Murfreesboro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Murfreesboro clear sky chart from 2005-11-06 to 2024-03-18.

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
44%
23747
21%
79566
15%
23637
51%
23637
24%
50375

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
23%
755
19%
4027
11%
737
35%
737
12%
2511
January11th to 20thNight
19%
759
20%
3992
8%
740
29%
740
8%
2647
January21st to endNight
22%
833
15%
4196
10%
814
35%
814
12%
2814
February1st to 10thNight
23%
760
18%
2280
9%
760
31%
760
19%
1608
February11th to 20thNight
21%
743
17%
2219
7%
740
29%
740
17%
1571
February21st to endNight
17%
628
17%
1884
8%
628
25%
628
17%
1344
March1st to 10thNight
26%
760
18%
2280
9%
760
33%
760
21%
1529
March11th to 20thNight
26%
752
18%
2139
9%
752
33%
752
20%
1510
March21st to endNight
32%
720
19%
2106
11%
720
39%
720
24%
1399
April1st to 10thNight
38%
540
25%
1800
16%
540
51%
540
29%
1030
April11th to 20thNight
39%
533
27%
1775
17%
533
53%
533
29%
1034
April21st to endNight
41%
540
23%
1746
14%
540
50%
540
27%
1056
May1st to 10thNight
44%
540
22%
1620
13%
540
52%
540
31%
1008
May11th to 20thNight
51%
531
17%
1593
13%
531
54%
531
26%
1029
May21st to endNight
65%
582
17%
1744
13%
582
67%
582
29%
1093
June1st to 10thNight
63%
540
19%
1620
14%
540
66%
540
31%
1002
June11th to 20thNight
75%
540
23%
1527
18%
540
77%
540
45%
840
June21st to endNight
70%
540
21%
1440
15%
540
72%
540
37%
889
July1st to 10thNight
67%
525
15%
1400
13%
525
68%
525
30%
926
July11th to 20thNight
70%
522
18%
1523
17%
522
71%
522
33%
934
July21st to endNight
72%
591
18%
1672
17%
558
73%
558
30%
1055
August1st to 10thNight
75%
537
19%
1682
21%
534
76%
534
30%
1017
August11th to 20thNight
70%
534
17%
1776
19%
534
71%
534
29%
1076
August21st to endNight
71%
594
21%
1980
25%
594
71%
594
29%
1192
September1st to 10thNight
66%
566
23%
1826
23%
566
68%
566
30%
1109
September11th to 20thNight
61%
720
24%
1980
19%
720
64%
720
32%
1273
September21st to endNight
64%
720
29%
1980
22%
720
67%
720
38%
1173
October1st to 10thNight
60%
720
32%
1980
25%
720
65%
720
42%
1120
October11th to 20thNight
45%
720
29%
1982
19%
720
53%
720
31%
1246
October21st to endNight
42%
792
28%
2574
23%
792
52%
792
29%
1522
November1st to 10thNight
51%
740
27%
2406
26%
740
57%
740
31%
1357
November11th to 20thNight
38%
760
28%
2470
20%
760
51%
760
31%
1402
November21st to endNight
36%
760
24%
2470
17%
760
46%
760
25%
1537
December1st to 10thNight
27%
760
18%
2470
11%
760
36%
760
18%
1708
December11th to 20thNight
31%
759
23%
2951
15%
758
43%
758
19%
1816
December21st to endNight
24%
831
12%
4456
10%
817
34%
817
10%
2998

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%6%35%5%5%7%39%
79571
Night
14%7%35%5%3445%7%42%
80209
TransparencyDay
43%7%11%20%16%3
79287
Night
41%6%11%21%18%4
80013
SeeingDay
17%11%23%23%18%8%
14093
Night
17%9%24%29%18%3
23764

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
14%11%5%9%7%45%6%5%5%28%
2836
11th to 20thDay
21%9%311%6%46%33430%
2840
21st to endDay
25%10%7%5%423345%30%
3389
February1st to 10thDay
19%11%47%6%24345%35%
1900
11th to 20thDay
20%12%46%5%34345%33%
1848
21st to endDay
21%9%45%5%25%345%35%
1570
March1st to 10thDay
15%9%36%6%245%46%39%
1900
11th to 20thDay
19%8%36%6%35%5%45%34%
1985
21st to endDay
16%8%46%6%35%6%6%6%34%
2263
April1st to 10thDay
12%6%35%4345%6%6%46%
2160
11th to 20thDay
14%7%25%5%3445%7%45%
2134
21st to endDay
12%7%26%6%36%45%7%40%
2213
May1st to 10thDay
15%5%35%5%35%5%5%8%43%
2340
11th to 20thDay
14%6%45%6%45%5%5%7%38%
2301
21st to endDay
9%6%36%6%46%6%6%8%41%
2531
June1st to 10thDay
8%6%36%6%45%6%7%9%41%
2340
11th to 20thDay
5%4246%46%7%7%10%46%
2424
21st to endDay
5%426%6%46%7%7%12%41%
2520
July1st to 10thDay
8%6%37%7%5%8%8%7%9%33%
2520
11th to 20thDay
9%5%26%7%47%6%7%10%36%
2381
21st to endDay
7%5%35%7%5%8%8%8%10%35%
2547
August1st to 10thDay
6%6%26%8%5%8%7%9%10%35%
2240
11th to 20thDay
9%6%36%6%47%7%7%9%36%
2125
21st to endDay
10%6%35%6%5%6%7%8%8%37%
2376
September1st to 10thDay
12%5%36%7%46%6%6%7%39%
2114
11th to 20thDay
13%6%26%6%36%6%5%6%42%
1980
21st to endDay
10%5%35%5%3445%7%50%
1980
October1st to 10thDay
11%5%24434446%54%
1980
11th to 20thDay
12%5%24433446%53%
1973
21st to endDay
16%6%25%5%3445%6%45%
1782
November1st to 10thDay
13%422323446%58%
1672
11th to 20thDay
14%6%245%2345%7%49%
1710
21st to endDay
15%7%36%3345%5%5%44%
1710
December1st to 10thDay
20%10%46%5%3345%5%34%
1710
11th to 20thDay
16%9%47%6%35%5%45%36%
2153
21st to endDay
17%11%46%6%35%45%8%30%
3124
January1st to 10thNight
17%11%46%5%24446%37%
4109
11th to 20thNight
20%9%47%6%3443435%
4120
21st to endNight
21%13%46%423345%35%
4263
February1st to 10thNight
20%10%46%5%3435%6%35%
2280
11th to 20thNight
22%9%45%6%3434436%
2218
21st to endNight
23%9%35%6%3445%5%33%
1884
March1st to 10thNight
17%8%26%5%35%45%7%39%
2280
11th to 20thNight
17%9%36%5%345%5%6%38%
2139
21st to endNight
15%8%26%435%5%6%7%40%
2106
April1st to 10thNight
12%425%43446%8%49%
1800
11th to 20thNight
15%6%2342345%7%49%
1775
21st to endNight
13%5%25%5%25%5%5%7%45%
1746
May1st to 10thNight
11%6%25%5%3445%7%48%
1620
11th to 20thNight
11%5%345%35%5%6%9%43%
1592
21st to endNight
6%435%6%46%6%7%10%43%
1744
June1st to 10thNight
6%5%36%6%45%46%9%45%
1620
11th to 20thNight
4215%4345%7%10%55%
1527
21st to endNight
5%425%5%25%6%6%12%48%
1440
July1st to 10thNight
10%5%35%6%35%6%7%11%39%
1440
11th to 20thNight
7%436%6%35%5%7%13%43%
1574
21st to endNight
6%425%6%46%7%8%12%40%
1771
August1st to 10thNight
6%5%25%5%46%5%7%12%44%
1693
11th to 20thNight
7%5%25%5%46%5%7%10%44%
1776
21st to endNight
8%5%25%435%5%7%11%44%
1980
September1st to 10thNight
10%5%35%5%345%5%8%47%
1826
11th to 20thNight
11%5%36%5%44448%45%
1980
21st to endNight
9%5%2443445%7%53%
1980
October1st to 10thNight
10%413323446%59%
1980
11th to 20thNight
15%5%34434346%49%
1982
21st to endNight
16%6%24423446%48%
2574
November1st to 10thNight
12%5%25%5%2434455%
2406
11th to 20thNight
12%6%34423348%50%
2470
21st to endNight
16%7%35%434446%45%
2470
December1st to 10thNight
20%9%45%5%3445%6%34%
2470
11th to 20thNight
17%8%36%5%33345%44%
3042
21st to endNight
16%11%48%7%45%5%5%6%29%
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
56%5%8%18%12%2
2837
11th to 20thDay
58%47%15%15%1
2840
21st to endDay
56%48%20%11%1
3389
February1st to 10thDay
53%5%7%18%15%2
1900
11th to 20thDay
54%47%18%14%3
1858
21st to endDay
52%48%15%16%5%
1570
March1st to 10thDay
47%5%8%16%18%6%
1900
11th to 20thDay
52%6%9%17%14%3
1985
21st to endDay
48%8%10%19%13%1
2263
April1st to 10thDay
36%8%10%24%19%4
2160
11th to 20thDay
39%6%7%21%22%5%
2134
21st to endDay
42%6%9%25%16%2
2213
May1st to 10thDay
40%7%11%25%14%3
2340
11th to 20thDay
44%8%12%22%13%1
2305
21st to endDay
39%10%14%23%13%2
2531
June1st to 10thDay
37%11%12%22%16%2
2340
11th to 20thDay
30%10%17%23%17%3
2424
21st to endDay
34%11%17%19%15%4
2520
July1st to 10thDay
43%12%15%16%11%3
2451
11th to 20thDay
40%10%18%17%11%4
2309
21st to endDay
38%12%17%22%9%1
2405
August1st to 10thDay
39%12%17%20%11%1
2227
11th to 20thDay
41%11%12%19%14%2
2125
21st to endDay
42%10%14%19%12%3
2376
September1st to 10thDay
41%9%12%18%16%3
2114
11th to 20thDay
40%8%10%22%17%3
1980
21st to endDay
34%6%11%22%21%6%
1980
October1st to 10thDay
31%7%8%22%27%6%
1980
11th to 20thDay
33%49%21%25%8%
1973
21st to endDay
40%5%7%19%24%5%
1782
November1st to 10thDay
29%5%9%22%29%5%
1672
11th to 20thDay
36%46%23%25%6%
1710
21st to endDay
41%5%6%23%20%4
1710
December1st to 10thDay
52%5%6%21%14%3
1710
11th to 20thDay
50%5%10%18%16%2
2150
21st to endDay
52%6%11%19%9%2
3124
January1st to 10thNight
48%48%22%16%2
4109
11th to 20thNight
51%6%7%15%16%5%
4120
21st to endNight
53%48%20%14%2
4263
February1st to 10thNight
51%410%17%16%1
2280
11th to 20thNight
54%37%17%15%5%
2219
21st to endNight
52%5%8%14%15%5%
1884
March1st to 10thNight
45%5%9%14%19%7%
2280
11th to 20thNight
48%6%8%20%15%3
2139
21st to endNight
44%5%11%24%14%2
2106
April1st to 10thNight
33%6%13%24%22%3
1800
11th to 20thNight
35%5%9%20%23%8%
1775
21st to endNight
37%6%10%26%18%2
1746
May1st to 10thNight
37%5%10%26%19%2
1620
11th to 20thNight
36%10%16%21%15%1
1593
21st to endNight
33%11%16%23%15%2
1745
June1st to 10thNight
36%7%12%27%16%3
1620
11th to 20thNight
22%8%19%32%16%3
1527
21st to endNight
28%10%17%26%14%4
1440
July1st to 10thNight
35%11%18%20%14%3
1400
11th to 20thNight
31%9%18%24%12%5%
1523
21st to endNight
32%12%18%24%13%1
1672
August1st to 10thNight
32%10%17%27%14%1
1682
11th to 20thNight
34%9%19%21%15%2
1776
21st to endNight
33%9%15%25%14%4
1980
September1st to 10thNight
34%8%13%23%18%5%
1826
11th to 20thNight
38%6%12%18%24%2
1980
21st to endNight
30%6%10%23%24%7%
1980
October1st to 10thNight
26%6%9%22%28%9%
1980
11th to 20thNight
37%5%8%20%22%8%
1982
21st to endNight
37%46%21%26%6%
2574
November1st to 10thNight
33%48%21%26%7%
2406
11th to 20thNight
34%48%20%27%8%
2470
21st to endNight
41%47%23%20%5%
2470
December1st to 10thNight
50%5%9%18%15%3
2470
11th to 20thNight
43%47%20%22%3
3044
21st to endNight
54%5%10%17%13%1
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
24%24%34%11%6%
270
11th to 20thDay
30%28%26%11%31
270
21st to endDay
26%25%36%10%3
297
February1st to 10thDay
32%20%33%13%21
270
11th to 20thDay
37%24%29%8%11
270
21st to endDay
38%25%26%9%1
225
March1st to 10thDay
26%21%36%14%4
270
11th to 20thDay
25%20%31%16%7%
376
21st to endDay
27%17%31%17%8%
462
April1st to 10thDay
19%17%28%24%10%1
420
11th to 20thDay
18%15%30%24%10%2
412
21st to endDay
20%17%28%21%11%3
420
May1st to 10thDay
18%13%28%24%13%4
423
11th to 20thDay
15%10%26%26%15%8%
447
21st to endDay
13%5%18%29%20%14%
485
June1st to 10thDay
10%7%20%23%26%15%
450
11th to 20thDay
4417%29%28%16%
534
21st to endDay
5%422%31%23%14%
630
July1st to 10thDay
9%412%30%26%20%
621
11th to 20thDay
9%412%23%32%21%
482
21st to endDay
7%312%29%31%19%
488
August1st to 10thDay
11%312%26%32%16%
446
11th to 20thDay
10%312%31%33%11%
439
21st to endDay
14%29%24%34%17%
495
September1st to 10thDay
12%212%27%32%14%
450
11th to 20thDay
12%6%11%25%30%16%
450
21st to endDay
13%6%15%31%26%8%
450
October1st to 10thDay
12%5%22%27%26%8%
450
11th to 20thDay
15%14%29%26%15%3
447
21st to endDay
25%15%26%24%8%2
297
November1st to 10thDay
18%9%32%28%10%3
270
11th to 20thDay
16%14%40%26%5%
270
21st to endDay
19%21%28%17%12%2
270
December1st to 10thDay
29%20%29%18%3
270
11th to 20thDay
22%22%30%16%10%1
270
21st to endDay
24%26%31%16%3
297
January1st to 10thNight
24%17%32%23%4
760
11th to 20thNight
27%21%30%19%4
760
21st to endNight
22%16%37%23%3
836
February1st to 10thNight
25%14%34%23%4
760
11th to 20thNight
30%15%31%21%2
743
21st to endNight
31%17%33%18%2
628
March1st to 10thNight
22%16%33%25%5%
760
11th to 20thNight
22%16%33%21%7%1
752
21st to endNight
19%14%31%27%8%
720
April1st to 10thNight
14%12%35%30%9%
540
11th to 20thNight
18%10%31%30%10%1
533
21st to endNight
16%9%31%31%11%2
540
May1st to 10thNight
13%7%33%29%18%1
540
11th to 20thNight
12%5%24%34%19%5%
531
21st to endNight
7%118%39%29%6%
584
June1st to 10thNight
7%317%35%32%5%
540
11th to 20thNight
4112%40%34%8%
540
21st to endNight
4115%37%35%8%
540
July1st to 10thNight
10%210%30%39%9%
525
11th to 20thNight
6%310%28%43%10%
522
21st to endNight
7%110%31%41%10%
591
August1st to 10thNight
8%2431%45%9%
537
11th to 20thNight
8%39%36%39%4
534
21st to endNight
9%28%31%41%9%
594
September1st to 10thNight
10%311%30%39%7%
566
11th to 20thNight
12%414%29%36%5%
720
21st to endNight
12%216%32%35%3
720
October1st to 10thNight
11%6%17%31%30%6%
720
11th to 20thNight
19%7%24%33%16%1
720
21st to endNight
19%9%26%30%14%2
792
November1st to 10thNight
15%7%21%37%18%2
740
11th to 20thNight
15%12%33%28%12%1
760
21st to endNight
19%12%29%28%11%1
760
December1st to 10thNight
26%13%31%25%5%
760
11th to 20thNight
23%12%30%29%7%1
760
21st to endNight
26%16%29%24%5%
836
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