Loveland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Loveland clear sky chart from 2005-11-06 to 2024-01-13.

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
40%
23864
18%
74176
13%
23810
46%
23810
22%
50169

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
18%
921
12%
2619
6%
917
24%
917
13%
2084
January11th to 20thNight
17%
729
12%
2367
6%
729
24%
729
11%
1832
January21st to endNight
20%
792
14%
2574
7%
792
28%
792
14%
1921
February1st to 10thNight
21%
720
11%
2254
6%
720
27%
720
13%
1701
February11th to 20thNight
20%
701
14%
2099
7%
700
26%
700
16%
1531
February21st to endNight
17%
592
14%
1776
5%
592
27%
592
14%
1317
March1st to 10thNight
25%
720
16%
2139
9%
720
31%
720
19%
1467
March11th to 20thNight
26%
720
16%
1980
8%
720
33%
720
20%
1406
March21st to endNight
28%
792
15%
2178
7%
792
35%
792
19%
1576
April1st to 10thNight
32%
604
17%
1864
11%
604
39%
604
23%
1251
April11th to 20thNight
36%
533
21%
1716
13%
533
46%
533
25%
1100
April21st to endNight
30%
540
18%
1620
8%
540
40%
540
23%
1096
May1st to 10thNight
34%
540
14%
1620
8%
540
39%
540
20%
1157
May11th to 20thNight
46%
531
15%
1593
10%
531
50%
531
23%
1089
May21st to endNight
59%
583
17%
1745
12%
582
62%
582
32%
1073
June1st to 10thNight
61%
540
17%
1620
15%
540
64%
540
34%
969
June11th to 20thNight
64%
540
21%
1463
16%
540
68%
540
37%
892
June21st to endNight
62%
540
19%
1440
15%
540
66%
540
35%
904
July1st to 10thNight
63%
525
18%
1400
16%
525
65%
525
33%
889
July11th to 20thNight
68%
522
19%
1497
16%
522
70%
522
37%
892
July21st to endNight
67%
591
22%
1672
20%
558
69%
558
34%
1005
August1st to 10thNight
71%
537
22%
1600
21%
534
72%
534
34%
949
August11th to 20thNight
68%
534
22%
1598
19%
534
71%
534
33%
967
August21st to endNight
70%
594
25%
1942
23%
594
74%
594
39%
1028
September1st to 10thNight
62%
639
24%
1899
19%
639
66%
639
34%
1126
September11th to 20thNight
66%
720
29%
1980
24%
720
68%
720
39%
1168
September21st to endNight
52%
720
28%
1980
21%
720
57%
720
35%
1224
October1st to 10thNight
55%
720
27%
1980
21%
720
61%
720
38%
1161
October11th to 20thNight
40%
720
22%
2140
16%
720
48%
720
27%
1359
October21st to endNight
33%
792
22%
2497
16%
792
42%
792
22%
1652
November1st to 10thNight
40%
740
23%
2406
18%
740
50%
740
27%
1448
November11th to 20thNight
30%
760
22%
2470
13%
760
43%
760
21%
1597
November21st to endNight
32%
760
18%
2470
13%
760
39%
760
18%
1724
December1st to 10thNight
23%
760
12%
2470
6%
760
31%
760
15%
1820
December11th to 20thNight
24%
759
14%
2996
8%
759
31%
759
13%
2171
December21st to endNight
18%
833
8%
4512
7%
821
26%
821
6%
3623

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
15%9%36%6%35%5%5%7%37%
75239
Night
15%9%46%5%3445%7%38%
74442
TransparencyDay
46%6%12%21%13%2
74954
Night
46%6%11%21%14%2
74248
SeeingDay
18%11%26%23%15%6%
14152
Night
19%9%27%29%15%2
23875

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
18%12%6%10%7%34445%26%
1531
11th to 20thDay
21%13%7%10%6%34445%24%
1638
21st to endDay
16%16%5%9%7%35%45%5%25%
1782
February1st to 10thDay
20%14%6%8%6%3344428%
1701
11th to 20thDay
17%11%5%10%7%44336%28%
1748
21st to endDay
19%14%6%8%6%33436%29%
1480
March1st to 10thDay
17%11%37%6%345%46%34%
1819
11th to 20thDay
19%11%47%6%335%5%6%31%
1980
21st to endDay
23%10%46%5%35%446%29%
2178
April1st to 10thDay
15%8%46%5%35%5%5%7%37%
2110
11th to 20thDay
16%9%37%5%34447%39%
2191
21st to endDay
18%8%37%5%445%5%6%35%
2340
May1st to 10thDay
21%7%36%5%45%45%6%34%
2340
11th to 20thDay
19%8%47%5%35%5%5%7%34%
2301
21st to endDay
9%6%26%7%46%7%8%10%36%
2531
June1st to 10thDay
12%5%25%6%36%6%6%8%41%
2340
11th to 20thDay
10%5%25%5%35%5%7%9%44%
2491
21st to endDay
8%6%36%5%46%5%7%10%40%
2520
July1st to 10thDay
11%6%36%6%45%5%7%9%38%
2520
11th to 20thDay
8%5%25%5%47%6%6%10%41%
2410
21st to endDay
10%5%346%46%7%6%10%40%
2547
August1st to 10thDay
8%5%25%6%35%6%7%10%43%
2327
11th to 20thDay
8%6%36%6%45%6%7%10%39%
2303
21st to endDay
8%5%25%6%35%5%6%9%46%
2411
September1st to 10thDay
12%6%25%43446%6%48%
2042
11th to 20thDay
10%425%5%245%7%9%47%
1980
21st to endDay
15%5%26%5%33447%48%
1980
October1st to 10thDay
11%5%25%6%35%5%5%7%47%
1980
11th to 20thDay
14%7%25%5%35%446%45%
1818
21st to endDay
20%9%36%5%24447%37%
1854
November1st to 10thDay
9%6%25%5%23447%52%
1672
11th to 20thDay
14%11%5%7%43445%6%37%
1710
21st to endDay
18%9%47%5%34446%36%
1710
December1st to 10thDay
21%11%7%9%7%44445%25%
1710
11th to 20thDay
16%14%6%9%6%45%445%28%
2153
21st to endDay
20%21%5%9%7%44446%17%
3091
January1st to 10thNight
16%13%7%11%8%345%4425%
2619
11th to 20thNight
19%15%5%8%7%34445%26%
2367
21st to endNight
16%14%6%10%6%34435%28%
2574
February1st to 10thNight
23%12%48%5%34445%27%
2254
11th to 20thNight
18%11%48%6%35%46%6%30%
2098
21st to endNight
21%15%5%6%433446%29%
1776
March1st to 10thNight
17%9%46%5%34446%38%
2139
11th to 20thNight
18%9%37%6%345%47%35%
1980
21st to endNight
20%9%46%5%35%5%5%6%33%
2178
April1st to 10thNight
15%8%35%5%35%5%5%8%39%
1864
11th to 20thNight
14%8%25%5%345%7%7%41%
1716
21st to endNight
17%7%36%6%3436%7%37%
1620
May1st to 10thNight
18%8%37%5%35%5%5%7%33%
1620
11th to 20thNight
16%7%35%5%36%5%5%7%38%
1592
21st to endNight
7%5%25%5%35%6%8%12%43%
1744
June1st to 10thNight
7%5%245%35%5%5%8%50%
1620
11th to 20thNight
9%5%25%425%5%7%11%47%
1463
21st to endNight
7%3345%45%6%6%10%47%
1440
July1st to 10thNight
11%5%25%5%3446%8%47%
1440
11th to 20thNight
6%434435%5%6%11%49%
1546
21st to endNight
8%5%25%6%4445%9%48%
1771
August1st to 10thNight
7%425%5%35%5%7%9%49%
1611
11th to 20thNight
7%5%25%5%346%6%10%46%
1598
21st to endNight
6%32443346%9%55%
1942
September1st to 10thNight
12%5%24435%35%6%51%
1899
11th to 20thNight
8%424424447%55%
1980
21st to endNight
13%5%25%424346%52%
1980
October1st to 10thNight
8%425%5%24447%54%
1980
11th to 20thNight
14%7%26%5%3445%7%43%
2140
21st to endNight
19%7%35%433446%40%
2497
November1st to 10thNight
14%7%35%43345%6%48%
2406
11th to 20thNight
16%8%36%5%33446%41%
2470
21st to endNight
19%10%47%6%33446%33%
2470
December1st to 10thNight
21%11%48%5%4445%6%28%
2470
11th to 20thNight
19%12%7%8%6%34446%29%
3042
21st to endNight
20%18%7%10%7%44445%17%
4536

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
60%410%15%11%
1532
11th to 20thDay
63%5%11%14%5%
1638
21st to endDay
61%5%11%17%5%1
1782
February1st to 10thDay
61%410%16%8%1
1701
11th to 20thDay
59%411%17%9%1
1758
21st to endDay
57%5%9%19%9%2
1480
March1st to 10thDay
51%5%11%23%9%1
1819
11th to 20thDay
53%6%11%18%10%2
1980
21st to endDay
56%5%10%20%8%1
2178
April1st to 10thDay
47%6%11%23%13%1
2110
11th to 20thDay
46%6%10%20%15%3
2191
21st to endDay
49%6%10%22%11%2
2340
May1st to 10thDay
50%7%12%21%9%1
2340
11th to 20thDay
50%8%11%18%12%1
2305
21st to endDay
40%11%16%21%12%1
2531
June1st to 10thDay
39%9%11%23%16%2
2340
11th to 20thDay
35%8%14%24%18%2
2491
21st to endDay
39%9%15%21%13%4
2520
July1st to 10thDay
41%9%12%19%17%2
2451
11th to 20thDay
37%8%13%24%17%2
2337
21st to endDay
36%9%15%23%13%3
2405
August1st to 10thDay
33%9%15%27%13%2
2314
11th to 20thDay
38%8%13%26%14%1
2303
21st to endDay
33%7%15%23%17%5%
2411
September1st to 10thDay
35%6%11%24%17%5%
2042
11th to 20thDay
32%6%13%25%21%2
1980
21st to endDay
38%410%25%22%2
1980
October1st to 10thDay
35%7%11%24%21%2
1980
11th to 20thDay
40%49%25%19%3
1818
21st to endDay
48%412%20%15%2
1854
November1st to 10thDay
33%5%10%28%21%3
1672
11th to 20thDay
48%49%21%16%3
1710
21st to endDay
50%410%22%13%1
1710
December1st to 10thDay
63%411%17%5%
1710
11th to 20thDay
59%49%18%10%
2150
21st to endDay
69%5%9%10%6%1
3091
January1st to 10thNight
62%6%7%16%9%
2619
11th to 20thNight
62%5%10%17%6%1
2367
21st to endNight
59%410%19%7%1
2574
February1st to 10thNight
60%411%18%6%1
2254
11th to 20thNight
54%5%10%19%11%1
2099
21st to endNight
57%411%16%9%2
1776
March1st to 10thNight
49%48%22%14%2
2139
11th to 20thNight
49%6%12%21%10%2
1980
21st to endNight
52%5%11%21%9%2
2178
April1st to 10thNight
44%6%11%25%12%2
1864
11th to 20thNight
41%5%11%17%20%5%
1716
21st to endNight
46%5%11%21%13%3
1620
May1st to 10thNight
49%7%10%20%10%3
1620
11th to 20thNight
44%8%14%18%14%2
1593
21st to endNight
32%10%17%23%15%3
1745
June1st to 10thNight
31%8%11%27%20%3
1620
11th to 20thNight
29%9%16%22%19%4
1463
21st to endNight
30%10%16%22%16%5%
1440
July1st to 10thNight
34%8%13%22%19%4
1400
11th to 20thNight
29%9%15%26%19%3
1497
21st to endNight
31%9%13%30%16%2
1672
August1st to 10thNight
29%10%16%28%16%2
1600
11th to 20thNight
31%9%14%28%16%1
1598
21st to endNight
25%8%15%26%21%5%
1942
September1st to 10thNight
32%6%12%25%17%7%
1899
11th to 20thNight
29%7%11%24%28%2
1980
21st to endNight
35%5%9%22%26%3
1980
October1st to 10thNight
31%5%11%27%23%3
1980
11th to 20thNight
40%5%9%24%20%2
2140
21st to endNight
46%49%22%16%3
2497
November1st to 10thNight
38%411%20%22%4
2406
11th to 20thNight
45%49%21%18%3
2470
21st to endNight
52%410%21%11%2
2470
December1st to 10thNight
57%5%11%18%8%1
2470
11th to 20thNight
56%5%9%20%9%1
3044
21st to endNight
69%5%9%13%4
4536

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
26%21%34%14%4
270
11th to 20thDay
27%18%41%11%3
246
21st to endDay
29%22%31%16%2
264
February1st to 10thDay
33%24%31%10%3
240
11th to 20thDay
31%24%34%11%
240
21st to endDay
30%20%42%7%1
198
March1st to 10thDay
22%29%37%10%2
259
11th to 20thDay
25%16%35%18%5%
420
21st to endDay
31%18%29%16%6%
462
April1st to 10thDay
19%19%29%23%9%1
420
11th to 20thDay
21%20%25%19%12%4
412
21st to endDay
23%15%34%16%9%2
420
May1st to 10thDay
24%14%34%17%8%4
423
11th to 20thDay
20%9%28%24%13%5%
447
21st to endDay
14%5%24%28%18%10%
485
June1st to 10thDay
12%7%20%31%22%8%
450
11th to 20thDay
12%5%24%30%22%6%
601
21st to endDay
10%5%25%32%20%8%
630
July1st to 10thDay
12%416%25%23%20%
621
11th to 20thDay
10%420%30%25%12%
510
21st to endDay
11%316%31%25%14%
488
August1st to 10thDay
12%313%27%30%15%
446
11th to 20thDay
11%5%17%30%24%12%
439
21st to endDay
9%415%30%28%14%
495
September1st to 10thDay
12%419%26%29%10%
450
11th to 20thDay
11%416%24%32%14%
450
21st to endDay
16%8%22%26%20%8%
450
October1st to 10thDay
10%7%26%31%18%7%
450
11th to 20thDay
17%14%32%23%12%2
450
21st to endDay
25%13%36%21%5%
369
November1st to 10thDay
14%14%34%24%11%3
270
11th to 20thDay
23%21%27%19%7%3
270
21st to endDay
23%17%40%17%4
270
December1st to 10thDay
22%21%34%17%5%
270
11th to 20thDay
20%21%39%14%6%
270
21st to endDay
30%21%33%14%2
297
January1st to 10thNight
22%19%34%21%4
921
11th to 20thNight
28%15%34%20%3
729
21st to endNight
22%16%35%24%2
792
February1st to 10thNight
30%12%33%24%2
720
11th to 20thNight
24%16%36%22%2
703
21st to endNight
30%13%36%20%2
592
March1st to 10thNight
21%14%36%23%5%
720
11th to 20thNight
24%12%35%23%6%1
720
21st to endNight
24%10%32%26%7%
792
April1st to 10thNight
19%12%33%28%7%
604
11th to 20thNight
19%10%31%27%11%1
533
21st to endNight
18%9%37%28%7%1
540
May1st to 10thNight
22%8%31%27%11%1
540
11th to 20thNight
19%424%34%18%2
531
21st to endNight
10%222%36%25%5%
584
June1st to 10thNight
9%221%42%25%1
540
11th to 20thNight
10%316%42%27%2
540
21st to endNight
7%221%43%25%2
540
July1st to 10thNight
12%211%33%33%9%
525
11th to 20thNight
7%214%37%35%4
522
21st to endNight
10%312%38%34%3
591
August1st to 10thNight
9%19%42%36%3
537
11th to 20thNight
10%113%41%30%5%
534
21st to endNight
8%114%35%36%7%
594
September1st to 10thNight
14%213%33%34%4
639
11th to 20thNight
9%216%34%33%6%
720
21st to endNight
14%5%23%31%25%2
720
October1st to 10thNight
11%424%34%23%4
720
11th to 20thNight
18%8%28%32%13%1
720
21st to endNight
23%9%33%24%10%
792
November1st to 10thNight
17%8%30%28%15%1
740
11th to 20thNight
19%15%30%25%10%1
760
21st to endNight
24%11%28%28%7%1
760
December1st to 10thNight
27%12%32%24%5%
760
11th to 20thNight
24%11%34%24%6%1
760
21st to endNight
29%15%32%22%3
840
Page generated at 2024-01-10 01:25:06. Version ac07

Copyright 2024 Attilla Danko


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