Morris
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Morris clear sky chart from 2005-11-06 to 2024-02-05.

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
37%
25160
13%
80728
8%
25078
42%
25078
20%
55831

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
31%
938
8%
4710
7%
926
36%
926
9%
3385
January11th to 20thNight
27%
940
6%
4683
5%
930
31%
930
7%
3843
January21st to endNight
26%
1036
7%
4834
5%
1023
30%
1023
8%
3717
February1st to 10thNight
35%
923
12%
2473
6%
923
39%
923
18%
1865
February11th to 20thNight
39%
875
15%
2274
7%
874
43%
874
23%
1604
February21st to endNight
35%
668
18%
1852
8%
668
42%
668
21%
1347
March1st to 10thNight
36%
680
14%
2122
10%
680
40%
680
18%
1525
March11th to 20thNight
37%
540
20%
1980
15%
540
47%
540
22%
1227
March21st to endNight
39%
594
15%
2178
14%
594
45%
594
18%
1440
April1st to 10thNight
39%
540
18%
1773
15%
540
49%
540
25%
1102
April11th to 20thNight
35%
533
18%
1599
14%
533
43%
533
22%
1088
April21st to endNight
40%
540
15%
1620
11%
540
44%
540
24%
1076
May1st to 10thNight
36%
540
15%
1575
5%
540
41%
540
26%
1022
May11th to 20thNight
41%
531
16%
1305
6%
531
44%
531
30%
896
May21st to endNight
37%
584
12%
1358
4%
582
41%
582
32%
933
June1st to 10thNight
47%
540
8%
1260
4%
540
51%
540
36%
837
June11th to 20thNight
43%
540
7%
1260
4%
540
46%
540
36%
829
June21st to endNight
54%
540
7%
1260
5%
540
57%
540
37%
833
July1st to 10thNight
61%
525
10%
1225
6%
525
64%
525
50%
734
July11th to 20thNight
56%
522
13%
1218
6%
522
59%
522
46%
737
July21st to endNight
63%
591
19%
1360
8%
558
65%
558
51%
781
August1st to 10thNight
59%
537
18%
1513
8%
534
63%
534
42%
843
August11th to 20thNight
60%
534
19%
1600
13%
534
65%
534
38%
895
August21st to endNight
55%
594
23%
1782
21%
594
62%
594
38%
983
September1st to 10thNight
51%
540
21%
1736
19%
540
59%
540
39%
937
September11th to 20thNight
48%
540
18%
1980
17%
540
55%
540
30%
1093
September21st to endNight
40%
540
20%
1980
16%
540
49%
540
24%
1183
October1st to 10thNight
30%
656
16%
2096
10%
656
37%
656
20%
1403
October11th to 20thNight
33%
751
21%
2191
11%
751
39%
751
23%
1465
October21st to endNight
32%
990
14%
2574
5%
990
37%
990
21%
1850
November1st to 10thNight
27%
925
13%
2541
4%
925
34%
925
19%
1868
November11th to 20thNight
26%
950
11%
2660
5%
950
31%
950
16%
2024
November21st to endNight
21%
950
10%
2759
3%
950
27%
950
15%
2092
December1st to 10thNight
30%
950
8%
2850
5%
950
34%
950
14%
2180
December11th to 20thNight
20%
949
9%
3459
4%
949
25%
949
10%
2640
December21st to endNight
21%
1034
7%
5088
6%
1026
27%
1026
8%
3554

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%9%47%7%45%5%6%7%35%
77739
Night
10%10%48%7%45%5%5%7%34%
81163
TransparencyDay
48%415%24%8%1
77425
Night
50%414%22%9%1
81010
SeeingDay
15%7%29%30%15%4
15097
Night
15%6%30%34%13%1
25209

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 10thDay
7%16%6%10%9%5%6%7%6%6%23%
2218
11th to 20thDay
49%6%16%15%8%11%9%7%5%11%
2265
21st to endDay
10%15%7%15%8%46%6%6%6%18%
2794
February1st to 10thDay
9%10%6%11%11%5%8%7%6%7%22%
1581
11th to 20thDay
8%9%5%9%9%6%8%7%7%8%25%
1574
21st to endDay
7%8%5%12%11%5%7%7%6%8%25%
1421
March1st to 10thDay
12%12%6%9%10%46%5%6%6%25%
1834
11th to 20thDay
7%10%5%10%8%47%6%6%7%29%
1980
21st to endDay
12%12%5%9%8%45%5%6%7%28%
2178
April1st to 10thDay
10%11%6%8%6%45%5%47%34%
2185
11th to 20thDay
13%10%47%7%35%6%6%7%34%
2312
21st to endDay
18%8%5%7%6%3445%6%34%
2340
May1st to 10thDay
16%8%45%5%4445%6%39%
2384
11th to 20thDay
17%7%345%345%6%8%39%
2587
21st to endDay
18%7%25%5%3445%7%39%
2918
June1st to 10thDay
13%7%35%5%35%5%7%9%38%
2700
11th to 20thDay
15%6%36%6%45%5%7%8%38%
2700
21st to endDay
12%5%26%6%46%6%7%9%37%
2700
July1st to 10thDay
7%3245%35%5%8%10%49%
2700
11th to 20thDay
10%5%25%6%35%5%6%9%45%
2700
21st to endDay
6%3244345%6%8%55%
2876
August1st to 10thDay
8%5%245%35%5%6%8%48%
2416
11th to 20thDay
10%424335%5%5%10%49%
2301
21st to endDay
12%5%245%2445%7%49%
2574
September1st to 10thDay
10%6%2443446%7%51%
2223
11th to 20thDay
13%6%25%5%345%6%8%42%
1980
21st to endDay
16%6%25%42446%8%41%
1980
October1st to 10thDay
18%10%35%5%345%5%7%37%
1846
11th to 20thDay
15%10%37%6%345%5%7%35%
1764
21st to endDay
16%12%48%6%445%5%7%28%
1782
November1st to 10thDay
16%14%47%6%345%5%7%30%
1537
11th to 20thDay
10%13%7%14%7%3445%6%26%
1520
21st to endDay
13%14%6%9%9%45%5%45%27%
1418
December1st to 10thDay
9%13%7%12%10%47%7%5%6%21%
1330
11th to 20thDay
10%15%6%13%9%46%5%6%7%18%
1679
21st to endDay
10%12%6%11%9%6%7%5%7%6%22%
2442
January1st to 10thNight
5%13%7%11%8%7%7%6%6%7%22%
4737
11th to 20thNight
5%12%6%13%13%8%10%7%5%5%15%
4704
21st to endNight
9%16%8%13%8%5%5%6%5%5%20%
4873
February1st to 10thNight
8%10%5%9%8%5%8%7%5%6%27%
2473
11th to 20thNight
7%10%38%7%47%6%7%8%33%
2273
21st to endNight
6%10%6%12%7%36%6%6%7%31%
1852
March1st to 10thNight
11%12%5%8%7%35%6%5%7%30%
2111
11th to 20thNight
8%8%48%5%36%46%7%41%
1979
21st to endNight
13%10%47%6%35%5%6%7%35%
2178
April1st to 10thNight
10%8%35%6%36%6%6%8%40%
1773
11th to 20thNight
13%9%5%7%6%45%5%5%6%36%
1599
21st to endNight
13%8%36%5%45%5%5%7%37%
1620
May1st to 10thNight
14%7%35%436%45%6%42%
1575
11th to 20thNight
14%7%47%4245%6%6%41%
1305
21st to endNight
15%8%235%335%6%8%42%
1358
June1st to 10thNight
12%5%246%25%5%6%9%44%
1260
11th to 20thNight
12%425%6%3446%9%44%
1260
21st to endNight
9%4245%35%7%6%10%44%
1260
July1st to 10thNight
6%32342446%9%56%
1260
11th to 20thNight
5%314435%6%8%8%54%
1260
21st to endNight
6%3233245%6%9%58%
1440
August1st to 10thNight
7%325%5%3446%8%54%
1521
11th to 20thNight
9%325%5%345%5%10%51%
1600
21st to endNight
10%5%234235%5%7%55%
1782
September1st to 10thNight
9%4244245%5%8%54%
1736
11th to 20thNight
12%6%2443446%8%48%
1980
21st to endNight
16%6%35%5%3445%8%42%
1980
October1st to 10thNight
18%7%46%5%3445%6%37%
2096
11th to 20thNight
15%9%46%5%245%5%7%38%
2191
21st to endNight
14%10%37%6%45%45%8%33%
2574
November1st to 10thNight
13%13%6%7%6%45%5%5%6%31%
2541
11th to 20thNight
12%13%7%11%7%35%45%6%28%
2660
21st to endNight
12%12%6%10%9%45%446%28%
2759
December1st to 10thNight
8%13%6%11%10%5%7%5%5%6%23%
2850
11th to 20thNight
9%15%6%14%9%45%5%5%5%22%
3518
21st to endNight
10%11%5%10%10%6%5%46%6%25%
5225

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
61%314%18%4
2219
11th to 20thDay
73%311%11%2
2265
21st to endDay
66%49%16%4
2794
February1st to 10thDay
60%5%12%15%8%1
1581
11th to 20thDay
56%414%18%9%
1583
21st to endDay
57%314%18%8%
1421
March1st to 10thDay
60%413%17%6%
1836
11th to 20thDay
53%5%13%21%8%
1980
21st to endDay
54%415%19%7%
2178
April1st to 10thDay
50%411%25%9%1
2185
11th to 20thDay
50%312%22%11%1
2312
21st to endDay
51%315%21%7%2
2340
May1st to 10thDay
47%312%24%13%1
2384
11th to 20thDay
44%411%28%12%1
2591
21st to endDay
45%413%26%11%1
2918
June1st to 10thDay
42%5%18%26%9%1
2700
11th to 20thDay
43%5%16%25%11%1
2700
21st to endDay
42%6%21%26%6%
2700
July1st to 10thDay
29%5%19%35%11%1
2626
11th to 20thDay
36%5%18%30%12%
2619
21st to endDay
28%5%19%35%13%1
2716
August1st to 10thDay
33%5%20%32%10%1
2400
11th to 20thDay
32%5%22%33%8%
2301
21st to endDay
35%317%33%11%
2574
September1st to 10thDay
33%318%34%11%1
2223
11th to 20thDay
40%5%21%27%7%1
1980
21st to endDay
41%416%33%6%
1980
October1st to 10thDay
48%416%24%7%
1846
11th to 20thDay
49%415%24%8%1
1764
21st to endDay
56%5%17%19%4
1782
November1st to 10thDay
54%5%15%20%5%1
1537
11th to 20thDay
60%414%17%5%
1520
21st to endDay
62%415%16%3
1418
December1st to 10thDay
64%414%13%4
1330
11th to 20thDay
64%415%12%5%
1680
21st to endDay
63%410%17%6%
2442
January1st to 10thNight
60%415%17%5%
4737
11th to 20thNight
71%49%13%3
4704
21st to endNight
65%5%11%15%4
4873
February1st to 10thNight
57%412%17%9%
2473
11th to 20thNight
49%417%20%10%1
2274
21st to endNight
52%5%11%22%10%
1852
March1st to 10thNight
54%413%21%8%
2122
11th to 20thNight
44%414%27%11%1
1980
21st to endNight
50%414%20%11%1
2178
April1st to 10thNight
41%313%25%15%3
1773
11th to 20thNight
50%39%22%15%2
1599
21st to endNight
47%312%26%11%2
1620
May1st to 10thNight
43%411%26%16%1
1575
11th to 20thNight
43%411%26%14%3
1306
21st to endNight
41%5%13%23%18%1
1358
June1st to 10thNight
37%5%18%27%12%2
1260
11th to 20thNight
37%5%17%27%13%2
1260
21st to endNight
34%6%21%30%8%1
1260
July1st to 10thNight
25%5%18%37%13%2
1225
11th to 20thNight
26%5%20%32%17%1
1218
21st to endNight
24%415%39%17%2
1360
August1st to 10thNight
28%419%35%13%2
1513
11th to 20thNight
29%5%23%31%13%1
1600
21st to endNight
29%415%35%16%1
1782
September1st to 10thNight
28%415%35%16%1
1736
11th to 20thNight
34%419%30%11%1
1980
21st to endNight
41%414%30%10%1
1980
October1st to 10thNight
49%316%23%8%1
2096
11th to 20thNight
46%412%29%9%
2191
21st to endNight
51%414%25%5%
2574
November1st to 10thNight
54%415%19%7%1
2541
11th to 20thNight
58%415%16%6%1
2660
21st to endNight
59%415%16%6%
2759
December1st to 10thNight
61%416%14%5%
2850
11th to 20thNight
64%314%13%6%
3516
21st to endNight
60%312%18%7%
5225

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
10%7%31%33%17%3
270
11th to 20thDay
12%7%29%34%15%3
270
21st to endDay
15%430%33%14%3
297
February1st to 10thDay
13%8%36%34%8%2
252
11th to 20thDay
12%12%33%31%10%2
240
21st to endDay
9%5%42%29%14%1
198
March1st to 10thDay
12%5%35%33%13%3
240
11th to 20thDay
10%8%32%30%15%5%
240
21st to endDay
15%6%30%34%12%4
264
April1st to 10thDay
16%11%30%31%10%2
445
11th to 20thDay
19%8%31%26%13%2
590
21st to endDay
20%10%30%26%12%3
600
May1st to 10thDay
17%11%30%27%13%2
603
11th to 20thDay
20%8%27%27%13%5%
625
21st to endDay
19%7%25%30%15%4
679
June1st to 10thDay
14%7%29%26%16%8%
630
11th to 20thDay
17%8%30%30%12%4
630
21st to endDay
13%5%25%33%19%6%
630
July1st to 10thDay
10%327%31%21%8%
621
11th to 20thDay
13%6%26%29%20%5%
618
21st to endDay
5%5%25%33%22%9%
684
August1st to 10thDay
8%423%34%22%9%
626
11th to 20thDay
12%321%33%20%10%
615
21st to endDay
14%6%25%29%20%6%
693
September1st to 10thDay
11%7%36%29%15%3
513
11th to 20thDay
16%8%36%25%12%3
270
21st to endDay
24%6%34%24%11%1
270
October1st to 10thDay
24%9%25%27%14%2
270
11th to 20thDay
14%7%36%30%11%1
270
21st to endDay
27%10%31%21%10%1
297
November1st to 10thDay
26%6%27%29%10%1
270
11th to 20thDay
19%10%35%26%9%2
270
21st to endDay
18%10%38%25%8%
270
December1st to 10thDay
15%6%36%31%10%2
270
11th to 20thDay
16%10%35%31%8%
270
21st to endDay
17%430%32%13%4
297
January1st to 10thNight
12%7%32%32%14%3
950
11th to 20thNight
16%6%32%33%13%
950
21st to endNight
14%7%34%33%11%1
1045
February1st to 10thNight
13%5%30%36%13%2
923
11th to 20thNight
13%6%29%36%14%3
879
21st to endNight
11%7%32%35%13%2
668
March1st to 10thNight
16%6%30%32%14%2
682
11th to 20thNight
10%6%37%32%14%1
540
21st to endNight
19%5%26%31%16%3
594
April1st to 10thNight
14%8%32%34%11%1
540
11th to 20thNight
18%6%29%35%12%1
533
21st to endNight
17%7%29%36%11%1
540
May1st to 10thNight
16%7%32%33%12%
540
11th to 20thNight
17%6%28%33%15%1
531
21st to endNight
19%332%34%10%1
584
June1st to 10thNight
14%427%36%17%1
540
11th to 20thNight
15%5%30%35%15%1
540
21st to endNight
11%422%40%21%1
540
July1st to 10thNight
8%224%45%21%1
525
11th to 20thNight
6%427%43%19%1
522
21st to endNight
8%222%45%20%3
591
August1st to 10thNight
9%221%46%20%1
537
11th to 20thNight
10%320%41%22%4
534
21st to endNight
11%325%38%22%1
594
September1st to 10thNight
10%231%38%17%2
540
11th to 20thNight
14%328%40%14%1
540
21st to endNight
19%331%34%12%1
540
October1st to 10thNight
22%7%32%28%10%1
656
11th to 20thNight
23%6%30%30%11%
751
21st to endNight
19%8%30%32%9%1
990
November1st to 10thNight
20%9%32%29%9%1
925
11th to 20thNight
18%7%34%30%9%3
950
21st to endNight
18%9%39%26%7%1
950
December1st to 10thNight
14%7%30%33%14%2
950
11th to 20thNight
18%6%32%33%9%2
950
21st to endNight
20%6%32%28%12%1
1045
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