Dinosaur Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dinosaur Point clear sky chart from 2005-11-06 to 2024-01-13.

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 3 4 7% 66%	74719
	Night	6% 3 1 3 3 2 3 4 5% 8% 63%	75024
Transparency	Day	20% 6% 9% 18% 25% 22%	74436
	Night	21% 8% 10% 18% 23% 20%	74828
Seeing	Day	6% 8% 23% 32% 23% 8%	14244
	Night	6% 5% 18% 37% 28% 7%	23769

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	13% 7% 4 6% 7% 3 5% 5% 5% 8% 37%	1571
	11th to 20th	Day	7% 5% 2 5% 5% 3 4 5% 6% 8% 50%	1639
	21st to end	Day	11% 5% 2 5% 6% 3 5% 6% 7% 8% 44%	1782
February	1st to 10th	Day	11% 5% 2 4 4 2 4 5% 6% 7% 50%	1620
	11th to 20th	Day	8% 4 1 5% 4 2 5% 4 6% 9% 51%	1728
	21st to end	Day	11% 4 2 4 4 3 4 5% 5% 6% 51%	1480
March	1st to 10th	Day	8% 5% 3 6% 5% 4 5% 6% 7% 9% 42%	1876
	11th to 20th	Day	10% 4 2 5% 5% 4 5% 5% 7% 9% 44%	1980
	21st to end	Day	7% 4 2 5% 5% 3 5% 5% 6% 7% 51%	2254
April	1st to 10th	Day	8% 5% 3 4 5% 3 4 5% 5% 7% 52%	2160
	11th to 20th	Day	5% 3 1 3 4 2 3 4 5% 7% 62%	2129
	21st to end	Day	4 2 1 2 3 2 3 4 4 6% 68%	2160
May	1st to 10th	Day	2 1 1 2 3 2 3 4 4 10% 68%	2160
	11th to 20th	Day	2 1 1 2 2 2 3 3 4 9% 71%	2366
	21st to end	Day	2 1 1 1 2 2 3 4 5% 9% 71%	2723
June	1st to 10th	Day	2 1 1 3 2 1 2 3 3 8% 73%	2520
	11th to 20th	Day	1 1 1 1 2 3 6% 84%	2520
	21st to end	Day	1 1 1 1 1 2 2 2 4 85%	2520
July	1st to 10th	Day	1 1 1 1 2 2 5% 88%	2520
	11th to 20th	Day	1 1 1 1 1 1 2 3 5% 84%	2418
	21st to end	Day	1 1 1 1 1 2 2 2 5% 84%	2546
August	1st to 10th	Day	1 1 1 1 1 2 2 3 5% 83%	2320
	11th to 20th	Day	1 1 1 1 1 2 2 5% 87%	2122
	21st to end	Day	1 1 1 1 1 2 2 5% 86%	2376
September	1st to 10th	Day	1 1 1 1 1 1 1 2 3 89%	2160
	11th to 20th	Day	1 1 1 1 1 2 4 7% 82%	2160
	21st to end	Day	1 1 1 2 1 2 2 3 6% 81%	1947
October	1st to 10th	Day	2 1 1 2 2 2 3 3 5% 6% 75%	1800
	11th to 20th	Day	3 2 1 2 2 2 3 3 4 6% 74%	1800
	21st to end	Day	3 2 1 3 3 2 3 4 5% 7% 68%	1980
November	1st to 10th	Day	5% 3 2 3 4 2 5% 4 5% 8% 58%	1768
	11th to 20th	Day	5% 4 2 4 3 2 4 3 6% 8% 59%	1710
	21st to end	Day	7% 3 2 3 3 3 4 4 5% 8% 57%	1662
December	1st to 10th	Day	8% 6% 2 5% 6% 3 4 5% 6% 8% 47%	1520
	11th to 20th	Day	19% 9% 4 8% 5% 3 3 4 6% 6% 33%	1928
	21st to end	Day	9% 8% 3 6% 7% 4 5% 5% 6% 7% 39%	2794
January	1st to 10th	Night	11% 6% 3 5% 5% 3 4 5% 7% 9% 42%	2589
	11th to 20th	Night	8% 5% 3 6% 4 3 4 5% 5% 7% 51%	2366
	21st to end	Night	11% 4 2 4 4 2 4 5% 5% 8% 50%	2574
February	1st to 10th	Night	11% 4 2 4 4 2 4 4 5% 6% 55%	2340
	11th to 20th	Night	7% 3 1 3 4 3 5% 5% 6% 10% 55%	2120
	21st to end	Night	9% 4 2 4 3 2 4 4 3 8% 58%	1776
March	1st to 10th	Night	9% 5% 2 4 5% 4 5% 6% 5% 7% 48%	2080
	11th to 20th	Night	8% 4 2 4 5% 4 6% 5% 6% 9% 48%	1980
	21st to end	Night	8% 4 3 3 3 2 3 4 5% 8% 56%	2102
April	1st to 10th	Night	7% 3 2 3 4 2 5% 5% 7% 7% 55%	1800
	11th to 20th	Night	4 3 1 4 3 2 3 3 5% 7% 64%	1779
	21st to end	Night	3 1 1 2 2 2 3 3 5% 10% 70%	1800
May	1st to 10th	Night	2 2 1 2 4 2 3 2 6% 10% 67%	1800
	11th to 20th	Night	2 2 1 2 1 3 4 5% 11% 70%	1520
	21st to end	Night	2 2 1 1 1 1 2 3 5% 10% 73%	1552
June	1st to 10th	Night	1 2 1 2 2 2 3 3 4 9% 71%	1440
	11th to 20th	Night	1 1 1 1 1 2 4 7% 82%	1440
	21st to end	Night	1 1 1 2 3 7% 86%	1440
July	1st to 10th	Night	1 2 2 2 8% 85%	1440
	11th to 20th	Night	1 1 1 1 1 2 2 3 7% 83%	1538
	21st to end	Night	1 1 1 1 1 2 3 5% 7% 78%	1773
August	1st to 10th	Night	1 1 1 1 1 1 1 2 3 10% 78%	1619
	11th to 20th	Night	1 2 1 1 2 4 8% 80%	1780
	21st to end	Night	1 1 1 1 1 1 3 8% 83%	1980
September	1st to 10th	Night	1 1 1 1 1 1 1 3 6% 84%	1800
	11th to 20th	Night	2 1 1 1 1 1 1 2 3 8% 80%	1800
	21st to end	Night	2 1 1 2 1 2 3 2 6% 80%	2007
October	1st to 10th	Night	4 1 1 2 2 1 3 3 4 7% 73%	2160
	11th to 20th	Night	2 2 1 2 2 2 3 3 4 8% 71%	2160
	21st to end	Night	3 2 1 1 2 1 2 4 5% 8% 72%	2376
November	1st to 10th	Night	4 2 1 2 2 2 3 4 5% 9% 65%	2310
	11th to 20th	Night	6% 3 1 3 3 2 3 3 5% 9% 60%	2470
	21st to end	Night	5% 3 1 4 5% 2 3 4 4 7% 61%	2515
December	1st to 10th	Night	10% 5% 2 6% 4 2 4 3 5% 7% 52%	2660
	11th to 20th	Night	15% 7% 3 7% 6% 3 5% 5% 6% 7% 36%	3276
	21st to end	Night	14% 6% 2 5% 5% 3 5% 6% 6% 9% 39%	4862

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	43% 9% 13% 22% 10% 4	1571
	11th to 20th	Day	31% 9% 13% 19% 19% 10%	1639
	21st to end	Day	39% 7% 12% 14% 22% 5%	1782
February	1st to 10th	Day	34% 6% 9% 22% 19% 11%	1620
	11th to 20th	Day	31% 8% 11% 20% 23% 7%	1738
	21st to end	Day	35% 8% 10% 21% 20% 6%	1480
March	1st to 10th	Day	39% 10% 11% 18% 17% 4	1876
	11th to 20th	Day	36% 9% 11% 21% 18% 4	1980
	21st to end	Day	32% 10% 16% 20% 17% 5%	2254
April	1st to 10th	Day	32% 8% 12% 21% 19% 7%	2160
	11th to 20th	Day	24% 6% 13% 25% 24% 8%	2132
	21st to end	Day	19% 8% 12% 28% 28% 6%	2160
May	1st to 10th	Day	15% 8% 11% 25% 32% 9%	2160
	11th to 20th	Day	12% 7% 10% 26% 33% 11%	2369
	21st to end	Day	13% 9% 14% 27% 29% 7%	2724
June	1st to 10th	Day	12% 8% 12% 23% 28% 17%	2520
	11th to 20th	Day	5% 4 8% 20% 34% 29%	2520
	21st to end	Day	7% 2 3 10% 30% 47%	2520
July	1st to 10th	Day	4 2 3 9% 22% 61%	2451
	11th to 20th	Day	6% 3 4 9% 22% 56%	2344
	21st to end	Day	5% 2 3 9% 26% 55%	2405
August	1st to 10th	Day	7% 3 4 11% 26% 49%	2304
	11th to 20th	Day	4 2 3 11% 31% 50%	2122
	21st to end	Day	4 2 3 11% 33% 48%	2376
September	1st to 10th	Day	5% 3 3 8% 28% 53%	2160
	11th to 20th	Day	4 5% 7% 19% 38% 26%	2160
	21st to end	Day	8% 3 5% 20% 40% 25%	1947
October	1st to 10th	Day	12% 4 9% 18% 27% 30%	1800
	11th to 20th	Day	14% 5% 8% 21% 25% 27%	1800
	21st to end	Day	16% 4 9% 20% 27% 23%	1980
November	1st to 10th	Day	24% 7% 12% 19% 24% 14%	1768
	11th to 20th	Day	24% 7% 11% 25% 25% 7%	1710
	21st to end	Day	26% 6% 12% 18% 28% 11%	1662
December	1st to 10th	Day	34% 8% 12% 18% 17% 11%	1520
	11th to 20th	Day	49% 9% 9% 15% 13% 5%	1928
	21st to end	Day	41% 11% 14% 20% 11% 3	2794
January	1st to 10th	Night	36% 10% 13% 22% 14% 4	2589
	11th to 20th	Night	32% 9% 12% 19% 16% 12%	2366
	21st to end	Night	34% 8% 14% 13% 22% 9%	2574
February	1st to 10th	Night	31% 6% 9% 21% 22% 12%	2340
	11th to 20th	Night	25% 9% 13% 19% 24% 9%	2121
	21st to end	Night	28% 8% 12% 27% 18% 7%	1776
March	1st to 10th	Night	35% 11% 15% 16% 17% 6%	2080
	11th to 20th	Night	32% 10% 12% 19% 20% 7%	1980
	21st to end	Night	27% 11% 14% 23% 18% 8%	2102
April	1st to 10th	Night	27% 10% 16% 22% 18% 8%	1800
	11th to 20th	Night	21% 8% 14% 26% 22% 9%	1779
	21st to end	Night	14% 10% 15% 27% 27% 7%	1800
May	1st to 10th	Night	15% 9% 12% 22% 29% 14%	1800
	11th to 20th	Night	12% 8% 13% 22% 33% 12%	1520
	21st to end	Night	10% 11% 18% 24% 29% 8%	1552
June	1st to 10th	Night	13% 8% 11% 19% 31% 17%	1440
	11th to 20th	Night	6% 5% 8% 17% 32% 32%	1440
	21st to end	Night	4 4 7% 11% 29% 46%	1440
July	1st to 10th	Night	3 3 6% 9% 19% 60%	1400
	11th to 20th	Night	5% 3 4 11% 23% 53%	1489
	21st to end	Night	6% 3 6% 9% 23% 53%	1674
August	1st to 10th	Night	7% 4 7% 13% 23% 46%	1610
	11th to 20th	Night	6% 3 4 11% 28% 49%	1780
	21st to end	Night	4 3 5% 12% 28% 49%	1980
September	1st to 10th	Night	5% 4 4 7% 22% 58%	1800
	11th to 20th	Night	7% 6% 6% 17% 33% 32%	1800
	21st to end	Night	8% 4 6% 15% 36% 30%	2007
October	1st to 10th	Night	14% 6% 8% 16% 23% 33%	2160
	11th to 20th	Night	13% 7% 8% 19% 25% 29%	2160
	21st to end	Night	12% 6% 7% 21% 27% 26%	2376
November	1st to 10th	Night	17% 8% 11% 21% 24% 18%	2310
	11th to 20th	Night	23% 7% 12% 20% 30% 9%	2470
	21st to end	Night	24% 7% 10% 18% 27% 14%	2515
December	1st to 10th	Night	31% 8% 11% 20% 18% 12%	2660
	11th to 20th	Night	44% 12% 11% 14% 15% 4	3276
	21st to end	Night	40% 14% 14% 17% 11% 4	4862

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	20% 12% 26% 24% 15% 3	232
	11th to 20th	Day	12% 7% 22% 27% 24% 6%	347
	21st to end	Day	9% 10% 20% 29% 27% 5%	374
February	1st to 10th	Day	14% 13% 17% 24% 24% 7%	340
	11th to 20th	Day	10% 15% 24% 30% 19% 3	405
	21st to end	Day	11% 15% 22% 32% 18% 2	346
March	1st to 10th	Day	15% 14% 25% 30% 13% 3	420
	11th to 20th	Day	15% 14% 23% 24% 18% 6%	420
	21st to end	Day	13% 16% 26% 28% 15% 2	462
April	1st to 10th	Day	11% 13% 30% 22% 18% 5%	420
	11th to 20th	Day	8% 16% 32% 27% 13% 4	412
	21st to end	Day	3 15% 34% 24% 15% 9%	420
May	1st to 10th	Day	4 13% 33% 30% 16% 5%	423
	11th to 20th	Day	3 13% 35% 30% 16% 3	448
	21st to end	Day	3 13% 28% 34% 16% 7%	485
June	1st to 10th	Day	3 9% 31% 34% 14% 9%	450
	11th to 20th	Day	2 10% 30% 32% 22% 4	450
	21st to end	Day	1 6% 26% 35% 25% 6%	450
July	1st to 10th	Day	1 2 24% 45% 22% 7%	446
	11th to 20th	Day	1 1 22% 40% 29% 8%	444
	21st to end	Day	1 1 19% 43% 25% 12%	487
August	1st to 10th	Day	2 5% 25% 40% 22% 6%	447
	11th to 20th	Day	1 2 21% 38% 27% 11%	437
	21st to end	Day	2 15% 40% 30% 13%	495
September	1st to 10th	Day	1 4 17% 36% 27% 15%	450
	11th to 20th	Day	2 5% 25% 33% 25% 11%	450
	21st to end	Day	2 4 17% 31% 33% 13%	450
October	1st to 10th	Day	2 7% 21% 27% 30% 12%	450
	11th to 20th	Day	3 6% 16% 29% 32% 15%	450
	21st to end	Day	5% 6% 17% 26% 33% 14%	495
November	1st to 10th	Day	6% 6% 17% 23% 37% 10%	364
	11th to 20th	Day	4 4 16% 32% 34% 10%	270
	21st to end	Day	8% 3 17% 36% 34% 2	247
December	1st to 10th	Day	14% 8% 22% 27% 24% 5%	180
	11th to 20th	Day	12% 9% 23% 27% 23% 6%	180
	21st to end	Day	12% 13% 21% 29% 20% 5%	198
January	1st to 10th	Night	13% 6% 13% 37% 24% 8%	760
	11th to 20th	Night	10% 5% 11% 39% 27% 8%	728
	21st to end	Night	13% 5% 13% 36% 27% 7%	792
February	1st to 10th	Night	13% 5% 13% 35% 26% 8%	720
	11th to 20th	Night	9% 5% 18% 36% 25% 7%	704
	21st to end	Night	11% 8% 18% 40% 20% 3	592
March	1st to 10th	Night	11% 10% 21% 33% 21% 5%	720
	11th to 20th	Night	9% 8% 19% 35% 24% 5%	720
	21st to end	Night	9% 7% 26% 35% 19% 3	792
April	1st to 10th	Night	9% 7% 23% 36% 22% 4	720
	11th to 20th	Night	5% 11% 28% 32% 19% 5%	711
	21st to end	Night	4 7% 29% 32% 22% 5%	720
May	1st to 10th	Night	2 7% 28% 39% 20% 4	720
	11th to 20th	Night	3 5% 27% 42% 20% 2	458
	21st to end	Night	3 7% 29% 39% 21% 1	389
June	1st to 10th	Night	1 4 28% 44% 20% 2	360
	11th to 20th	Night	1 4 26% 46% 22% 2	360
	21st to end	Night	1 3 19% 49% 27% 2	360
July	1st to 10th	Night	2 21% 43% 31% 2	350
	11th to 20th	Night	1 12% 46% 34% 7%	445
	21st to end	Night	1 15% 41% 36% 7%	591
August	1st to 10th	Night	1 1 16% 45% 31% 5%	545
	11th to 20th	Night	1 19% 44% 29% 6%	712
	21st to end	Night	1 1 13% 41% 38% 7%	792
September	1st to 10th	Night	1 2 14% 36% 39% 8%	720
	11th to 20th	Night	2 2 18% 41% 30% 7%	720
	21st to end	Night	3 3 13% 35% 36% 11%	720
October	1st to 10th	Night	3 3 13% 38% 33% 10%	720
	11th to 20th	Night	3 3 13% 35% 34% 12%	720
	21st to end	Night	4 3 13% 32% 30% 18%	792
November	1st to 10th	Night	4 4 14% 33% 33% 12%	740
	11th to 20th	Night	7% 3 10% 36% 35% 9%	760
	21st to end	Night	5% 3 15% 36% 31% 9%	760
December	1st to 10th	Night	12% 5% 12% 38% 26% 7%	760
	11th to 20th	Night	15% 5% 12% 38% 26% 4	760
	21st to end	Night	13% 8% 17% 35% 23% 3	836

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