Lovell Canyon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lovell Canyon clear sky chart from 2005-11-05 to 2017-09-18.

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
69%
15905
36%
46928
29%
15869
75%
15869
56%
21740

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 15thNight
65%
716
32%
2327
29%
716
73%
716
48%
1093
January16th to endNight
61%
768
35%
2448
31%
768
71%
768
45%
1216
February1st to 15thNight
62%
696
33%
2112
29%
696
71%
696
48%
1052
February16th to endNight
57%
632
34%
1895
33%
632
65%
632
45%
958
March1st to 15thNight
59%
720
33%
2118
26%
720
70%
720
50%
1027
March16th to endNight
62%
768
36%
2109
26%
768
71%
768
52%
1048
April1st to 15thNight
48%
719
34%
1799
14%
719
60%
719
53%
941
April16th to endNight
59%
645
39%
1725
20%
645
70%
645
61%
805
May1st to 15thNight
61%
539
35%
1619
23%
539
69%
539
62%
692
May16th to endNight
63%
561
35%
1685
24%
561
71%
561
59%
722
June1st to 15thNight
68%
540
32%
1620
25%
540
73%
540
70%
650
June16th to endNight
75%
507
37%
1587
32%
507
81%
507
81%
572
July1st to 15thNight
85%
508
29%
1528
27%
508
86%
508
60%
680
July16th to endNight
82%
564
33%
1593
29%
531
84%
531
54%
756
August1st to 15thNight
85%
599
38%
1671
28%
596
86%
596
66%
758
August16th to endNight
87%
764
41%
1910
28%
764
88%
764
70%
930
September1st to 15thNight
85%
720
36%
1905
28%
720
87%
720
63%
932
September16th to endNight
81%
667
46%
1847
38%
667
87%
667
78%
756
October1st to 15thNight
71%
660
41%
1815
32%
660
79%
660
61%
849
October16th to endNight
72%
704
41%
2164
37%
704
81%
704
62%
917
November1st to 15thNight
73%
700
37%
2275
35%
700
81%
700
60%
947
November16th to endNight
71%
720
40%
2340
38%
720
78%
720
57%
1004
December1st to 15thNight
67%
720
33%
2340
32%
720
73%
720
45%
1125
December16th to endNight
56%
768
32%
2496
28%
768
65%
768
37%
1310

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
2213323346%66%
47832
Night
2213313346%67%
47123
TransparencyDay
16%26%13%27%33%
47527
Night
16%25%15%27%32%
46929
SeeingDay
49%24%37%19%4
5689
Night
35%16%32%31%10%
15920

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 15thDay
2313213446%65%
1611
16th to endDay
4423422346%60%
1776
February1st to 15thDay
331343445%6%60%
1751
16th to endDay
34245%34445%56%
1579
March1st to 15thDay
1213324449%63%
1842
16th to endDay
12244245%5%9%57%
2112
April1st to 15thDay
2325%323345%62%
2149
16th to endDay
2212223245%70%
2235
May1st to 15thDay
112323345%70%
2331
16th to endDay
1212313346%68%
2429
June1st to 15thDay
1212212235%75%
2340
16th to endDay
111112384%
2340
July1st to 15thDay
3213324445%64%
2340
16th to endDay
22245%2445%7%56%
2467
August1st to 15thDay
211122335%6%68%
2277
16th to endDay
211222345%5%68%
2292
September1st to 15thDay
212223345%69%
2053
16th to endDay
11121223478%
1838
October1st to 15thDay
3313212345%68%
1815
16th to endDay
11221224474%
1703
November1st to 15thDay
21331324470%
1584
16th to endDay
2112323348%66%
1620
December1st to 15thDay
3325%5%2335%7%56%
1620
16th to endDay
4435%333446%55%
1728
January1st to 15thNight
22135%33437%62%
2327
16th to endNight
5%41441335%6%58%
2448
February1st to 15thNight
2425%323336%61%
2101
16th to endNight
4324323446%58%
1895
March1st to 15thNight
121433445%6%62%
2118
16th to endNight
1213324348%63%
2109
April1st to 15thNight
2213423346%65%
1799
16th to endNight
22113235%73%
1725
May1st to 15thNight
1231435%5%70%
1619
16th to endNight
112212346%72%
1684
June1st to 15thNight
11121123478%
1620
16th to endNight
11112286%
1587
July1st to 15thNight
2213213336%69%
1618
16th to endNight
321332445%6%62%
1701
August1st to 15thNight
1112222336%72%
1680
16th to endNight
112222245%73%
1910
September1st to 15thNight
1112223345%71%
1905
16th to endNight
121112383%
1847
October1st to 15thNight
3112222235%72%
1815
16th to endNight
1212212335%73%
2164
November1st to 15thNight
223213335%70%
2275
16th to endNight
1113312346%69%
2340
December1st to 15thNight
33135%2335%7%59%
2340
16th to endNight
5%435%424336%55%
2496

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 15thDay
15%48%24%34%12%
1612
16th to endDay
23%28%23%29%13%
1776
February1st to 15thDay
19%48%20%29%16%
1751
16th to endDay
25%39%14%31%15%
1579
March1st to 15thDay
16%28%19%35%18%
1842
16th to endDay
20%39%20%29%16%
2112
April1st to 15thDay
20%35%16%30%24%
2149
16th to endDay
15%1416%32%29%
2235
May1st to 15thDay
13%15%13%31%34%
2331
16th to endDay
15%15%8%33%35%
2432
June1st to 15thDay
11%27%19%58%
2340
16th to endDay
6%12312%74%
2340
July1st to 15thDay
20%246%15%50%
2201
16th to endDay
22%35%11%20%36%
2312
August1st to 15thDay
14%25%7%20%50%
2262
16th to endDay
16%248%20%48%
2292
September1st to 15thDay
15%25%7%19%49%
2053
16th to endDay
10%36%26%51%
1838
October1st to 15thDay
17%2411%30%34%
1815
16th to endDay
11%25%12%33%34%
1703
November1st to 15thDay
15%2416%37%23%
1584
16th to endDay
15%25%20%34%21%
1620
December1st to 15thDay
24%410%18%31%10%
1620
16th to endDay
25%410%25%23%11%
1728
January1st to 15thNight
19%37%21%33%14%
2327
16th to endNight
23%27%21%25%19%
2448
February1st to 15thNight
22%38%19%27%20%
2112
16th to endNight
23%28%17%33%15%
1895
March1st to 15thNight
17%46%16%34%19%
2118
16th to endNight
17%36%21%32%19%
2109
April1st to 15thNight
17%3418%33%21%
1799
16th to endNight
12%1318%29%33%
1725
May1st to 15thNight
13%1415%31%34%
1620
16th to endNight
12%25%10%33%36%
1685
June1st to 15thNight
9%147%19%58%
1620
16th to endNight
5%1413%73%
1587
July1st to 15thNight
15%239%16%52%
1528
16th to endNight
18%25%12%20%39%
1593
August1st to 15thNight
13%1310%16%54%
1671
16th to endNight
12%148%22%50%
1910
September1st to 15thNight
13%45%9%18%48%
1905
16th to endNight
7%27%26%56%
1847
October1st to 15thNight
14%1412%27%39%
1815
16th to endNight
12%15%11%26%41%
2164
November1st to 15thNight
13%15%16%37%25%
2275
16th to endNight
14%26%14%31%29%
2340
December1st to 15thNight
22%39%19%32%12%
2340
16th to endNight
26%49%22%23%12%
2496

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 15thDay
16%14%16%40%11%1
90
16th to endDay
7%11%21%31%20%7%
144
February1st to 15thDay
312%25%35%17%4
266
16th to endDay
6%20%32%27%10%2
238
March1st to 15thDay
318%27%27%20%1
270
16th to endDay
417%38%28%10%1
288
April1st to 15thDay
9%18%33%23%12%2
269
16th to endDay
7%26%30%24%10%1
270
May1st to 15thDay
413%31%35%13%2
288
16th to endDay
413%26%33%16%4
330
June1st to 15thDay
46%31%41%11%4
315
16th to endDay
15%24%39%21%8%
315
July1st to 15thDay
3116%49%22%6%
305
16th to endDay
6%11%46%27%8%
327
August1st to 15thDay
2221%48%17%6%
315
16th to endDay
5%113%42%28%8%
332
September1st to 15thDay
2221%44%26%3
315
16th to endDay
36%20%36%30%2
264
October1st to 15thDay
48%32%36%15%2
255
16th to endDay
5%7%20%37%27%1
127
November1st to 15thDay
3218%30%33%12%
90
16th to endDay
210%26%42%18%
90
December1st to 15thDay
1421%50%20%3
90
16th to endDay
8%6%19%39%20%5%
96
January1st to 15thNight
5%417%33%27%12%
720
16th to endNight
6%419%34%24%10%
768
February1st to 15thNight
4419%37%24%9%
704
16th to endNight
6%8%23%35%18%8%
632
March1st to 15thNight
28%24%34%21%9%
720
16th to endNight
211%17%36%24%7%
768
April1st to 15thNight
212%28%28%19%8%
719
16th to endNight
29%25%32%23%7%
645
May1st to 15thNight
25%25%34%26%5%
540
16th to endNight
29%19%30%31%6%
563
June1st to 15thNight
1422%38%28%4
540
16th to endNight
1119%32%37%7%
507
July1st to 15thNight
36%34%48%7%
508
16th to endNight
4429%54%6%
564
August1st to 15thNight
15%34%50%7%
599
16th to endNight
25%24%46%20%
764
September1st to 15thNight
25%29%45%17%
720
16th to endNight
1111%28%36%20%
667
October1st to 15thNight
3317%33%29%12%
660
16th to endNight
3414%27%32%16%
704
November1st to 15thNight
1317%30%34%12%
700
16th to endNight
2415%33%31%11%
720
December1st to 15thNight
5%6%12%36%31%8%
720
16th to endNight
6%9%18%32%25%7%
768
Page generated at 2017-09-19 04:32:27. Version ac04

Copyright 2017 A. Danko


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