Newman Vista Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Newman Vista Point clear sky chart from 2005-11-06 to 2024-02-25.

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 5% 67%	78572
	Night	7% 3 1 3 3 2 3 3 4 6% 65%	80749
Transparency	Day	20% 6% 10% 19% 24% 21%	78288
	Night	22% 6% 11% 19% 23% 19%	80554
Seeing	Day	5% 6% 18% 30% 30% 11%	14350
	Night	6% 4 16% 39% 30% 5%	23896

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	11% 9% 4 7% 6% 3 5% 4 4 7% 39%	2585
	11th to 20th	Day	11% 8% 4 8% 7% 4 6% 4 4 7% 36%	2860
	21st to end	Day	17% 8% 3 6% 6% 3 4 5% 5% 7% 36%	3146
February	1st to 10th	Day	12% 5% 2 5% 4 2 4 5% 6% 7% 49%	1710
	11th to 20th	Day	8% 5% 2 4 4 3 5% 4 4 8% 53%	1824
	21st to end	Day	11% 4 2 4 4 2 4 3 5% 5% 55%	1521
March	1st to 10th	Day	9% 6% 2 5% 5% 3 5% 4 6% 8% 46%	1870
	11th to 20th	Day	10% 5% 2 4 4 3 5% 5% 6% 8% 48%	1980
	21st to end	Day	8% 4 2 4 4 3 4 4 5% 7% 54%	2257
April	1st to 10th	Day	8% 5% 3 4 4 2 4 4 5% 6% 54%	2160
	11th to 20th	Day	5% 3 1 4 3 2 3 4 5% 6% 64%	2129
	21st to end	Day	5% 3 1 2 3 2 3 3 4 6% 70%	2160
May	1st to 10th	Day	2 2 1 3 2 2 3 3 4 7% 71%	2160
	11th to 20th	Day	2 2 1 2 2 1 2 3 4 5% 75%	2389
	21st to end	Day	2 2 1 2 3 1 3 3 4 6% 74%	2723
June	1st to 10th	Day	2 2 1 2 2 1 3 3 3 6% 75%	2520
	11th to 20th	Day	1 1 1 1 1 1 1 2 3 87%	2520
	21st to end	Day	1 1 1 1 1 1 1 2 2 88%	2520
July	1st to 10th	Day	1 1 1 1 2 3 91%	2520
	11th to 20th	Day	1 1 1 1 1 1 2 2 2 3 87%	2441
	21st to end	Day	1 1 1 1 1 2 2 4 87%	2546
August	1st to 10th	Day	1 2 1 1 1 1 1 2 1 3 86%	2322
	11th to 20th	Day	1 1 1 1 1 2 2 91%	2122
	21st to end	Day	1 1 1 1 1 2 3 90%	2376
September	1st to 10th	Day	1 1 1 1 1 1 1 2 2 90%	2160
	11th to 20th	Day	1 1 1 1 1 1 1 2 3 5% 84%	2160
	21st to end	Day	2 1 1 1 1 1 1 2 2 4 84%	1950
October	1st to 10th	Day	2 1 1 2 2 1 2 2 3 6% 78%	1800
	11th to 20th	Day	3 1 1 2 2 2 2 3 4 5% 76%	1800
	21st to end	Day	4 2 1 3 3 1 2 2 4 6% 71%	1980
November	1st to 10th	Day	5% 3 1 3 3 3 5% 4 5% 7% 61%	1756
	11th to 20th	Day	6% 3 1 4 2 2 5% 4 5% 8% 60%	1710
	21st to end	Day	8% 4 2 4 4 2 3 5% 6% 7% 57%	1653
December	1st to 10th	Day	10% 6% 2 5% 6% 3 4 4 5% 7% 48%	1520
	11th to 20th	Day	20% 8% 4 6% 6% 3 4 3 5% 5% 35%	1928
	21st to end	Day	10% 7% 3 7% 7% 3 6% 6% 5% 7% 39%	2794
January	1st to 10th	Night	10% 6% 2 4 4 2 4 4 5% 7% 52%	4344
	11th to 20th	Night	15% 7% 4 6% 4 3 4 4 5% 7% 41%	4110
	21st to end	Night	15% 7% 3 6% 5% 3 4 5% 5% 7% 41%	4521
February	1st to 10th	Night	12% 4 2 4 4 2 3 4 4 6% 56%	2470
	11th to 20th	Night	8% 4 1 3 3 2 4 4 5% 8% 58%	2242
	21st to end	Night	11% 3 2 4 3 2 4 3 3 6% 59%	1829
March	1st to 10th	Night	10% 5% 3 5% 4 3 5% 5% 5% 7% 49%	2088
	11th to 20th	Night	9% 4 1 4 4 2 5% 5% 4 8% 53%	1980
	21st to end	Night	10% 3 2 3 3 1 4 3 4 7% 58%	2098
April	1st to 10th	Night	7% 3 1 4 4 3 4 4 5% 8% 57%	1800
	11th to 20th	Night	5% 3 1 3 3 2 3 3 4 6% 66%	1779
	21st to end	Night	3 2 1 2 2 1 2 4 4 8% 73%	1800
May	1st to 10th	Night	2 2 1 3 3 2 2 3 4 6% 74%	1800
	11th to 20th	Night	3 1 1 1 2 1 2 2 3 7% 78%	1499
	21st to end	Night	2 1 1 2 1 1 2 2 3 4 81%	1552
June	1st to 10th	Night	2 2 1 2 2 1 2 3 3 5% 78%	1440
	11th to 20th	Night	1 1 1 1 1 2 2 3 88%	1440
	21st to end	Night	1 1 2 1 3 91%	1440
July	1st to 10th	Night	1 1 1 1 1 1 3 91%	1440
	11th to 20th	Night	1 1 1 1 1 1 2 1 2 4 87%	1515
	21st to end	Night	1 1 1 1 1 1 2 2 3 4 83%	1773
August	1st to 10th	Night	1 1 1 1 2 1 2 2 2 87%	1615
	11th to 20th	Night	1 1 1 1 1 2 2 3 87%	1780
	21st to end	Night	1 1 1 1 1 1 2 92%	1980
September	1st to 10th	Night	1 1 1 1 1 1 2 2 91%	1800
	11th to 20th	Night	2 1 1 1 1 1 1 1 2 3 87%	1800
	21st to end	Night	1 1 1 1 2 1 1 1 2 3 86%	2006
October	1st to 10th	Night	3 2 1 1 2 2 2 2 3 5% 78%	2160
	11th to 20th	Night	2 1 1 2 2 1 2 2 4 6% 77%	2160
	21st to end	Night	4 2 1 2 2 1 2 2 3 5% 78%	2376
November	1st to 10th	Night	5% 2 1 2 3 1 3 3 4 6% 69%	2322
	11th to 20th	Night	6% 3 1 3 3 2 3 3 5% 8% 64%	2470
	21st to end	Night	6% 3 1 3 3 2 4 4 4 6% 64%	2522
December	1st to 10th	Night	10% 5% 2 4 5% 2 3 4 4 6% 54%	2660
	11th to 20th	Night	16% 7% 2 6% 5% 2 5% 4 6% 8% 38%	3276
	21st to end	Night	15% 6% 2 5% 5% 3 5% 5% 5% 7% 41%	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	40% 13% 16% 23% 7% 2	2585
	11th to 20th	Day	46% 11% 12% 15% 12% 4	2860
	21st to end	Day	46% 11% 13% 17% 11% 2	3146
February	1st to 10th	Day	34% 8% 11% 23% 18% 7%	1710
	11th to 20th	Day	29% 8% 14% 22% 22% 5%	1834
	21st to end	Day	32% 5% 13% 24% 20% 6%	1521
March	1st to 10th	Day	35% 9% 14% 21% 17% 4	1870
	11th to 20th	Day	33% 9% 12% 23% 19% 5%	1980
	21st to end	Day	28% 10% 17% 21% 17% 5%	2257
April	1st to 10th	Day	30% 8% 13% 22% 20% 8%	2160
	11th to 20th	Day	22% 6% 13% 27% 26% 7%	2132
	21st to end	Day	17% 5% 12% 30% 29% 7%	2160
May	1st to 10th	Day	13% 5% 12% 25% 32% 12%	2160
	11th to 20th	Day	13% 3 10% 27% 33% 14%	2392
	21st to end	Day	12% 5% 16% 28% 30% 9%	2724
June	1st to 10th	Day	12% 5% 11% 23% 31% 18%	2520
	11th to 20th	Day	5% 2 7% 21% 35% 31%	2520
	21st to end	Day	6% 2 3 9% 31% 48%	2520
July	1st to 10th	Day	3 1 2 8% 23% 63%	2451
	11th to 20th	Day	6% 2 4 9% 21% 57%	2366
	21st to end	Day	5% 2 3 8% 28% 55%	2405
August	1st to 10th	Day	7% 2 3 9% 29% 49%	2306
	11th to 20th	Day	3 1 3 11% 31% 50%	2122
	21st to end	Day	4 1 2 11% 34% 48%	2376
September	1st to 10th	Day	4 2 3 9% 27% 55%	2160
	11th to 20th	Day	6% 2 6% 19% 41% 25%	2160
	21st to end	Day	7% 2 4 20% 40% 27%	1950
October	1st to 10th	Day	11% 3 9% 20% 28% 30%	1800
	11th to 20th	Day	12% 4 8% 23% 27% 26%	1800
	21st to end	Day	16% 4 9% 21% 28% 21%	1980
November	1st to 10th	Day	22% 7% 11% 22% 26% 10%	1756
	11th to 20th	Day	22% 9% 14% 27% 23% 5%	1710
	21st to end	Day	26% 8% 11% 22% 26% 7%	1653
December	1st to 10th	Day	35% 8% 13% 19% 17% 8%	1520
	11th to 20th	Day	51% 8% 10% 16% 12% 3	1928
	21st to end	Day	41% 12% 17% 17% 11% 2	2794
January	1st to 10th	Night	31% 11% 19% 26% 11% 2	4344
	11th to 20th	Night	43% 11% 15% 15% 10% 7%	4110
	21st to end	Night	42% 11% 14% 17% 13% 4	4521
February	1st to 10th	Night	31% 6% 10% 24% 21% 9%	2470
	11th to 20th	Night	24% 7% 14% 22% 24% 8%	2243
	21st to end	Night	27% 6% 11% 28% 20% 8%	1829
March	1st to 10th	Night	33% 8% 16% 19% 17% 7%	2088
	11th to 20th	Night	29% 9% 13% 21% 21% 8%	1980
	21st to end	Night	26% 9% 15% 22% 19% 9%	2098
April	1st to 10th	Night	25% 9% 14% 23% 21% 9%	1800
	11th to 20th	Night	19% 6% 14% 27% 23% 11%	1779
	21st to end	Night	13% 6% 13% 29% 30% 9%	1800
May	1st to 10th	Night	14% 5% 11% 24% 31% 16%	1800
	11th to 20th	Night	11% 3 10% 27% 35% 15%	1499
	21st to end	Night	9% 4 14% 31% 32% 11%	1552
June	1st to 10th	Night	12% 5% 11% 20% 33% 20%	1440
	11th to 20th	Night	4 3 8% 17% 32% 36%	1440
	21st to end	Night	3 2 3 10% 33% 48%	1440
July	1st to 10th	Night	3 1 3 7% 23% 64%	1400
	11th to 20th	Night	5% 2 5% 7% 26% 54%	1467
	21st to end	Night	7% 2 3 9% 24% 54%	1674
August	1st to 10th	Night	7% 2 3 14% 29% 47%	1606
	11th to 20th	Night	5% 2 3 11% 31% 49%	1780
	21st to end	Night	4 1 3 11% 32% 50%	1980
September	1st to 10th	Night	4 2 3 8% 25% 59%	1800
	11th to 20th	Night	7% 2 5% 19% 35% 32%	1800
	21st to end	Night	8% 2 4 17% 36% 33%	2006
October	1st to 10th	Night	12% 4 8% 19% 24% 34%	2160
	11th to 20th	Night	12% 4 8% 19% 26% 30%	2160
	21st to end	Night	11% 4 7% 21% 31% 26%	2376
November	1st to 10th	Night	16% 6% 12% 23% 26% 16%	2322
	11th to 20th	Night	21% 5% 13% 23% 30% 7%	2470
	21st to end	Night	22% 6% 10% 24% 26% 11%	2522
December	1st to 10th	Night	31% 8% 11% 21% 17% 11%	2660
	11th to 20th	Night	44% 10% 13% 16% 15% 3	3276
	21st to end	Night	41% 11% 16% 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	24% 9% 21% 26% 15% 5%	213
	11th to 20th	Day	11% 6% 24% 25% 24% 9%	370
	21st to end	Day	10% 6% 21% 28% 26% 9%	407
February	1st to 10th	Day	15% 11% 20% 20% 22% 12%	370
	11th to 20th	Day	10% 12% 25% 27% 19% 7%	443
	21st to end	Day	11% 12% 24% 31% 20% 4	363
March	1st to 10th	Day	13% 13% 22% 32% 15% 4	420
	11th to 20th	Day	13% 13% 21% 28% 18% 7%	420
	21st to end	Day	11% 12% 27% 29% 16% 4	462
April	1st to 10th	Day	12% 10% 25% 25% 22% 5%	420
	11th to 20th	Day	7% 13% 26% 30% 19% 5%	412
	21st to end	Day	4 10% 26% 33% 18% 10%	420
May	1st to 10th	Day	4 9% 26% 33% 21% 7%	423
	11th to 20th	Day	3 8% 26% 31% 24% 8%	448
	21st to end	Day	3 8% 19% 31% 28% 11%	485
June	1st to 10th	Day	2 6% 20% 33% 28% 10%	450
	11th to 20th	Day	1 6% 20% 38% 28% 7%	450
	21st to end	Day	3 15% 33% 35% 13%	450
July	1st to 10th	Day	8% 34% 45% 12%	446
	11th to 20th	Day	1 4 34% 46% 15%	444
	21st to end	Day	1 5% 32% 45% 17%	487
August	1st to 10th	Day	2 1 10% 36% 40% 12%	447
	11th to 20th	Day	10% 30% 41% 19%	437
	21st to end	Day	1 5% 30% 47% 17%	495
September	1st to 10th	Day	1 2 9% 29% 43% 16%	450
	11th to 20th	Day	2 2 13% 33% 37% 13%	450
	21st to end	Day	1 4 12% 26% 41% 16%	450
October	1st to 10th	Day	2 5% 20% 22% 32% 18%	450
	11th to 20th	Day	3 5% 15% 27% 31% 19%	450
	21st to end	Day	4 4 15% 27% 32% 18%	495
November	1st to 10th	Day	5% 7% 16% 22% 34% 16%	352
	11th to 20th	Day	4 4 17% 26% 37% 12%	270
	21st to end	Day	7% 2 17% 30% 39% 5%	243
December	1st to 10th	Day	13% 8% 19% 27% 23% 9%	180
	11th to 20th	Day	12% 8% 19% 29% 22% 10%	180
	21st to end	Day	11% 14% 21% 27% 23% 5%	198
January	1st to 10th	Night	14% 5% 17% 34% 23% 8%	760
	11th to 20th	Night	11% 5% 14% 36% 27% 7%	760
	21st to end	Night	13% 3 15% 35% 28% 5%	836
February	1st to 10th	Night	14% 7% 14% 34% 26% 6%	760
	11th to 20th	Night	9% 7% 18% 35% 26% 6%	744
	21st to end	Night	11% 7% 20% 40% 19% 3	610
March	1st to 10th	Night	12% 7% 20% 36% 22% 4	720
	11th to 20th	Night	9% 6% 22% 33% 25% 5%	720
	21st to end	Night	10% 5% 25% 37% 21% 2	792
April	1st to 10th	Night	8% 5% 24% 40% 20% 3	720
	11th to 20th	Night	5% 8% 26% 35% 21% 4	711
	21st to end	Night	3 4 28% 37% 24% 4	720
May	1st to 10th	Night	3 3 28% 40% 22% 3	720
	11th to 20th	Night	4 3 21% 41% 29% 3	437
	21st to end	Night	2 5% 22% 45% 26% 1	389
June	1st to 10th	Night	2 1 21% 51% 24% 1	360
	11th to 20th	Night	1 2 20% 49% 27% 1	360
	21st to end	Night	1 12% 53% 33% 1	360
July	1st to 10th	Night	8% 50% 39% 2	350
	11th to 20th	Night	3 46% 47% 3	423
	21st to end	Night	1 1 5% 41% 47% 6%	591
August	1st to 10th	Night	1 7% 46% 41% 4	541
	11th to 20th	Night	9% 49% 37% 4	712
	21st to end	Night	1 6% 42% 46% 5%	792
September	1st to 10th	Night	1 8% 44% 41% 7%	720
	11th to 20th	Night	3 1 12% 42% 37% 6%	720
	21st to end	Night	2 1 11% 34% 42% 9%	720
October	1st to 10th	Night	3 3 13% 38% 34% 9%	720
	11th to 20th	Night	2 3 14% 35% 36% 10%	720
	21st to end	Night	4 2 13% 33% 31% 16%	792
November	1st to 10th	Night	4 2 16% 34% 35% 9%	740
	11th to 20th	Night	7% 2 14% 36% 35% 7%	760
	21st to end	Night	6% 4 16% 37% 31% 7%	760
December	1st to 10th	Night	11% 4 15% 38% 25% 6%	760
	11th to 20th	Night	13% 5% 17% 35% 26% 4	760
	21st to end	Night	13% 8% 20% 35% 21% 3	836

Page generated at 2024-02-22 03:05:42. Version ac07

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