6%38%8%5%7%8%9%11%28%
2340
11th to 20thDay
6%436%7%5%8%9%9%12%30%
2340
21st to endDay
8%5%37%8%5%9%10%9%10%27%
2340
July1st to 10thDay
9%6%47%9%5%8%9%9%12%24%
2340
11th to 20thDay
9%6%38%9%5%9%7%10%12%23%
2340
21st to endDay
6%5%36%9%5%10%9%10%11%27%
2547
August1st to 10thDay
8%5%39%9%6%8%8%8%10%25%
2182
11th to 20thDay
11%7%49%8%5%7%8%9%10%22%
2125
21st to endDay
10%7%38%8%6%8%8%9%9%24%
2340
September1st to 10thDay
9%7%37%9%5%7%8%8%11%26%
1980
11th to 20thDay
9%6%26%7%5%7%8%7%9%32%
1980
21st to endDay
12%5%345%45%47%8%44%
1980
October1st to 10thDay
10%5%35%5%35%5%5%6%48%
1980
11th to 20thDay
7%313424448%60%
1942
21st to endDay
9%5%245%3445%6%54%
1980
November1st to 10thDay
8%41442345%6%59%
1807
11th to 20thDay
10%414423346%57%
1710
21st to endDay
12%426%5%345%5%6%49%
1710
December1st to 10thDay
14%5%35%5%3445%7%44%
1710
11th to 20thDay
16%7%35%5%3435%6%44%
2153
21st to endDay
20%8%35%433335%43%
3124
January1st to 10thNight
16%8%35%43445%6%42%
4109
11th to 20thNight
10%7%36%5%35%5%5%8%43%
4076
21st to endNight
19%10%35%423447%39%
4180
February1st to 10thNight
16%6%35%5%2345%6%45%
2275
11th to 20thNight
15%6%25%423336%50%
2098
21st to endNight
15%7%35%424446%44%
1776
March1st to 10thNight
11%6%2342445%8%51%
2085
11th to 20thNight
12%6%2443346%8%49%
1980
21st to endNight
10%424424448%54%
2178
April1st to 10thNight
10%4343346%6%7%50%
1980
11th to 20thNight
9%5%25%6%345%5%7%49%
1808
21st to endNight
5%42333446%8%59%
1751
May1st to 10thNight
6%31342345%10%60%
1620
11th to 20thNight
4415%435%5%7%10%51%
1592
21st to endNight
5%3145%35%6%6%10%51%
1744
June1st to 10thNight
6%6%36%445%6%8%11%42%
1620
11th to 20thNight
5%325%5%35%6%9%14%43%
1620
21st to endNight
7%325%6%46%6%8%12%41%
1620
July1st to 10thNight
6%435%6%46%9%8%13%37%
1620
11th to 20thNight
4425%7%36%10%9%14%36%
1620
21st to endNight
33245%36%7%9%14%44%
1771
August1st to 10thNight
5%4246%46%6%10%14%39%
1751
11th to 20thNight
6%4246%38%7%10%17%34%
1776
21st to endNight
7%6%36%6%5%7%8%9%10%34%
1995
September1st to 10thNight
7%6%27%7%47%8%9%14%29%
1980
11th to 20thNight
9%5%25%6%47%7%8%10%35%
1980
21st to endNight
8%4245%36%5%7%10%47%
1980
October1st to 10thNight
7%437%5%35%5%48%51%
1980
11th to 20thNight
7%42442435%7%60%
2016
21st to endNight
7%4245%35%6%5%6%52%
2376
November1st to 10thNight
7%4244345%5%7%55%
2267
11th to 20thNight
10%5%24434346%55%
2470
21st to endNight
13%6%25%424446%50%
2470
December1st to 10thNight
13%6%245%25%46%8%47%
2470
11th to 20thNight
16%6%24424447%47%
3042
21st to endNight
19%7%36%5%3345%6%40%
4532

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 10thDay
39%5%7%16%20%13%
2837
11th to 20thDay
36%5%8%16%17%17%
2881
21st to endDay
44%47%14%21%10%
3476
February1st to 10thDay
43%5%8%15%18%11%
1890
11th to 20thDay
37%5%6%16%24%13%
1758
21st to endDay
40%5%9%16%19%11%
1480
March1st to 10thDay
28%6%10%20%27%10%
1872
11th to 20thDay
33%6%15%18%17%11%
1980
21st to endDay
30%5%14%23%18%10%
2178
April1st to 10thDay
33%7%13%18%17%12%
1980
11th to 20thDay
36%48%22%20%10%
2113
21st to endDay
25%5%12%25%22%11%
2207
May1st to 10thDay
24%5%12%24%25%10%
2340
11th to 20thDay
32%10%17%19%17%4
2305
21st to endDay
32%10%14%25%16%3
2531
June1st to 10thDay
43%11%19%20%6%1
2340
11th to 20thDay
37%14%22%19%7%1
2340
21st to endDay
42%15%22%14%5%1
2340
July1st to 10thDay
45%16%25%13%2
2275
11th to 20thDay
46%16%22%13%3
2271
21st to endDay
40%16%26%16%2
2405
August1st to 10thDay
45%15%23%15%2
2169
11th to 20thDay
49%15%22%12%3
2125
21st to endDay
48%15%19%13%41
2340
September1st to 10thDay
44%14%18%14%7%2
1980
11th to 20thDay
42%14%18%15%10%2
1980
21st to endDay
36%8%14%20%15%7%
1980
October1st to 10thDay
35%6%12%17%20%11%
1980
11th to 20thDay
23%6%8%24%29%11%
1942
21st to endDay
31%6%7%15%25%17%
1980
November1st to 10thDay
26%5%10%19%23%17%
1807
11th to 20thDay
30%38%17%28%14%
1710
21st to endDay
35%47%22%23%9%
1710
December1st to 10thDay
39%6%11%17%20%7%
1710
11th to 20thDay
41%5%8%15%20%11%
2150
21st to endDay
46%35%19%20%6%
3124
January1st to 10thNight
43%46%12%20%17%
4109
11th to 20thNight
40%46%14%24%11%
4076
21st to endNight
46%47%14%20%9%
4180
February1st to 10thNight
39%5%7%15%22%12%
2275
11th to 20thNight
39%46%14%20%15%
2099
21st to endNight
42%5%8%16%15%14%
1776
March1st to 10thNight
32%6%9%20%23%12%
2085
11th to 20thNight
33%5%13%21%17%11%
1980
21st to endNight
30%5%11%22%22%10%
2178
April1st to 10thNight
32%6%12%18%19%12%
1980
11th to 20thNight
34%5%8%19%24%9%
1808
21st to endNight
23%6%10%29%22%11%
1751
May1st to 10thNight
22%5%13%23%26%11%
1620
11th to 20thNight
27%9%20%21%19%5%
1593
21st to endNight
26%9%18%22%21%4
1745
June1st to 10thNight
34%10%23%23%10%
1620
11th to 20thNight
29%11%28%22%9%1
1620
21st to endNight
32%13%24%21%8%1
1620
July1st to 10thNight
34%15%30%19%2
1575
11th to 20thNight
33%18%30%16%4
1566
21st to endNight
26%15%35%21%3
1672
August1st to 10thNight
30%15%32%20%3
1740
11th to 20thNight
33%18%31%16%2
1776
21st to endNight
40%16%21%17%5%1
1995
September1st to 10thNight
40%16%20%15%7%2
1980
11th to 20thNight
39%15%18%15%11%1
1980
21st to endNight
32%9%16%20%16%6%
1980
October1st to 10thNight
33%7%12%17%18%13%
1980
11th to 20thNight
24%5%8%22%30%10%
2016
21st to endNight
30%6%9%14%25%17%
2376
November1st to 10thNight
29%6%8%20%20%17%
2267
11th to 20thNight
32%47%17%24%15%
2470
21st to endNight
35%5%9%19%20%12%
2470
December1st to 10thNight
36%5%11%19%21%7%
2470
11th to 20thNight
37%6%7%16%22%12%
3044
21st to endNight
46%5%6%19%20%5%
4532

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 10thDay
16%20%43%16%5%1
270
11th to 20thDay
12%16%36%26%8%3
270
21st to endDay
23%20%42%12%3
297
February1st to 10thDay
20%18%35%19%7%1
267
11th to 20thDay
23%14%33%25%5%
240
21st to endDay
13%15%45%21%6%
198
March1st to 10thDay
9%19%39%26%7%
312
11th to 20thDay
13%17%35%22%11%2
420
21st to endDay
13%16%32%26%12%2
462
April1st to 10thDay
11%15%33%25%14%2
420
11th to 20thDay
11%15%29%30%13%2
412
21st to endDay
7%8%30%32%18%4
420
May1st to 10thDay
6%8%29%33%17%8%
423
11th to 20thDay
8%418%36%23%11%
447
21st to endDay
9%215%31%28%15%
485
June1st to 10thDay
12%212%32%29%14%
450
11th to 20thDay
9%312%27%30%21%
450
21st to endDay
7%17%32%30%23%
450
July1st to 10thDay
8%26%20%31%33%
445
11th to 20thDay
7%15%20%36%30%
444
21st to endDay
7%6%25%36%27%
488
August1st to 10thDay
11%17%18%39%25%
446
11th to 20thDay
10%15%18%36%30%
439
21st to endDay
11%110%24%33%21%
495
September1st to 10thDay
9%210%24%31%24%
450
11th to 20thDay
11%212%30%31%14%
450
21st to endDay
11%212%24%37%14%
450
October1st to 10thDay
10%422%36%22%5%
450
11th to 20thDay
5%6%16%37%30%7%
450
21st to endDay
9%6%25%37%21%2
495
November1st to 10thDay
10%7%26%36%18%4
405
11th to 20thDay
11%11%37%30%9%2
270
21st to endDay
12%11%35%29%11%1
270
December1st to 10thDay
17%13%33%24%9%4
270
11th to 20thDay
19%12%37%26%5%1
270
21st to endDay
21%11%32%22%12%2
297
January1st to 10thNight
19%12%34%25%9%1
760
11th to 20thNight
13%11%28%35%12%1
760
21st to endNight
21%12%33%28%6%
836
February1st to 10thNight
18%9%29%32%11%1
759
11th to 20thNight
19%11%27%34%9%
703
21st to endNight
18%9%32%34%6%
592
March1st to 10thNight
13%8%32%36%12%
720
11th to 20thNight
13%9%28%33%17%
720
21st to endNight
11%10%28%35%15%1
792
April1st to 10thNight
12%7%27%36%18%
720
11th to 20thNight
11%7%27%34%19%2
566
21st to endNight
7%5%25%36%24%2
540
May1st to 10thNight
6%322%39%26%3
540
11th to 20thNight
7%218%38%30%6%
531
21st to endNight
5%110%36%40%8%
584
June1st to 10thNight
9%18%31%42%8%
540
11th to 20thNight
437%31%40%16%
540
21st to endNight
6%26%25%45%16%
540
July1st to 10thNight
5%26%15%46%26%
525
11th to 20thNight
7%412%48%30%
522
21st to endNight
3317%54%23%
591
August1st to 10thNight
6%1316%50%24%
537
11th to 20thNight
5%1414%51%25%
534
21st to endNight
9%17%23%40%20%
609
September1st to 10thNight
8%29%24%41%16%
720
11th to 20thNight
9%211%31%37%10%
720
21st to endNight
9%214%29%38%8%
720
October1st to 10thNight
8%226%31%29%5%
720
11th to 20thNight
7%421%35%30%4
720
21st to endNight
9%5%22%40%22%2
792
November1st to 10thNight
10%5%25%40%19%2
740
11th to 20thNight
12%9%28%34%16%1
760
21st to endNight
15%8%25%36%15%1
760
December1st to 10thNight
16%8%26%31%18%2
760
11th to 20thNight
16%8%28%31%16%
760
21st to endNight
20%9%27%29%13%1
836
Page generated at 2024-02-07 06:11:57. Version ac07

Copyright 2024 Attilla Danko


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