Lake Havasu City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Havasu City clear sky chart from 2005-11-05 to

2017-09-12
.

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
65%
15853
39%
46884
28%
15814
76%
15814
50%
21339

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
61%
719
35%
2327
28%
716
73%
716
39%
1098
January16th to endNight
57%
768
38%
2469
28%
768
72%
768
38%
1197
February1st to 15thNight
58%
700
39%
2112
31%
700
71%
700
46%
977
February16th to endNight
54%
632
37%
1895
29%
632
69%
632
39%
957
March1st to 15thNight
58%
720
38%
2067
28%
720
73%
720
47%
982
March16th to endNight
63%
768
39%
2112
26%
768
74%
768
49%
1019
April1st to 15thNight
56%
719
35%
1887
19%
719
65%
719
49%
927
April16th to endNight
59%
615
46%
1695
24%
615
73%
615
60%
714
May1st to 15thNight
60%
539
41%
1619
24%
539
71%
539
57%
654
May16th to endNight
59%
561
40%
1685
23%
561
71%
561
56%
691
June1st to 15thNight
69%
540
35%
1620
26%
540
75%
540
63%
634
June16th to endNight
72%
540
36%
1620
26%
540
79%
540
64%
640
July1st to 15thNight
75%
510
29%
1530
24%
510
77%
510
50%
715
July16th to endNight
70%
564
33%
1593
24%
531
80%
531
44%
790
August1st to 15thNight
78%
560
38%
1632
28%
557
80%
557
57%
738
August16th to endNight
80%
764
41%
1910
25%
764
85%
764
58%
973
September1st to 15thNight
77%
706
36%
1923
28%
706
80%
706
57%
909
September16th to endNight
76%
656
47%
1815
33%
656
87%
656
70%
755
October1st to 15thNight
71%
660
45%
1815
35%
660
78%
660
62%
826
October16th to endNight
77%
704
46%
2110
36%
704
88%
704
62%
875
November1st to 15thNight
69%
700
40%
2272
36%
700
78%
700
53%
948
November16th to endNight
64%
720
42%
2340
34%
720
80%
720
50%
975
December1st to 15thNight
59%
720
38%
2340
32%
720
71%
720
39%
1108
December16th to endNight
52%
768
38%
2496
28%
768
68%
768
35%
1237

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
212212335%73%
47772
Night
2112212335%72%
47079
TransparencyDay
14%2211%25%43%
47467
Night
15%2211%25%43%
46885
SeeingDay
316%21%34%20%3
5611
Night
317%9%30%33%6%
15861

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
3212222246%68%
1611
16th to endDay
5%213223236%66%
1753
February1st to 15thDay
3212213346%68%
1751
16th to endDay
5%213322336%63%
1579
March1st to 15thDay
2111221336%73%
1893
16th to endDay
1112213235%74%
2112
April1st to 15thDay
3211322336%70%
2059
16th to endDay
1111235%81%
2262
May1st to 15thDay
1111235%80%
2331
16th to endDay
1111223381%
2429
June1st to 15thDay
1111111385%
2340
16th to endDay
111112386%
2340
July1st to 15thDay
2212213345%70%
2340
16th to endDay
321242446%9%57%
2467
August1st to 15thDay
12222346%6%67%
2316
16th to endDay
312223335%72%
2292
September1st to 15thDay
123313246%69%
1955
16th to endDay
1111113383%
1815
October1st to 15thDay
112123335%74%
1815
16th to endDay
1121233478%
1760
November1st to 15thDay
11111232476%
1584
16th to endDay
311111336%74%
1620
December1st to 15thDay
331332335%7%62%
1620
16th to endDay
5%313222447%60%
1728
January1st to 15thNight
3213313436%65%
2327
16th to endNight
5%313322345%64%
2469
February1st to 15thNight
2212213245%70%
2101
16th to endNight
6%312213347%62%
1895
March1st to 15thNight
2111213347%69%
2067
16th to endNight
121221335%6%70%
2112
April1st to 15thNight
1112213335%73%
1887
16th to endNight
111112483%
1695
May1st to 15thNight
111235%81%
1619
16th to endNight
1111123381%
1684
June1st to 15thNight
11113484%
1620
16th to endNight
11111386%
1620
July1st to 15thNight
113234345%68%
1620
16th to endNight
3224325%46%9%55%
1701
August1st to 15thNight
212213348%69%
1641
16th to endNight
122312346%70%
1910
September1st to 15thNight
11221335%7%70%
1923
16th to endNight
11112385%
1815
October1st to 15thNight
22212345%75%
1815
16th to endNight
1112225%80%
2110
November1st to 15thNight
221212235%76%
2272
16th to endNight
31211123476%
2340
December1st to 15thNight
4212323335%66%
2340
16th to endNight
6%412322335%63%
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
18%2317%32%24%
1612
16th to endDay
22%2317%32%22%
1753
February1st to 15thDay
18%2316%27%31%
1751
16th to endDay
22%2214%32%25%
1579
March1st to 15thDay
14%1112%30%39%
1893
16th to endDay
14%2113%34%32%
2112
April1st to 15thDay
16%219%30%40%
2059
16th to endDay
7%210%28%50%
2262
May1st to 15thDay
8%2110%24%52%
2331
16th to endDay
9%17%22%57%
2432
June1st to 15thDay
8%314%72%
2340
16th to endDay
7%137%80%
2340
July1st to 15thDay
16%238%17%51%
2201
16th to endDay
21%46%18%23%25%
2312
August1st to 15thDay
16%3212%25%39%
2301
16th to endDay
15%2310%27%40%
2292
September1st to 15thDay
17%2312%21%42%
1955
16th to endDay
8%11418%65%
1815
October1st to 15thDay
14%118%26%46%
1815
16th to endDay
11%129%24%50%
1760
November1st to 15thDay
13%1212%31%37%
1584
16th to endDay
12%2213%32%36%
1620
December1st to 15thDay
22%2322%27%21%
1620
16th to endDay
22%27%23%26%16%
1728
January1st to 15thNight
20%3214%29%29%
2327
16th to endNight
22%3215%25%30%
2469
February1st to 15thNight
17%1315%26%35%
2112
16th to endNight
23%2213%28%30%
1895
March1st to 15thNight
16%2210%29%39%
2067
16th to endNight
15%2212%30%36%
2112
April1st to 15thNight
15%228%30%41%
1887
16th to endNight
7%19%25%54%
1695
May1st to 15thNight
8%118%27%51%
1620
16th to endNight
9%17%23%56%
1685
June1st to 15thNight
7%1416%70%
1620
16th to endNight
7%128%80%
1620
July1st to 15thNight
17%239%15%51%
1530
16th to endNight
21%36%19%22%27%
1593
August1st to 15thNight
14%2111%25%44%
1632
16th to endNight
15%2210%24%43%
1910
September1st to 15thNight
14%2315%22%41%
1923
16th to endNight
7%417%68%
1815
October1st to 15thNight
12%128%26%48%
1815
16th to endNight
10%138%20%56%
2110
November1st to 15thNight
13%218%28%45%
2272
16th to endNight
13%229%31%41%
2340
December1st to 15thNight
21%2215%30%27%
2340
16th to endNight
24%2320%30%19%
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
21%10%24%33%11%
90
16th to endDay
8%9%19%28%27%7%
121
February1st to 15thDay
5%21%22%26%20%3
266
16th to endDay
6%25%26%26%14%1
238
March1st to 15thDay
226%18%32%16%3
270
16th to endDay
229%21%25%18%2
288
April1st to 15thDay
5%27%30%17%14%4
269
16th to endDay
337%25%19%11%2
270
May1st to 15thDay
223%34%26%10%3
288
16th to endDay
24%30%30%11%2
330
June1st to 15thDay
117%28%38%12%1
315
16th to endDay
11%20%42%20%3
315
July1st to 15thDay
18%14%47%24%2
305
16th to endDay
49%6%41%35%2
327
August1st to 15thDay
46%16%44%23%5%
315
16th to endDay
26%11%40%29%9%
332
September1st to 15thDay
18%23%40%22%4
300
16th to endDay
312%18%39%22%3
255
October1st to 15thDay
16%27%29%21%3
255
16th to endDay
18%11%38%39%1
96
November1st to 15thDay
2416%28%38%8%
90
16th to endDay
410%33%28%22%1
90
December1st to 15thDay
27%18%42%24%4
90
16th to endDay
9%11%20%38%18%1
96
January1st to 15thNight
320%7%35%26%5%
720
16th to endNight
6%19%11%32%23%6%
768
February1st to 15thNight
420%12%33%25%3
704
16th to endNight
8%19%14%35%18%4
632
March1st to 15thNight
322%13%32%24%3
720
16th to endNight
221%9%34%26%5%
768
April1st to 15thNight
123%15%33%21%4
719
16th to endNight
24%13%34%22%4
615
May1st to 15thNight
121%15%32%27%2
540
16th to endNight
122%15%32%25%3
563
June1st to 15thNight
17%9%34%34%2
540
16th to endNight
17%6%29%39%5%
540
July1st to 15thNight
312%422%49%7%
510
16th to endNight
216%117%53%7%
564
August1st to 15thNight
310%316%59%7%
560
16th to endNight
38%217%52%14%
764
September1st to 15thNight
29%6%23%47%11%
706
16th to endNight
110%8%28%40%9%
656
October1st to 15thNight
211%11%33%35%5%
660
16th to endNight
111%5%33%38%9%
704
November1st to 15thNight
216%9%34%30%7%
700
16th to endNight
419%8%28%32%6%
720
December1st to 15thNight
6%19%9%34%27%3
720
16th to endNight
9%22%11%32%21%3
768
Page generated at 2017-09-13 04:39:15. Version ac04

Copyright 2017 A. Danko


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