Living Desert State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Living Desert State Park clear sky chart from 2005-11-06 to 2024-03-18.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	5% 3 1 3 3 2 3 4 5% 7% 64%	79216
	Night	5% 3 1 3 3 2 3 4 5% 7% 64%	80613
Transparency	Day	20% 4 8% 18% 26% 24%	78952
	Night	19% 4 8% 17% 26% 25%	80400
Seeing	Day	7% 7% 20% 31% 26% 9%	13941
	Night	6% 5% 25% 44% 19% 1	24203

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	4 5% 2 3 3 2 3 3 4 6% 65%	2825
	11th to 20th	Day	2 2 1 1 2 2 3 3 4 6% 75%	2860
	21st to end	Day	5% 4 2 5% 4 2 3 4 5% 8% 58%	3455
February	1st to 10th	Day	4 3 2 3 3 1 2 3 5% 5% 69%	1900
	11th to 20th	Day	5% 6% 2 4 3 2 3 3 5% 6% 61%	1849
	21st to end	Day	3 5% 2 3 3 2 2 3 4 7% 67%	1570
March	1st to 10th	Day	6% 4 3 3 3 2 3 3 5% 7% 60%	1900
	11th to 20th	Day	8% 4 1 3 4 1 3 3 5% 7% 61%	2014
	21st to end	Day	3 4 2 3 4 2 3 3 4 7% 65%	2336
April	1st to 10th	Day	3 2 1 2 3 1 4 4 4 7% 69%	2160
	11th to 20th	Day	6% 3 1 2 2 1 2 3 3 5% 71%	2131
	21st to end	Day	3 2 1 2 2 2 3 2 4 6% 74%	2160
May	1st to 10th	Day	4 2 1 2 3 2 3 3 4 7% 69%	2160
	11th to 20th	Day	7% 3 1 3 3 2 3 4 5% 6% 63%	2173
	21st to end	Day	5% 2 1 2 3 2 4 3 5% 7% 67%	2531
June	1st to 10th	Day	2 2 1 2 3 2 2 4 5% 8% 68%	2360
	11th to 20th	Day	2 2 1 2 3 2 4 4 5% 8% 69%	2520
	21st to end	Day	5% 2 2 3 4 2 3 4 6% 10% 61%	2520
July	1st to 10th	Day	5% 3 2 4 4 3 5% 5% 7% 10% 52%	2475
	11th to 20th	Day	5% 2 1 3 3 2 4 5% 7% 10% 57%	2339
	21st to end	Day	5% 2 2 3 4 2 4 5% 7% 10% 55%	2349
August	1st to 10th	Day	5% 1 1 3 3 3 4 5% 7% 11% 57%	2149
	11th to 20th	Day	5% 3 1 4 5% 3 6% 6% 8% 10% 49%	2123
	21st to end	Day	5% 3 2 4 5% 3 4 6% 8% 11% 50%	2376
September	1st to 10th	Day	9% 4 1 3 3 2 5% 4 7% 9% 54%	2160
	11th to 20th	Day	10% 4 1 5% 4 3 4 5% 6% 7% 52%	2080
	21st to end	Day	8% 2 1 3 3 2 2 2 4 7% 66%	1980
October	1st to 10th	Day	6% 3 1 3 3 2 3 3 4 6% 65%	1967
	11th to 20th	Day	7% 2 2 2 3 1 2 2 3 4 73%	1800
	21st to end	Day	5% 3 1 2 2 1 2 2 2 5% 75%	1980
November	1st to 10th	Day	6% 2 1 2 2 1 2 2 3 6% 72%	1757
	11th to 20th	Day	4 3 1 2 2 1 2 4 4 6% 69%	1710
	21st to end	Day	7% 4 1 2 2 2 3 4 5% 7% 64%	1710
December	1st to 10th	Day	7% 5% 2 4 3 2 3 3 4 6% 62%	1710
	11th to 20th	Day	3 4 1 4 3 2 5% 5% 6% 7% 61%	2161
	21st to end	Day	4 4 1 2 2 1 3 3 3 5% 71%	2966
January	1st to 10th	Night	4 4 1 3 2 2 3 3 4 6% 67%	4159
	11th to 20th	Night	3 3 1 2 2 1 2 3 3 7% 71%	4110
	21st to end	Night	5% 3 2 4 4 2 4 4 5% 7% 59%	4207
February	1st to 10th	Night	3 4 1 2 3 2 3 4 4 6% 68%	2280
	11th to 20th	Night	6% 4 2 4 4 2 3 3 5% 6% 63%	2218
	21st to end	Night	5% 4 2 3 3 2 4 3 5% 5% 65%	1884
March	1st to 10th	Night	7% 4 2 3 3 2 3 4 4 6% 62%	2280
	11th to 20th	Night	10% 3 2 2 3 2 3 4 5% 6% 61%	2107
	21st to end	Night	3 3 1 3 3 3 3 3 4 6% 69%	2017
April	1st to 10th	Night	3 3 2 3 3 1 3 4 4 7% 67%	1800
	11th to 20th	Night	5% 2 1 2 2 2 3 4 5% 6% 69%	1777
	21st to end	Night	3 1 1 2 2 2 2 3 3 5% 76%	1800
May	1st to 10th	Night	4 2 1 2 3 2 3 3 4 5% 71%	1800
	11th to 20th	Night	7% 3 2 2 2 1 3 3 4 6% 67%	1719
	21st to end	Night	5% 2 1 2 2 2 3 4 4 8% 68%	1745
June	1st to 10th	Night	3 1 1 3 4 2 6% 6% 7% 11% 57%	1594
	11th to 20th	Night	2 2 3 3 1 3 4 5% 7% 70%	1440
	21st to end	Night	4 2 1 3 4 2 5% 4 5% 10% 61%	1440
July	1st to 10th	Night	4 2 1 3 4 2 5% 5% 8% 11% 55%	1479
	11th to 20th	Night	2 2 2 3 4 3 5% 7% 9% 11% 53%	1620
	21st to end	Night	4 2 2 3 4 3 5% 5% 8% 13% 51%	1966
August	1st to 10th	Night	3 2 1 3 4 3 5% 6% 7% 13% 53%	1790
	11th to 20th	Night	4 2 2 4 3 3 4 7% 9% 13% 50%	1778
	21st to end	Night	4 3 2 3 5% 3 4 7% 7% 10% 52%	1980
September	1st to 10th	Night	8% 3 2 4 3 2 5% 5% 7% 8% 55%	1800
	11th to 20th	Night	8% 3 2 3 4 2 4 5% 6% 9% 53%	1877
	21st to end	Night	7% 3 1 2 3 2 2 5% 5% 7% 63%	1980
October	1st to 10th	Night	7% 3 1 2 3 2 3 3 4 6% 66%	1988
	11th to 20th	Night	8% 3 1 2 2 1 2 2 3 4 72%	2160
	21st to end	Night	6% 4 1 2 2 1 2 3 3 4 74%	2376
November	1st to 10th	Night	6% 1 1 2 2 1 3 3 3 5% 72%	2300
	11th to 20th	Night	3 3 1 2 3 1 3 3 4 6% 71%	2470
	21st to end	Night	6% 4 1 3 3 2 3 3 4 6% 66%	2470
December	1st to 10th	Night	8% 3 2 3 3 2 3 3 4 7% 61%	2470
	11th to 20th	Night	4 3 2 4 4 2 3 3 5% 7% 62%	3036
	21st to end	Night	4 3 1 3 3 2 3 3 3 5% 71%	4696

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	18% 3 7% 14% 34% 25%	2826
	11th to 20th	Day	12% 4 5% 17% 40% 22%	2860
	21st to end	Day	23% 5% 7% 21% 28% 16%	3455
February	1st to 10th	Day	18% 3 7% 15% 25% 32%	1900
	11th to 20th	Day	25% 3 5% 15% 23% 28%	1859
	21st to end	Day	19% 2 3 11% 26% 38%	1570
March	1st to 10th	Day	24% 3 4 12% 28% 28%	1900
	11th to 20th	Day	23% 2 6% 13% 25% 31%	2014
	21st to end	Day	20% 3 5% 13% 25% 33%	2336
April	1st to 10th	Day	17% 3 4 11% 28% 36%	2160
	11th to 20th	Day	17% 3 4 11% 24% 41%	2134
	21st to end	Day	13% 3 4 12% 28% 39%	2160
May	1st to 10th	Day	16% 3 4 12% 22% 44%	2160
	11th to 20th	Day	22% 5% 7% 14% 25% 29%	2176
	21st to end	Day	17% 4 9% 17% 17% 36%	2531
June	1st to 10th	Day	14% 5% 9% 22% 24% 25%	2360
	11th to 20th	Day	14% 4 6% 14% 23% 38%	2520
	21st to end	Day	20% 4 10% 18% 24% 23%	2520
July	1st to 10th	Day	24% 8% 14% 24% 22% 8%	2408
	11th to 20th	Day	18% 6% 14% 23% 26% 13%	2270
	21st to end	Day	19% 7% 16% 31% 22% 4	2219
August	1st to 10th	Day	18% 7% 13% 28% 28% 5%	2136
	11th to 20th	Day	25% 9% 16% 26% 19% 5%	2123
	21st to end	Day	25% 9% 15% 24% 19% 8%	2376
September	1st to 10th	Day	26% 6% 13% 19% 21% 15%	2160
	11th to 20th	Day	30% 7% 9% 19% 25% 11%	2080
	21st to end	Day	20% 4 7% 18% 32% 20%	1980
October	1st to 10th	Day	20% 4 10% 17% 24% 24%	1967
	11th to 20th	Day	19% 2 5% 13% 29% 32%	1800
	21st to end	Day	16% 2 4 17% 34% 28%	1980
November	1st to 10th	Day	17% 2 4 18% 30% 29%	1757
	11th to 20th	Day	17% 3 7% 16% 31% 26%	1710
	21st to end	Day	19% 4 6% 17% 29% 25%	1710
December	1st to 10th	Day	25% 3 6% 20% 28% 16%	1710
	11th to 20th	Day	22% 5% 8% 20% 25% 20%	2159
	21st to end	Day	17% 3 4 19% 33% 25%	2966
January	1st to 10th	Night	18% 3 5% 14% 39% 21%	4159
	11th to 20th	Night	15% 3 9% 16% 33% 25%	4110
	21st to end	Night	23% 5% 5% 21% 28% 17%	4207
February	1st to 10th	Night	17% 3 7% 15% 24% 34%	2280
	11th to 20th	Night	23% 3 6% 12% 25% 31%	2218
	21st to end	Night	20% 3 4 9% 21% 42%	1884
March	1st to 10th	Night	23% 4 5% 12% 23% 33%	2280
	11th to 20th	Night	25% 4 4 13% 25% 29%	2107
	21st to end	Night	17% 3 6% 15% 24% 36%	2017
April	1st to 10th	Night	19% 4 5% 12% 22% 40%	1800
	11th to 20th	Night	16% 4 7% 13% 20% 40%	1777
	21st to end	Night	13% 3 4 14% 27% 38%	1800
May	1st to 10th	Night	17% 3 5% 11% 20% 45%	1800
	11th to 20th	Night	20% 4 8% 16% 22% 29%	1720
	21st to end	Night	17% 6% 10% 16% 18% 34%	1746
June	1st to 10th	Night	19% 7% 11% 20% 22% 22%	1594
	11th to 20th	Night	13% 5% 8% 14% 24% 36%	1440
	21st to end	Night	18% 6% 14% 20% 21% 21%	1440
July	1st to 10th	Night	21% 7% 17% 28% 21% 6%	1437
	11th to 20th	Night	19% 8% 16% 21% 25% 11%	1566
	21st to end	Night	22% 8% 14% 30% 22% 5%	1857
August	1st to 10th	Night	20% 6% 12% 29% 26% 7%	1779
	11th to 20th	Night	21% 8% 18% 28% 18% 7%	1778
	21st to end	Night	25% 8% 14% 25% 19% 9%	1980
September	1st to 10th	Night	25% 7% 12% 18% 19% 17%	1800
	11th to 20th	Night	25% 7% 13% 20% 22% 13%	1877
	21st to end	Night	20% 4 11% 17% 28% 21%	1980
October	1st to 10th	Night	21% 4 9% 15% 25% 26%	1988
	11th to 20th	Night	18% 2 5% 13% 28% 34%	2160
	21st to end	Night	17% 2 4 14% 30% 33%	2376
November	1st to 10th	Night	15% 3 5% 15% 31% 32%	2300
	11th to 20th	Night	16% 3 5% 16% 30% 30%	2470
	21st to end	Night	21% 3 5% 16% 29% 27%	2470
December	1st to 10th	Night	24% 3 5% 19% 26% 23%	2470
	11th to 20th	Night	21% 3 6% 20% 29% 21%	3037
	21st to end	Night	17% 3 4 15% 36% 26%	4696

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	12% 9% 27% 37% 13% 1	270
	11th to 20th	Day	11% 6% 30% 37% 14% 1	270
	21st to end	Day	6% 8% 32% 35% 16% 3	297
February	1st to 10th	Day	8% 10% 30% 33% 16% 3	270
	11th to 20th	Day	15% 8% 32% 33% 10% 2	270
	21st to end	Day	10% 13% 37% 26% 13% 1	225
March	1st to 10th	Day	11% 8% 36% 30% 12% 3	270
	11th to 20th	Day	18% 10% 30% 29% 11% 2	405
	21st to end	Day	8% 18% 36% 26% 12%	462
April	1st to 10th	Day	7% 14% 39% 29% 12%	420
	11th to 20th	Day	6% 20% 38% 25% 9% 2	412
	21st to end	Day	7% 18% 35% 25% 14% 1	420
May	1st to 10th	Day	5% 12% 37% 30% 14% 2	423
	11th to 20th	Day	5% 7% 29% 34% 21% 4	496
	21st to end	Day	5% 5% 27% 41% 20% 2	679
June	1st to 10th	Day	4 3 17% 43% 27% 7%	630
	11th to 20th	Day	2 3 17% 39% 32% 6%	630
	21st to end	Day	4 1 12% 37% 37% 8%	630
July	1st to 10th	Day	5% 2 4 31% 43% 15%	578
	11th to 20th	Day	2 2 2 27% 44% 23%	444
	21st to end	Day	2 1 4 28% 42% 24%	487
August	1st to 10th	Day	3 1 3 23% 45% 25%	447
	11th to 20th	Day	6% 3 3 25% 39% 24%	437
	21st to end	Day	5% 1 5% 23% 42% 24%	495
September	1st to 10th	Day	9% 3 5% 26% 40% 16%	450
	11th to 20th	Day	6% 1 5% 30% 43% 15%	370
	21st to end	Day	11% 1 10% 22% 38% 17%	270
October	1st to 10th	Day	9% 4 10% 33% 34% 9%	270
	11th to 20th	Day	9% 3 19% 31% 27% 12%	270
	21st to end	Day	12% 6% 19% 26% 26% 10%	297
November	1st to 10th	Day	12% 7% 17% 34% 23% 6%	270
	11th to 20th	Day	8% 9% 20% 33% 24% 7%	270
	21st to end	Day	13% 12% 28% 29% 14% 4	270
December	1st to 10th	Day	15% 9% 20% 30% 21% 4	270
	11th to 20th	Day	6% 11% 23% 41% 18% 1	270
	21st to end	Day	14% 10% 24% 37% 15%	297
January	1st to 10th	Night	10% 5% 29% 44% 12% 1	796
	11th to 20th	Night	8% 7% 27% 44% 13% 1	760
	21st to end	Night	6% 6% 31% 46% 10%	836
February	1st to 10th	Night	5% 8% 33% 42% 12%	760
	11th to 20th	Night	8% 6% 38% 41% 6% 1	744
	21st to end	Night	9% 7% 46% 35% 3	628
March	1st to 10th	Night	9% 6% 37% 41% 6%	760
	11th to 20th	Night	11% 7% 31% 40% 11%	752
	21st to end	Night	5% 7% 44% 39% 5%	631
April	1st to 10th	Night	6% 8% 42% 41% 4	540
	11th to 20th	Night	6% 9% 43% 39% 3	533
	21st to end	Night	3 9% 45% 36% 7%	540
May	1st to 10th	Night	4 4 41% 45% 6%	540
	11th to 20th	Night	8% 4 28% 47% 14%	531
	21st to end	Night	5% 3 33% 51% 9%	584
June	1st to 10th	Night	3 3 27% 51% 16%	540
	11th to 20th	Night	2 1 28% 56% 13%	540
	21st to end	Night	3 2 19% 51% 24%	540
July	1st to 10th	Night	5% 12% 49% 31% 3	525
	11th to 20th	Night	2 1 7% 50% 39% 2	522
	21st to end	Night	4 2 5% 40% 45% 3	591
August	1st to 10th	Night	2 1 3 36% 55% 2	537
	11th to 20th	Night	3 2 4 34% 55% 2	534
	21st to end	Night	4 1 4 37% 51% 3	594
September	1st to 10th	Night	7% 1 6% 44% 39% 3	540
	11th to 20th	Night	9% 2 5% 44% 39% 1	540
	21st to end	Night	7% 2 11% 46% 33% 2	540
October	1st to 10th	Night	7% 2 18% 51% 20% 1	548
	11th to 20th	Night	9% 3 19% 47% 21% 1	720
	21st to end	Night	8% 3 19% 42% 27% 2	792
November	1st to 10th	Night	7% 2 20% 45% 25% 1	820
	11th to 20th	Night	4 5% 22% 47% 20% 2	950
	21st to end	Night	8% 6% 27% 40% 18% 1	950
December	1st to 10th	Night	10% 4 26% 44% 15%	950
	11th to 20th	Night	7% 7% 30% 46% 10% 1	950
	21st to end	Night	7% 9% 29% 43% 12%	1045

Page generated at 2024-03-15 12:01:41. Version ac07

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