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 2026-08-30.

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	4 3 1 3 2 2 3 2 3 5% 72%	152227
	Night	5% 3 1 3 2 2 3 2 4 5% 69%	147456
Transparency	Day	16% 5% 8% 18% 27% 26%	147201
	Night	19% 5% 9% 19% 25% 23%	143478
Seeing	Day	5% 6% 16% 29% 30% 14%	17736
	Night	6% 4 16% 39% 30% 5%	27099

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% 7% 2 6% 4 4 4 3 4 7% 46%	4824
	11th to 20th	Day	6% 5% 2 6% 3 4 4 3 4 7% 57%	5340
	21st to end	Day	10% 6% 2 7% 5% 5% 4 4 5% 7% 44%	5843
February	1st to 10th	Day	11% 5% 2 6% 3 3 4 4 5% 7% 49%	1890
	11th to 20th	Day	8% 5% 2 5% 4 4 4 3 5% 8% 51%	2022
	21st to end	Day	10% 4 2 5% 3 4 4 3 5% 6% 54%	1730
March	1st to 10th	Day	8% 5% 2 6% 5% 5% 6% 4 7% 8% 44%	4796
	11th to 20th	Day	8% 4 1 4 3 4 4 3 5% 7% 57%	5110
	21st to end	Day	8% 5% 2 6% 4 4 4 4 6% 9% 48%	5819
April	1st to 10th	Day	7% 6% 2 5% 3 3 3 3 6% 6% 56%	2520
	11th to 20th	Day	5% 3 1 4 3 3 3 3 5% 7% 62%	2489
	21st to end	Day	4 3 1 3 3 2 3 3 4 6% 69%	2520
May	1st to 10th	Day	3 2 1 3 2 2 2 2 3 5% 77%	7058
	11th to 20th	Day	1 1 1 1 1 1 1 2 3 87%	7893
	21st to end	Day	1 1 2 1 1 2 1 2 3 84%	8992
June	1st to 10th	Day	1 2 1 2 2 2 3 2 3 6% 76%	2940
	11th to 20th	Day	1 1 1 1 1 1 2 3 89%	2940
	21st to end	Day	1 1 1 1 1 1 1 2 2 89%	2940
July	1st to 10th	Day	1 1 1 2 95%	8219
	11th to 20th	Day	2 1 1 1 1 1 2 1 2 3 84%	7959
	21st to end	Day	1 1 1 1 3 92%	8304
August	1st to 10th	Day	1 1 1 1 1 1 1 2 3 88%	5876
	11th to 20th	Day	1 1 1 2 94%	5484
	21st to end	Day	1 1 1 1 1 1 2 3 88%	6093
September	1st to 10th	Day	1 1 1 1 1 1 1 1 2 90%	2400
	11th to 20th	Day	1 1 1 1 1 1 1 1 3 5% 83%	2400
	21st to end	Day	2 2 1 2 1 1 2 1 2 4 84%	2166
October	1st to 10th	Day	1 1 1 2 2 1 2 2 3 5% 80%	3280
	11th to 20th	Day	2 1 2 2 2 1 2 3 4 82%	3261
	21st to end	Day	3 2 1 4 3 3 3 2 4 6% 70%	3558
November	1st to 10th	Day	4 3 1 3 3 5% 4 3 5% 7% 63%	1944
	11th to 20th	Day	8% 4 1 4 2 3 5% 3 6% 7% 57%	1890
	21st to end	Day	8% 5% 2 5% 3 3 3 4 6% 7% 55%	1827
December	1st to 10th	Day	6% 4 2 5% 4 3 4 3 6% 8% 54%	2700
	11th to 20th	Day	14% 7% 4 8% 6% 5% 5% 4 6% 7% 33%	3108
	21st to end	Day	12% 7% 3 8% 5% 5% 6% 4 6% 8% 36%	4092
January	1st to 10th	Night	11% 6% 2 5% 3 3 3 3 5% 7% 53%	8058
	11th to 20th	Night	8% 4 2 4 2 3 3 3 4 6% 62%	7650
	21st to end	Night	9% 6% 2 6% 4 4 4 3 5% 7% 51%	8371
February	1st to 10th	Night	12% 5% 2 5% 3 3 3 3 4 6% 55%	2730
	11th to 20th	Night	8% 5% 1 4 3 3 4 3 5% 9% 55%	2484
	21st to end	Night	10% 4 1 5% 3 3 3 2 4 6% 59%	2076
March	1st to 10th	Night	7% 5% 2 6% 4 5% 6% 4 6% 7% 47%	5303
	11th to 20th	Night	7% 4 2 6% 3 3 4 3 4 5% 59%	5110
	21st to end	Night	10% 5% 2 4 3 3 4 4 5% 8% 53%	5397
April	1st to 10th	Night	6% 4 1 4 3 3 4 3 5% 8% 59%	2100
	11th to 20th	Night	4 3 1 4 3 3 3 3 5% 6% 65%	2079
	21st to end	Night	3 3 1 3 2 1 2 3 4 7% 71%	2100
May	1st to 10th	Night	2 2 1 2 2 2 2 1 3 5% 78%	5919
	11th to 20th	Night	1 1 1 1 1 2 1 2 4 88%	4947
	21st to end	Night	1 1 1 1 1 1 1 2 3 89%	5181
June	1st to 10th	Night	2 1 1 2 1 2 2 2 4 5% 78%	1680
	11th to 20th	Night	1 1 1 1 1 1 2 3 90%	1680
	21st to end	Night	1 1 1 2 92%	1680
July	1st to 10th	Night	1 1 1 96%	4740
	11th to 20th	Night	1 1 1 2 2 1 2 1 2 2 84%	4997
	21st to end	Night	1 1 1 1 1 2 2 90%	5806
August	1st to 10th	Night	1 1 1 1 1 1 2 2 89%	4143
	11th to 20th	Night	1 1 1 1 2 94%	4606
	21st to end	Night	1 1 1 1 1 1 1 2 2 88%	5105
September	1st to 10th	Night	1 1 1 1 1 2 2 91%	2000
	11th to 20th	Night	2 1 1 1 1 1 1 1 2 3 86%	2000
	21st to end	Night	2 1 1 1 2 2 1 1 2 3 85%	2230
October	1st to 10th	Night	2 1 1 1 2 2 1 3 4 83%	3920
	11th to 20th	Night	2 1 1 2 2 1 2 1 3 5% 81%	3897
	21st to end	Night	3 2 1 3 2 2 2 2 4 5% 74%	4253
November	1st to 10th	Night	5% 2 1 2 2 2 3 2 5% 6% 70%	2574
	11th to 20th	Night	7% 3 1 4 3 2 3 3 4 8% 61%	2730
	21st to end	Night	6% 5% 2 3 3 3 4 3 4 6% 61%	2788
December	1st to 10th	Night	6% 3 2 4 3 3 4 3 5% 6% 62%	4700
	11th to 20th	Night	13% 6% 2 7% 5% 4 5% 4 7% 10% 37%	5316
	21st to end	Night	14% 7% 2 7% 5% 5% 5% 4 6% 7% 36%	7106

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	34% 10% 18% 22% 13% 3	4825
	11th to 20th	Day	26% 7% 8% 16% 29% 15%	5340
	21st to end	Day	36% 8% 10% 20% 20% 6%	5843
February	1st to 10th	Day	34% 7% 10% 23% 18% 7%	1890
	11th to 20th	Day	29% 8% 15% 22% 20% 5%	2032
	21st to end	Day	32% 6% 14% 25% 18% 6%	1730
March	1st to 10th	Day	33% 12% 13% 18% 22% 2	4796
	11th to 20th	Day	25% 7% 13% 31% 15% 8%	5110
	21st to end	Day	28% 12% 17% 29% 12% 2	5819
April	1st to 10th	Day	28% 7% 13% 24% 21% 7%	2520
	11th to 20th	Day	21% 7% 13% 27% 25% 7%	2492
	21st to end	Day	18% 5% 12% 30% 28% 7%	2520
May	1st to 10th	Day	12% 3 7% 24% 36% 17%	7058
	11th to 20th	Day	5% 2 4 23% 47% 19%	7896
	21st to end	Day	7% 3 7% 22% 49% 13%	8994
June	1st to 10th	Day	10% 5% 11% 24% 33% 18%	2940
	11th to 20th	Day	4 1 6% 18% 37% 33%	2940
	21st to end	Day	6% 2 3 9% 31% 50%	2940
July	1st to 10th	Day	1 1 1 4 21% 72%	8151
	11th to 20th	Day	9% 2 2 5% 13% 70%	7884
	21st to end	Day	2 1 2 12% 28% 55%	8119
August	1st to 10th	Day	7% 2 2 6% 30% 53%	4316
	11th to 20th	Day	2 1 2 8% 31% 56%	4000
	21st to end	Day	5% 1 3 9% 30% 52%	4420
September	1st to 10th	Day	4 2 3 10% 28% 53%	2400
	11th to 20th	Day	7% 2 6% 20% 41% 24%	2400
	21st to end	Day	8% 2 4 19% 38% 28%	2166
October	1st to 10th	Day	9% 2 5% 12% 22% 49%	3280
	11th to 20th	Day	9% 3 6% 23% 39% 21%	3261
	21st to end	Day	16% 4 6% 20% 36% 17%	3558
November	1st to 10th	Day	21% 7% 12% 23% 27% 10%	1944
	11th to 20th	Day	24% 9% 14% 27% 21% 4	1890
	21st to end	Day	27% 8% 10% 23% 25% 6%	1827
December	1st to 10th	Day	28% 5% 10% 31% 21% 5%	2700
	11th to 20th	Day	45% 9% 13% 19% 12% 2	3108
	21st to end	Day	42% 13% 17% 16% 10% 1	4092
January	1st to 10th	Night	31% 8% 19% 27% 13% 3	8058
	11th to 20th	Night	24% 6% 9% 17% 33% 11%	7650
	21st to end	Night	33% 7% 10% 21% 20% 9%	8371
February	1st to 10th	Night	32% 5% 9% 23% 21% 10%	2730
	11th to 20th	Night	27% 7% 13% 23% 23% 7%	2485
	21st to end	Night	27% 7% 12% 28% 19% 8%	2076
March	1st to 10th	Night	33% 11% 13% 15% 23% 5%	5303
	11th to 20th	Night	26% 7% 14% 26% 17% 9%	5110
	21st to end	Night	27% 11% 18% 26% 14% 4	5397
April	1st to 10th	Night	23% 8% 14% 24% 22% 9%	2100
	11th to 20th	Night	20% 6% 14% 28% 22% 11%	2079
	21st to end	Night	14% 6% 12% 30% 29% 8%	2100
May	1st to 10th	Night	11% 3 9% 25% 31% 21%	5917
	11th to 20th	Night	5% 1 4 20% 41% 29%	4947
	21st to end	Night	4 2 6% 24% 45% 18%	5182
June	1st to 10th	Night	10% 4 10% 20% 35% 21%	1680
	11th to 20th	Night	4 2 7% 16% 32% 39%	1680
	21st to end	Night	3 2 3 10% 32% 50%	1680
July	1st to 10th	Night	2 1 1 4 20% 73%	4700
	11th to 20th	Night	9% 1 2 5% 15% 68%	4949
	21st to end	Night	4 1 1 12% 27% 55%	5679
August	1st to 10th	Night	6% 1 2 9% 30% 51%	3037
	11th to 20th	Night	3 1 2 8% 29% 58%	3356
	21st to end	Night	5% 1 3 10% 28% 53%	3698
September	1st to 10th	Night	4 2 3 9% 26% 56%	2000
	11th to 20th	Night	8% 2 5% 19% 36% 30%	2000
	21st to end	Night	8% 2 4 16% 35% 34%	2230
October	1st to 10th	Night	8% 3 5% 12% 18% 55%	3920
	11th to 20th	Night	9% 3 6% 25% 33% 25%	3897
	21st to end	Night	13% 3 5% 19% 37% 22%	4253
November	1st to 10th	Night	15% 6% 12% 25% 27% 15%	2574
	11th to 20th	Night	23% 6% 13% 23% 29% 7%	2730
	21st to end	Night	25% 6% 10% 24% 25% 11%	2788
December	1st to 10th	Night	23% 6% 9% 29% 26% 8%	4700
	11th to 20th	Night	37% 10% 16% 20% 14% 2	5316
	21st to end	Night	44% 12% 14% 19% 9% 3	7106

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	23% 9% 21% 26% 16% 5%	257
	11th to 20th	Day	10% 7% 21% 24% 26% 13%	430
	21st to end	Day	9% 6% 19% 31% 26% 9%	473
February	1st to 10th	Day	15% 10% 21% 21% 23% 11%	430
	11th to 20th	Day	10% 13% 26% 28% 17% 6%	521
	21st to end	Day	9% 10% 23% 35% 18% 4	446
March	1st to 10th	Day	11% 14% 20% 34% 16% 4	540
	11th to 20th	Day	11% 13% 19% 28% 20% 8%	540
	21st to end	Day	10% 12% 24% 31% 18% 5%	594
April	1st to 10th	Day	10% 10% 24% 25% 21% 10%	540
	11th to 20th	Day	6% 12% 24% 29% 21% 8%	532
	21st to end	Day	3 9% 26% 32% 19% 11%	540
May	1st to 10th	Day	3 8% 25% 32% 21% 11%	543
	11th to 20th	Day	3 7% 24% 29% 26% 11%	568
	21st to end	Day	3 6% 16% 31% 29% 14%	617
June	1st to 10th	Day	2 5% 17% 33% 28% 15%	570
	11th to 20th	Day	1 5% 18% 35% 30% 12%	570
	21st to end	Day	1 3 15% 31% 32% 19%	570
July	1st to 10th	Day	1 7% 33% 41% 18%	566
	11th to 20th	Day	1 4 30% 43% 21%	564
	21st to end	Day	5% 29% 42% 24%	619
August	1st to 10th	Day	1 1 8% 32% 36% 22%	567
	11th to 20th	Day	8% 29% 39% 23%	557
	21st to end	Day	1 5% 27% 45% 22%	620
September	1st to 10th	Day	1 2 9% 27% 43% 19%	530
	11th to 20th	Day	2 3 12% 31% 37% 15%	530
	21st to end	Day	2 3 11% 26% 41% 17%	530
October	1st to 10th	Day	2 5% 17% 21% 33% 21%	530
	11th to 20th	Day	4 5% 16% 25% 30% 20%	530
	21st to end	Day	3 5% 14% 28% 33% 17%	583
November	1st to 10th	Day	5% 7% 15% 21% 34% 18%	420
	11th to 20th	Day	8% 6% 17% 27% 32% 10%	330
	21st to end	Day	7% 3 17% 30% 35% 7%	297
December	1st to 10th	Day	11% 7% 16% 26% 26% 13%	220
	11th to 20th	Day	10% 8% 18% 30% 24% 11%	220
	21st to end	Day	12% 12% 22% 28% 21% 4	242
January	1st to 10th	Night	15% 5% 17% 35% 22% 7%	840
	11th to 20th	Night	10% 5% 13% 36% 29% 6%	840
	21st to end	Night	12% 3 15% 36% 29% 5%	924
February	1st to 10th	Night	14% 7% 15% 35% 24% 5%	840
	11th to 20th	Night	9% 7% 19% 36% 24% 5%	824
	21st to end	Night	10% 6% 20% 44% 17% 3	692
March	1st to 10th	Night	11% 8% 21% 37% 20% 3	840
	11th to 20th	Night	9% 6% 22% 34% 25% 4	840
	21st to end	Night	9% 6% 24% 40% 20% 2	924
April	1st to 10th	Night	7% 5% 24% 39% 22% 2	840
	11th to 20th	Night	5% 8% 25% 36% 22% 4	831
	21st to end	Night	4 5% 27% 37% 24% 4	840
May	1st to 10th	Night	2 3 29% 39% 23% 4	840
	11th to 20th	Night	3 2 21% 42% 29% 2	509
	21st to end	Night	1 4 21% 46% 26% 1	455
June	1st to 10th	Night	2 1 18% 52% 25% 1	420
	11th to 20th	Night	2 18% 51% 27% 1	420
	21st to end	Night	12% 51% 36% 1	420
July	1st to 10th	Night	8% 52% 39% 2	410
	11th to 20th	Night	1 3 43% 49% 4	496
	21st to end	Night	1 4 39% 50% 6%	690
August	1st to 10th	Night	1 6% 41% 45% 6%	632
	11th to 20th	Night	9% 47% 40% 4	832
	21st to end	Night	1 5% 42% 47% 5%	916
September	1st to 10th	Night	1 7% 44% 41% 6%	800
	11th to 20th	Night	3 1 12% 42% 37% 5%	800
	21st to end	Night	2 2 11% 37% 41% 8%	800
October	1st to 10th	Night	3 3 12% 39% 34% 9%	800
	11th to 20th	Night	3 4 13% 36% 36% 10%	800
	21st to end	Night	4 3 13% 35% 31% 15%	880
November	1st to 10th	Night	4 3 15% 33% 36% 9%	820
	11th to 20th	Night	8% 2 15% 37% 32% 6%	840
	21st to end	Night	7% 4 16% 37% 30% 7%	840
December	1st to 10th	Night	10% 4 14% 39% 26% 7%	840
	11th to 20th	Night	13% 5% 16% 36% 27% 4	840
	21st to end	Night	14% 8% 20% 37% 20% 3	924

Page generated at 2026-08-27 01:07:15. Version ac07

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