Hualapai Mountain County Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hualapai Mountain County Park clear sky chart from 2005-11-05 to 2018-03-11.

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
70%
16506
36%
49100
30%
16469
77%
16469
55%
23013

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%
777
32%
2522
29%
776
73%
776
45%
1222
January16th to endNight
62%
832
35%
2704
31%
832
71%
832
43%
1345
February1st to 15thNight
66%
758
36%
2298
29%
758
76%
758
50%
1120
February16th to endNight
58%
684
34%
2051
33%
684
64%
684
45%
1056
March1st to 15thNight
64%
764
34%
2182
28%
764
73%
764
52%
1074
March16th to endNight
67%
768
35%
2112
26%
768
74%
768
55%
1025
April1st to 15thNight
56%
719
31%
1904
17%
719
65%
719
52%
970
April16th to endNight
64%
591
43%
1671
24%
591
77%
591
66%
725
May1st to 15thNight
65%
539
37%
1619
25%
539
72%
539
64%
679
May16th to endNight
64%
561
37%
1685
26%
561
71%
561
64%
705
June1st to 15thNight
74%
540
33%
1620
28%
540
77%
540
71%
652
June16th to endNight
82%
540
35%
1620
31%
540
83%
540
77%
630
July1st to 15thNight
83%
510
26%
1530
23%
510
83%
510
52%
751
July16th to endNight
81%
564
28%
1593
24%
531
83%
531
43%
849
August1st to 15thNight
84%
539
36%
1611
30%
536
85%
536
56%
754
August16th to endNight
84%
744
39%
1890
29%
744
84%
744
58%
983
September1st to 15thNight
80%
720
32%
1971
26%
720
82%
720
55%
1009
September16th to endNight
80%
716
46%
1980
36%
716
87%
716
75%
833
October1st to 15thNight
75%
720
41%
1998
32%
720
82%
720
65%
899
October16th to endNight
76%
768
45%
2304
40%
768
83%
768
66%
975
November1st to 15thNight
73%
760
36%
2461
33%
760
82%
760
58%
1056
November16th to endNight
70%
780
41%
2535
39%
780
79%
780
56%
1093
December1st to 15thNight
67%
780
34%
2535
31%
780
74%
780
46%
1223
December16th to endNight
59%
832
36%
2704
32%
832
67%
832
40%
1385

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%
49526
Night
2213323345%68%
49295
TransparencyDay
17%36%12%26%33%
49221
Night
16%36%13%28%31%
49101
SeeingDay
413%29%33%15%4
6171
Night
4415%33%32%9%
16518

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
3423323346%62%
1746
16th to endDay
5%31342335%6%60%
1872
February1st to 15thDay
4413423347%62%
1892
16th to endDay
7%423434346%55%
1709
March1st to 15thDay
331331335%6%65%
2014
16th to endDay
3212323447%64%
2112
April1st to 15thDay
2214423346%64%
2041
16th to endDay
1112222226%74%
2286
May1st to 15thDay
1112322345%72%
2331
16th to endDay
2112212235%74%
2429
June1st to 15thDay
1111212481%
2340
16th to endDay
111222283%
2340
July1st to 15thDay
22124245%46%62%
2340
16th to endDay
3335%5%26%7%7%9%45%
2467
August1st to 15thDay
22134245%5%7%59%
2340
16th to endDay
22135%2445%7%61%
2309
September1st to 15thDay
221343446%7%59%
1989
16th to endDay
11221222478%
1980
October1st to 15thDay
211221344471%
1961
16th to endDay
112211335%75%
1920
November1st to 15thDay
1212313336%70%
1726
16th to endDay
3212223335%68%
1755
December1st to 15thDay
35%1442345%7%58%
1755
16th to endDay
7%41341345%6%57%
1872
January1st to 15thNight
33135%23446%61%
2522
16th to endNight
5%413423345%61%
2704
February1st to 15thNight
3313323336%65%
2287
16th to endNight
5%41431335%7%58%
2051
March1st to 15thNight
221232435%7%63%
2182
16th to endNight
1212323446%66%
2112
April1st to 15thNight
2213423225%69%
1904
16th to endNight
1111112236%77%
1671
May1st to 15thNight
111212245%75%
1619
16th to endNight
11321223476%
1684
June1st to 15thNight
221223479%
1620
16th to endNight
121122283%
1620
July1st to 15thNight
211332445%7%63%
1620
16th to endNight
3223425%5%7%8%51%
1701
August1st to 15thNight
322223448%65%
1620
16th to endNight
321322235%7%65%
1890
September1st to 15thNight
224324446%64%
1971
16th to endNight
1111112382%
1980
October1st to 15thNight
112213235%75%
1998
16th to endNight
121211235%76%
2304
November1st to 15thNight
1212313345%70%
2461
16th to endNight
322213335%71%
2535
December1st to 15thNight
431232335%5%63%
2535
16th to endNight
7%314413346%58%
2704

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
21%36%16%32%19%
1747
16th to endDay
24%36%16%31%17%
1872
February1st to 15thDay
22%26%14%28%24%
1892
16th to endDay
29%26%13%29%18%
1709
March1st to 15thDay
18%25%13%35%24%
2014
16th to endDay
17%46%17%33%21%
2112
April1st to 15thDay
18%27%13%28%28%
2041
16th to endDay
12%1413%29%36%
2286
May1st to 15thDay
12%2411%31%36%
2331
16th to endDay
13%15%8%31%39%
2432
June1st to 15thDay
8%126%17%62%
2340
16th to endDay
7%13412%70%
2340
July1st to 15thDay
20%45%10%15%42%
2201
16th to endDay
29%7%10%16%16%19%
2312
August1st to 15thDay
21%5%7%12%22%30%
2325
16th to endDay
21%47%11%28%26%
2309
September1st to 15thDay
20%48%13%23%28%
1989
16th to endDay
11%227%28%47%
1980
October1st to 15thDay
14%2410%27%39%
1961
16th to endDay
12%15%10%28%41%
1920
November1st to 15thDay
14%26%16%32%27%
1726
16th to endDay
16%35%15%27%31%
1755
December1st to 15thDay
23%47%19%22%21%
1755
16th to endDay
24%48%20%26%15%
1872
January1st to 15thNight
21%45%16%33%17%
2522
16th to endNight
24%36%18%25%22%
2704
February1st to 15thNight
20%37%17%25%26%
2298
16th to endNight
23%37%13%33%18%
2051
March1st to 15thNight
17%37%12%36%22%
2182
16th to endNight
16%39%16%32%22%
2112
April1st to 15thNight
18%25%13%36%23%
1904
16th to endNight
10%2312%34%36%
1671
May1st to 15thNight
11%25%12%32%35%
1620
16th to endNight
11%16%9%33%38%
1685
June1st to 15thNight
9%136%19%60%
1620
16th to endNight
7%12412%71%
1620
July1st to 15thNight
18%46%11%13%44%
1530
16th to endNight
22%7%12%19%20%17%
1593
August1st to 15thNight
16%36%14%27%32%
1611
16th to endNight
18%35%14%29%27%
1890
September1st to 15thNight
19%38%15%22%30%
1971
16th to endNight
8%137%27%52%
1980
October1st to 15thNight
12%25%11%27%40%
1998
16th to endNight
11%15%10%24%46%
2304
November1st to 15thNight
14%25%15%35%27%
2461
16th to endNight
15%25%14%29%33%
2535
December1st to 15thNight
20%46%17%26%24%
2535
16th to endNight
25%38%18%28%14%
2704

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
13%11%25%29%15%4
135
16th to endDay
6%10%20%28%21%11%
144
February1st to 15thDay
7%16%29%25%15%4
317
16th to endDay
8%24%35%20%10%
290
March1st to 15thDay
6%20%32%27%11%1
312
16th to endDay
223%35%24%10%2
288
April1st to 15thDay
8%28%29%22%8%2
269
16th to endDay
435%30%22%5%1
270
May1st to 15thDay
5%20%35%26%10%2
288
16th to endDay
317%39%28%8%2
330
June1st to 15thDay
112%39%35%8%2
315
16th to endDay
1430%44%13%5%
315
July1st to 15thDay
3128%47%15%3
305
16th to endDay
4115%48%24%6%
327
August1st to 15thDay
3224%46%17%5%
315
16th to endDay
2121%46%21%7%
332
September1st to 15thDay
25%32%40%14%5%
315
16th to endDay
311%27%37%16%3
315
October1st to 15thDay
317%35%27%12%3
296
16th to endDay
17%16%34%31%8%
144
November1st to 15thDay
26%24%34%26%5%
135
16th to endDay
415%24%30%22%2
135
December1st to 15thDay
8%25%31%29%4
135
16th to endDay
8%9%20%34%24%4
144
January1st to 15thNight
35%19%36%24%10%
780
16th to endNight
8%418%34%26%7%
832
February1st to 15thNight
5%418%36%27%7%
764
16th to endNight
7%5%22%38%20%4
684
March1st to 15thNight
47%19%37%26%4
764
16th to endNight
26%17%39%26%7%
768
April1st to 15thNight
310%24%33%22%5%
719
16th to endNight
18%23%38%22%5%
591
May1st to 15thNight
25%23%34%28%5%
540
16th to endNight
26%22%35%26%6%
563
June1st to 15thNight
318%40%31%5%
540
16th to endNight
1111%35%43%6%
540
July1st to 15thNight
4428%51%10%
510
16th to endNight
4321%59%9%
564
August1st to 15thNight
3427%53%10%
539
16th to endNight
4319%51%19%
744
September1st to 15thNight
28%28%45%14%
720
16th to endNight
2212%30%36%15%
716
October1st to 15thNight
2314%40%30%7%
720
16th to endNight
2314%29%36%13%
768
November1st to 15thNight
1117%36%31%9%
760
16th to endNight
3416%31%31%11%
780
December1st to 15thNight
7%317%36%28%7%
780
16th to endNight
9%5%18%33%25%7%
832
Page generated at 2018-03-12 10:28:15. Version ac04

Copyright 2018 A. Danko


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