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 2017-03-19.

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%
15204
36%
45221
29%
15167
76%
15167
54%
21308

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
64%
717
33%
2327
29%
716
73%
716
46%
1118
January16th to endNight
60%
768
34%
2496
30%
768
70%
768
41%
1264
February1st to 15thNight
66%
698
36%
2118
29%
698
77%
698
51%
1029
February16th to endNight
58%
632
34%
1895
33%
632
64%
632
45%
981
March1st to 15thNight
64%
720
35%
2055
29%
720
72%
720
52%
1014
March16th to endNight
67%
720
34%
1980
25%
720
74%
720
56%
958
April1st to 15thNight
54%
659
32%
1745
17%
659
64%
659
50%
901
April16th to endNight
64%
542
41%
1532
23%
542
76%
542
65%
672
May1st to 15thNight
65%
494
39%
1484
26%
494
73%
494
65%
620
May16th to endNight
64%
513
34%
1541
24%
513
70%
513
63%
653
June1st to 15thNight
74%
495
35%
1485
30%
495
77%
495
70%
603
June16th to endNight
80%
495
33%
1485
29%
495
82%
495
76%
579
July1st to 15thNight
82%
465
26%
1395
24%
465
82%
465
50%
698
July16th to endNight
81%
522
28%
1467
25%
489
83%
489
46%
765
August1st to 15thNight
84%
494
39%
1476
32%
491
85%
491
57%
683
August16th to endNight
84%
682
38%
1732
27%
682
84%
682
57%
905
September1st to 15thNight
80%
660
32%
1807
27%
660
81%
660
55%
923
September16th to endNight
79%
656
43%
1815
34%
656
86%
656
75%
768
October1st to 15thNight
75%
660
42%
1831
32%
660
82%
660
63%
839
October16th to endNight
74%
704
43%
2112
37%
704
81%
704
64%
903
November1st to 15thNight
73%
700
38%
2267
34%
700
82%
700
59%
967
November16th to endNight
69%
720
40%
2340
37%
720
78%
720
56%
1006
December1st to 15thNight
66%
720
34%
2340
31%
720
74%
720
44%
1148
December16th to endNight
57%
768
34%
2496
31%
768
65%
768
38%
1311

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%
45597
Night
3213313345%67%
45416
TransparencyDay
18%36%13%26%32%
45292
Night
17%36%14%28%31%
45222
SeeingDay
413%31%34%13%2
4861
Night
4416%33%32%9%
15216

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
3423322346%63%
1611
16th to endDay
5%313423346%59%
1728
February1st to 15thDay
3413423347%62%
1742
16th to endDay
7%423434346%54%
1579
March1st to 15thDay
231331235%6%66%
1905
16th to endDay
3212323447%64%
1974
April1st to 15thDay
2214323346%64%
1870
16th to endDay
1112223225%74%
2095
May1st to 15thDay
1112322345%72%
2136
16th to endDay
2212212235%73%
2221
June1st to 15thDay
1111212381%
2145
16th to endDay
111222282%
2145
July1st to 15thDay
22124245%46%62%
2145
16th to endDay
3335%5%26%7%6%8%47%
2285
August1st to 15thDay
22135%245%5%7%59%
2145
16th to endDay
22135%2445%7%60%
2116
September1st to 15thDay
2213435%46%6%60%
1823
16th to endDay
11211222477%
1815
October1st to 15thDay
2112213445%69%
1798
16th to endDay
112211335%74%
1760
November1st to 15thDay
1212223236%71%
1591
16th to endDay
3212213335%70%
1620
December1st to 15thDay
35%145%2345%7%55%
1620
16th to endDay
8%5%1341235%6%56%
1728
January1st to 15thNight
3323423345%63%
2327
16th to endNight
5%423423345%60%
2496
February1st to 15thNight
3313323337%65%
2107
16th to endNight
5%42431335%7%58%
1895
March1st to 15thNight
221332435%7%63%
2055
16th to endNight
1112323346%67%
1980
April1st to 15thNight
2213423225%68%
1745
16th to endNight
1112112236%76%
1532
May1st to 15thNight
11222245%75%
1484
16th to endNight
11321223475%
1540
June1st to 15thNight
221222479%
1485
16th to endNight
121223382%
1485
July1st to 15thNight
211332445%7%61%
1485
16th to endNight
3223425%5%7%8%52%
1575
August1st to 15thNight
322212448%66%
1485
16th to endNight
321322335%7%64%
1732
September1st to 15thNight
224314346%65%
1807
16th to endNight
1111112481%
1815
October1st to 15thNight
212213235%73%
1831
16th to endNight
1211211235%75%
2112
November1st to 15thNight
2212312335%71%
2267
16th to endNight
322213335%71%
2340
December1st to 15thNight
431332435%5%61%
2340
16th to endNight
7%414414346%57%
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
21%35%17%31%21%
1612
16th to endDay
25%26%16%31%17%
1728
February1st to 15thDay
22%27%15%27%24%
1742
16th to endDay
29%26%13%28%18%
1579
March1st to 15thDay
17%25%13%35%24%
1905
16th to endDay
17%46%17%32%22%
1974
April1st to 15thDay
18%27%13%28%29%
1870
16th to endDay
13%1413%30%36%
2095
May1st to 15thDay
12%2411%30%37%
2136
16th to endDay
14%15%8%31%37%
2224
June1st to 15thDay
9%136%16%63%
2145
16th to endDay
8%13313%69%
2145
July1st to 15thDay
20%5%5%10%15%41%
2006
16th to endDay
27%6%10%17%16%20%
2130
August1st to 15thDay
21%5%7%13%22%30%
2130
16th to endDay
21%5%7%11%28%25%
2116
September1st to 15thDay
20%47%14%23%29%
1823
16th to endDay
11%228%27%47%
1815
October1st to 15thDay
15%35%11%28%35%
1798
16th to endDay
12%25%11%29%39%
1760
November1st to 15thDay
14%25%15%32%29%
1591
16th to endDay
15%35%16%27%31%
1620
December1st to 15thDay
25%47%20%22%17%
1620
16th to endDay
26%5%7%21%24%14%
1728
January1st to 15thNight
21%35%16%34%18%
2327
16th to endNight
25%36%17%25%22%
2496
February1st to 15thNight
19%37%18%24%26%
2118
16th to endNight
23%37%14%32%18%
1895
March1st to 15thNight
18%37%12%35%22%
2055
16th to endNight
16%38%16%32%23%
1980
April1st to 15thNight
19%25%13%34%24%
1745
16th to endNight
10%2312%34%36%
1532
May1st to 15thNight
10%25%12%33%35%
1485
16th to endNight
12%16%9%35%35%
1541
June1st to 15thNight
9%136%18%60%
1485
16th to endNight
7%135%13%69%
1485
July1st to 15thNight
19%5%6%11%13%42%
1395
16th to endNight
21%6%11%19%21%19%
1467
August1st to 15thNight
16%36%14%27%32%
1476
16th to endNight
18%35%15%28%28%
1732
September1st to 15thNight
19%38%15%20%32%
1807
16th to endNight
8%138%25%52%
1815
October1st to 15thNight
13%25%12%28%37%
1831
16th to endNight
12%15%11%24%44%
2112
November1st to 15thNight
14%2414%35%28%
2267
16th to endNight
15%25%15%28%33%
2340
December1st to 15thNight
21%47%18%27%20%
2340
16th to endNight
27%48%19%27%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
17%14%27%30%7%2
90
16th to endDay
9%9%25%27%16%12%
96
February1st to 15thDay
7%17%32%27%13%2
257
16th to endDay
9%24%36%18%10%
238
March1st to 15thDay
5%20%33%27%11%2
270
16th to endDay
222%37%24%9%3
238
April1st to 15thDay
10%32%29%22%41
209
16th to endDay
434%34%21%31
210
May1st to 15thDay
421%35%28%8%1
228
16th to endDay
418%39%27%7%1
266
June1st to 15thDay
113%41%34%6%2
255
16th to endDay
15%34%44%10%3
255
July1st to 15thDay
3130%50%13%
245
16th to endDay
3116%51%23%4
271
August1st to 15thDay
3227%46%16%4
255
16th to endDay
2123%49%19%4
268
September1st to 15thDay
25%34%42%11%2
255
16th to endDay
311%27%38%15%3
255
October1st to 15thDay
417%34%27%12%4
238
16th to endDay
29%19%36%29%3
96
November1st to 15thDay
35%18%32%32%7%
90
16th to endDay
417%33%26%17%
90
December1st to 15thDay
16%28%36%24%2
90
16th to endDay
11%11%25%37%13%1
96
January1st to 15thNight
35%19%36%23%10%
720
16th to endNight
9%418%34%25%7%
768
February1st to 15thNight
5%319%38%26%6%
704
16th to endNight
8%5%22%38%19%5%
632
March1st to 15thNight
47%20%36%27%5%
720
16th to endNight
36%17%39%26%7%
720
April1st to 15thNight
311%24%33%21%5%
659
16th to endNight
17%23%37%23%5%
542
May1st to 15thNight
15%23%34%29%4
495
16th to endNight
26%23%35%26%6%
515
June1st to 15thNight
318%41%30%5%
495
16th to endNight
1112%36%40%7%
495
July1st to 15thNight
45%29%50%9%
465
16th to endNight
4322%59%9%
522
August1st to 15thNight
3427%54%10%
494
16th to endNight
4320%51%18%
682
September1st to 15thNight
38%29%44%13%
660
16th to endNight
2212%30%35%16%
656
October1st to 15thNight
2315%40%30%8%
660
16th to endNight
2315%30%35%12%
704
November1st to 15thNight
2217%34%32%10%
700
16th to endNight
3417%31%30%12%
720
December1st to 15thNight
8%316%36%27%8%
720
16th to endNight
10%5%20%33%23%7%
768
Page generated at 2017-03-20 05:18:33. Version ac04

Copyright 2017 A. Danko


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