Torrington
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Torrington clear sky chart from 2005-11-06 to 2024-02-25.

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
45%
24869
23%
80004
14%
24788
54%
24788
34%
44705

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
39%
937
27%
4318
13%
926
49%
926
25%
2181
January11th to 20thNight
33%
943
24%
4373
13%
930
44%
930
24%
2270
January21st to endNight
33%
945
16%
4483
10%
933
46%
933
25%
2127
February1st to 10thNight
31%
760
19%
2470
9%
760
43%
760
27%
1505
February11th to 20thNight
34%
740
19%
2247
9%
740
44%
740
29%
1395
February21st to endNight
29%
610
25%
1830
9%
610
44%
610
30%
1097
March1st to 10thNight
36%
720
24%
2160
11%
720
47%
720
34%
1252
March11th to 20thNight
43%
720
23%
2075
13%
720
52%
720
37%
1210
March21st to endNight
36%
616
20%
2002
11%
616
47%
616
27%
1227
April1st to 10thNight
35%
540
21%
1800
13%
540
46%
540
27%
1059
April11th to 20thNight
34%
533
19%
1777
12%
533
46%
533
27%
1064
April21st to endNight
39%
540
19%
1751
14%
540
48%
540
24%
1104
May1st to 10thNight
42%
540
18%
1594
12%
540
48%
540
26%
1034
May11th to 20thNight
49%
531
18%
1418
13%
531
52%
531
32%
920
May21st to endNight
46%
583
17%
1552
11%
582
50%
582
32%
995
June1st to 10thNight
54%
540
15%
1440
8%
540
58%
540
38%
867
June11th to 20thNight
47%
540
20%
1440
9%
540
53%
540
41%
834
June21st to endNight
60%
540
23%
1440
13%
540
65%
540
50%
774
July1st to 10thNight
65%
525
18%
1400
13%
525
68%
525
42%
823
July11th to 20thNight
68%
522
26%
1392
18%
522
71%
522
54%
719
July21st to endNight
69%
591
25%
1488
20%
558
69%
558
46%
824
August1st to 10thNight
66%
537
22%
1477
18%
534
69%
534
40%
848
August11th to 20thNight
69%
534
27%
1761
27%
534
74%
534
46%
864
August21st to endNight
65%
594
29%
1980
29%
594
72%
594
40%
1019
September1st to 10thNight
61%
540
29%
1800
26%
540
69%
540
41%
913
September11th to 20thNight
63%
540
34%
1852
32%
540
71%
540
42%
914
September21st to endNight
54%
540
32%
1980
28%
540
64%
540
39%
967
October1st to 10thNight
50%
656
26%
2096
17%
656
57%
656
36%
1155
October11th to 20thNight
50%
720
31%
2160
18%
720
59%
720
42%
1160
October21st to endNight
45%
935
28%
2519
12%
935
54%
935
41%
1478
November1st to 10thNight
49%
925
27%
2405
14%
925
55%
925
45%
1370
November11th to 20thNight
40%
950
31%
2470
13%
950
52%
950
41%
1444
November21st to endNight
46%
950
28%
2612
14%
950
56%
950
41%
1492
December1st to 10thNight
33%
950
23%
2660
10%
950
44%
950
36%
1565
December11th to 20thNight
38%
948
26%
3072
13%
948
47%
948
37%
1605
December21st to endNight
32%
1034
15%
4710
9%
1026
43%
1026
20%
2630

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
7%5%244345%5%8%53%
78405
Night
7%6%25%4345%5%7%53%
80953
TransparencyDay
29%6%13%27%20%6%
78109
Night
30%6%14%28%18%5%
80771
SeeingDay
9%8%26%31%20%6%
14731
Night
9%7%34%39%11%
24917

By Month

Percentage Cloud Cover SW (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
27%36%6%34447%53%
2538
11th to 20thDay
310%37%7%36%5%6%6%44%
2540
21st to endDay
35%2432345%7%63%
2963
February1st to 10thDay
5%8%5%7%5%35%45%6%46%
1710
11th to 20thDay
5%8%37%435%6%5%8%47%
1819
21st to endDay
5%8%35%5%3345%7%51%
1520
March1st to 10thDay
6%6%35%42446%8%52%
1800
11th to 20thDay
7%5%25%5%246%5%7%51%
1881
21st to endDay
9%6%245%35%5%6%7%48%
2353
April1st to 10thDay
9%6%35%4245%6%8%48%
2160
11th to 20thDay
13%7%25%5%35%5%5%8%41%
2131
21st to endDay
11%7%245%3445%8%46%
2207
May1st to 10thDay
13%6%245%35%45%7%44%
2364
11th to 20thDay
15%6%25%5%36%5%6%9%39%
2478
21st to endDay
11%5%26%5%35%6%6%10%42%
2724
June1st to 10thDay
6%213435%6%7%10%53%
2520
11th to 20thDay
8%314425%5%6%9%52%
2520
21st to endDay
5%2133245%6%9%60%
2520
July1st to 10thDay
5%314435%6%6%10%54%
2520
11th to 20thDay
5%2123235%6%10%61%
2520
21st to endDay
5%324335%6%6%10%53%
2742
August1st to 10thDay
4223435%5%7%10%54%
2450
11th to 20thDay
5%2133245%7%9%60%
2138
21st to endDay
431433445%8%62%
2376
September1st to 10thDay
6%41332335%7%63%
2160
11th to 20thDay
8%21332235%7%63%
2107
21st to endDay
7%41332335%8%62%
1980
October1st to 10thDay
11%42332345%6%57%
1859
11th to 20thDay
8%413325%447%60%
1800
21st to endDay
7%42332346%7%60%
1818
November1st to 10thDay
35%2443446%9%56%
1673
11th to 20thDay
5%42432445%10%58%
1710
21st to endDay
5%6%2432446%6%58%
1564
December1st to 10thDay
5%5%35%325%6%7%8%52%
1520
11th to 20thDay
5%5%234345%5%9%56%
1926
21st to endDay
6%11%36%5%35%447%48%
2794
January1st to 10thNight
36%36%6%345%6%8%50%
4417
11th to 20thNight
36%46%5%35%5%6%8%50%
4430
21st to endNight
45%25%5%35%5%47%55%
4731
February1st to 10thNight
49%36%6%35%5%6%7%46%
2470
11th to 20thNight
6%8%46%6%35%5%6%8%45%
2247
21st to endNight
5%8%36%6%335%6%6%49%
1830
March1st to 10thNight
6%8%35%43345%7%52%
2160
11th to 20thNight
6%7%25%4345%6%8%50%
2075
21st to endNight
9%9%35%5%3445%7%45%
2002
April1st to 10thNight
12%5%344335%5%6%50%
1800
11th to 20thNight
11%7%25%435%45%7%46%
1777
21st to endNight
15%6%25%5%25%6%5%5%43%
1751
May1st to 10thNight
16%6%26%5%35%45%6%43%
1594
11th to 20thNight
16%5%2442346%8%46%
1417
21st to endNight
12%425%4345%6%10%45%
1552
June1st to 10thNight
7%415%4346%7%8%50%
1440
11th to 20thNight
8%324435%46%9%54%
1440
21st to endNight
5%213335%5%7%9%58%
1440
July1st to 10thNight
6%324445%5%7%7%54%
1440
11th to 20thNight
421333445%10%61%
1440
21st to endNight
4314425%5%6%10%56%
1576
August1st to 10thNight
44145%35%5%8%10%51%
1485
11th to 20thNight
32144345%5%9%61%
1761
21st to endNight
43244345%5%7%59%
1980
September1st to 10thNight
8%423423447%60%
1800
11th to 20thNight
7%423323337%63%
1852
21st to endNight
8%42332344462%
1980
October1st to 10thNight
12%423324447%55%
2096
11th to 20thNight
10%323424345%61%
2160
21st to endNight
8%6%23424446%56%
2519
November1st to 10thNight
6%5%2432345%8%56%
2405
11th to 20thNight
5%5%245%345%6%7%55%
2470
21st to endNight
5%7%24323448%57%
2612
December1st to 10thNight
5%6%36%5%35%35%7%53%
2660
11th to 20thNight
45%243245%6%8%57%
3271
21st to endNight
7%10%35%5%35%5%47%47%
4873

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
31%5%14%29%20%
2539
11th to 20thDay
39%7%17%21%15%2
2540
21st to endDay
22%421%34%15%3
2963
February1st to 10thDay
39%5%16%23%15%2
1710
11th to 20thDay
35%7%12%25%17%4
1829
21st to endDay
34%314%26%17%5%
1520
March1st to 10thDay
30%5%12%30%19%4
1800
11th to 20thDay
31%5%14%26%20%4
1881
21st to endDay
34%8%14%30%13%2
2353
April1st to 10thDay
34%7%15%25%14%5%
2160
11th to 20thDay
39%6%13%21%17%4
2134
21st to endDay
36%5%11%28%18%1
2207
May1st to 10thDay
39%6%14%27%12%2
2364
11th to 20thDay
40%8%16%24%10%2
2482
21st to endDay
37%8%17%24%13%2
2724
June1st to 10thDay
25%8%18%28%17%5%
2520
11th to 20thDay
27%6%12%24%22%9%
2520
21st to endDay
20%6%10%26%27%11%
2520
July1st to 10thDay
25%6%11%24%23%10%
2451
11th to 20thDay
19%6%9%25%25%17%
2445
21st to endDay
24%7%12%26%21%10%
2590
August1st to 10thDay
23%6%14%29%18%10%
2434
11th to 20thDay
19%6%11%28%23%12%
2138
21st to endDay
21%5%8%21%31%15%
2376
September1st to 10thDay
22%47%20%29%18%
2160
11th to 20thDay
20%5%8%24%27%16%
2107
21st to endDay
21%48%27%32%7%
1980
October1st to 10thDay
29%5%11%24%25%8%
1859
11th to 20thDay
25%5%10%27%24%8%
1800
21st to endDay
23%414%32%21%6%
1818
November1st to 10thDay
25%415%26%22%8%
1673
11th to 20thDay
24%413%31%24%4
1710
21st to endDay
26%412%28%26%4
1564
December1st to 10thDay
28%6%17%26%19%3
1520
11th to 20thDay
25%5%13%38%18%1
1924
21st to endDay
36%5%12%31%14%2
2794
January1st to 10thNight
30%5%13%37%13%1
4417
11th to 20thNight
30%8%20%22%17%3
4430
21st to endNight
28%5%21%33%12%1
4731
February1st to 10thNight
37%6%16%26%13%2
2470
11th to 20thNight
36%7%14%25%15%3
2247
21st to endNight
34%6%13%27%17%3
1830
March1st to 10thNight
32%5%11%29%20%4
2160
11th to 20thNight
30%5%14%27%20%3
2075
21st to endNight
38%6%15%26%14%2
2002
April1st to 10thNight
34%7%13%26%16%5%
1800
11th to 20thNight
36%6%14%24%16%3
1777
21st to endNight
41%6%9%27%16%1
1751
May1st to 10thNight
41%6%13%24%14%1
1594
11th to 20thNight
36%7%18%27%11%1
1418
21st to endNight
35%8%18%24%12%3
1552
June1st to 10thNight
28%9%23%23%13%4
1440
11th to 20thNight
27%6%16%26%18%7%
1440
21st to endNight
20%6%15%28%22%8%
1440
July1st to 10thNight
26%8%12%30%18%6%
1400
11th to 20thNight
17%6%13%27%23%14%
1392
21st to endNight
23%7%16%26%20%7%
1488
August1st to 10thNight
26%8%19%26%15%7%
1477
11th to 20thNight
20%6%14%26%23%11%
1761
21st to endNight
24%6%8%22%26%14%
1980
September1st to 10thNight
25%5%7%24%25%15%
1800
11th to 20thNight
23%5%8%26%25%12%
1852
21st to endNight
25%5%7%27%25%11%
1980
October1st to 10thNight
29%5%13%21%25%6%
2096
11th to 20thNight
27%411%27%21%11%
2160
21st to endNight
29%5%12%27%19%8%
2519
November1st to 10thNight
26%413%26%24%6%
2405
11th to 20thNight
28%5%11%31%21%6%
2470
21st to endNight
28%410%31%22%5%
2612
December1st to 10thNight
31%5%14%28%18%4
2660
11th to 20thNight
24%6%15%36%18%1
3272
21st to endNight
36%5%12%32%13%2
4873

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%6%30%31%19%5%
270
11th to 20thDay
10%12%38%27%12%1
270
21st to endDay
6%7%49%27%7%3
297
February1st to 10thDay
11%13%45%25%6%
270
11th to 20thDay
9%13%43%26%8%1
270
21st to endDay
9%20%32%33%6%
210
March1st to 10thDay
8%13%28%36%14%1
240
11th to 20thDay
12%14%31%29%12%2
321
21st to endDay
15%12%35%26%10%2
462
April1st to 10thDay
14%15%34%24%11%1
420
11th to 20thDay
16%21%30%24%8%2
412
21st to endDay
12%13%27%28%16%4
467
May1st to 10thDay
16%9%28%28%16%3
603
11th to 20thDay
19%7%20%29%19%5%
625
21st to endDay
14%8%23%28%21%5%
679
June1st to 10thDay
6%420%35%26%8%
630
11th to 20thDay
9%6%28%34%19%4
630
21st to endDay
6%322%36%28%5%
630
July1st to 10thDay
5%416%37%32%8%
621
11th to 20thDay
6%318%35%30%8%
618
21st to endDay
6%214%32%39%7%
684
August1st to 10thDay
5%118%37%32%7%
569
11th to 20thDay
4320%32%27%14%
437
21st to endDay
3323%31%27%12%
495
September1st to 10thDay
8%419%34%25%11%
450
11th to 20thDay
7%322%25%30%14%
397
21st to endDay
7%6%21%32%19%14%
270
October1st to 10thDay
13%5%23%23%20%16%
270
11th to 20thDay
10%9%30%28%16%9%
270
21st to endDay
9%11%32%29%14%5%
297
November1st to 10thDay
8%7%29%35%15%6%
270
11th to 20thDay
6%11%31%35%15%2
270
21st to endDay
9%9%31%36%11%4
270
December1st to 10thDay
7%18%31%32%11%1
270
11th to 20thDay
10%12%37%32%7%1
270
21st to endDay
12%16%29%27%14%1
297
January1st to 10thNight
7%10%37%35%11%1
950
11th to 20thNight
7%13%42%32%6%1
950
21st to endNight
9%6%44%33%7%
955
February1st to 10thNight
9%8%47%31%5%1
760
11th to 20thNight
11%6%43%35%5%
744
21st to endNight
8%12%45%30%5%
610
March1st to 10thNight
9%9%42%34%7%
720
11th to 20thNight
9%8%33%43%7%
720
21st to endNight
13%9%37%36%5%1
616
April1st to 10thNight
13%11%38%33%5%
540
11th to 20thNight
14%9%40%33%5%
533
21st to endNight
18%8%28%36%10%
540
May1st to 10thNight
19%7%26%36%13%
540
11th to 20thNight
18%5%23%41%12%1
531
21st to endNight
13%6%29%38%14%
584
June1st to 10thNight
8%428%39%19%1
540
11th to 20thNight
9%337%44%7%
540
21st to endNight
4330%49%14%
540
July1st to 10thNight
6%220%51%20%1
525
11th to 20thNight
5%121%54%18%1
522
21st to endNight
4216%53%24%1
591
August1st to 10thNight
6%219%52%22%
537
11th to 20thNight
4120%54%21%
534
21st to endNight
4321%51%22%
594
September1st to 10thNight
9%421%48%18%1
540
11th to 20thNight
8%321%45%21%1
540
21st to endNight
10%230%44%13%
540
October1st to 10thNight
14%428%36%16%1
656
11th to 20thNight
11%5%30%43%11%
720
21st to endNight
10%6%34%38%11%1
935
November1st to 10thNight
9%5%32%42%11%1
925
11th to 20thNight
5%10%40%38%7%1
950
21st to endNight
8%8%34%42%7%
950
December1st to 10thNight
8%9%45%33%5%
950
11th to 20thNight
8%8%41%37%6%
950
21st to endNight
11%11%41%32%6%
1045
Page generated at 2024-02-22 04:05:42. Version ac07

Copyright 2024 Attilla Danko


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