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 2024-10-25.

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 2 2 3 2 4 5% 70%	100983
	Night	6% 3 1 3 2 2 3 2 4 5% 68%	98016
Transparency	Day	18% 5% 9% 18% 24% 26%	100736
	Night	20% 6% 10% 18% 23% 23%	97852
Seeing	Day	5% 6% 17% 29% 30% 12%	15324
	Night	6% 4 16% 39% 30% 5%	24716

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% 3 8% 5% 4 5% 3 5% 7% 39%	2585
	11th to 20th	Day	10% 9% 4 10% 6% 5% 6% 3 5% 7% 36%	2860
	21st to end	Day	17% 8% 3 7% 5% 4 5% 4 5% 7% 36%	3146
February	1st to 10th	Day	12% 5% 2 6% 3 3 4 4 5% 7% 49%	1710
	11th to 20th	Day	8% 5% 2 5% 4 4 4 3 5% 8% 52%	1824
	21st to end	Day	11% 4 2 5% 4 3 4 3 5% 5% 55%	1570
March	1st to 10th	Day	6% 6% 2 7% 5% 6% 6% 5% 8% 9% 39%	3260
	11th to 20th	Day	6% 4 1 4 3 3 3 3 5% 7% 61%	3490
	21st to end	Day	8% 6% 2 6% 4 5% 5% 5% 7% 8% 44%	3968
April	1st to 10th	Day	8% 6% 2 5% 4 3 3 3 5% 6% 55%	2280
	11th to 20th	Day	5% 3 1 4 3 3 3 3 5% 6% 63%	2249
	21st to end	Day	4 3 1 3 2 2 3 2 3 6% 70%	2280
May	1st to 10th	Day	4 1 1 2 1 1 2 2 3 5% 78%	3800
	11th to 20th	Day	1 1 1 1 1 1 2 2 2 4 84%	4237
	21st to end	Day	1 1 1 1 1 1 2 3 3 84%	4813
June	1st to 10th	Day	1 2 1 2 2 2 3 2 4 6% 75%	2660
	11th to 20th	Day	1 1 1 1 1 1 2 3 88%	2660
	21st to end	Day	1 1 1 1 1 1 1 2 2 88%	2660
July	1st to 10th	Day	1 1 1 1 95%	4420
	11th to 20th	Day	1 1 1 1 1 1 2 1 2 2 86%	4276
	21st to end	Day	1 1 1 1 2 92%	4455
August	1st to 10th	Day	1 1 1 1 2 2 1 3 4 84%	4072
	11th to 20th	Day	1 1 1 2 93%	3724
	21st to end	Day	1 1 1 1 1 1 2 2 90%	4180
September	1st to 10th	Day	1 1 1 1 1 1 1 1 2 91%	2280
	11th to 20th	Day	1 1 1 1 1 1 1 1 3 5% 83%	2280
	21st to end	Day	1 1 2 1 1 2 1 2 4 84%	2058
October	1st to 10th	Day	2 1 1 2 2 2 2 1 3 6% 78%	1900
	11th to 20th	Day	3 1 2 2 2 2 3 4 5% 76%	1900
	21st to end	Day	4 2 1 4 2 2 3 2 4 5% 71%	2025
November	1st to 10th	Day	5% 3 1 3 3 5% 4 3 5% 7% 61%	1756
	11th to 20th	Day	6% 3 1 4 2 2 5% 3 6% 7% 60%	1710
	21st to end	Day	7% 5% 1 5% 3 3 3 4 6% 7% 57%	1653
December	1st to 10th	Day	10% 6% 3 6% 5% 4 4 3 5% 7% 48%	1520
	11th to 20th	Day	20% 9% 4 8% 5% 4 4 3 5% 5% 35%	1928
	21st to end	Day	10% 7% 3 8% 6% 5% 6% 5% 5% 7% 39%	2794
January	1st to 10th	Night	10% 6% 2 5% 3 3 4 3 6% 6% 52%	4344
	11th to 20th	Night	15% 7% 4 7% 3 4 4 3 5% 7% 41%	4110
	21st to end	Night	15% 7% 2 7% 4 4 4 4 5% 7% 40%	4521
February	1st to 10th	Night	12% 5% 2 5% 3 3 3 3 5% 6% 55%	2470
	11th to 20th	Night	8% 4 1 4 3 3 4 3 5% 9% 57%	2242
	21st to end	Night	10% 4 1 5% 3 3 3 2 4 6% 59%	1884
March	1st to 10th	Night	8% 5% 2 6% 4 5% 6% 4 7% 7% 45%	3599
	11th to 20th	Night	7% 3 1 4 3 2 4 3 3 5% 64%	3490
	21st to end	Night	11% 5% 2 4 4 4 4 3 6% 8% 49%	3684
April	1st to 10th	Night	7% 4 1 4 4 3 4 3 5% 8% 58%	1900
	11th to 20th	Night	5% 3 1 3 3 3 2 3 4 6% 66%	1879
	21st to end	Night	2 2 2 2 2 2 3 4 7% 73%	1900
May	1st to 10th	Night	1 1 1 2 1 2 2 1 2 4 82%	3180
	11th to 20th	Night	2 1 1 1 1 2 1 2 4 87%	2641
	21st to end	Night	1 1 1 1 1 1 1 2 3 88%	2762
June	1st to 10th	Night	2 2 1 2 2 2 2 2 3 5% 78%	1520
	11th to 20th	Night	1 1 1 1 1 1 2 3 89%	1520
	21st to end	Night	1 1 1 1 2 92%	1520
July	1st to 10th	Night	1 1 1 1 1 2 95%	2540
	11th to 20th	Night	1 1 1 1 1 1 2 1 2 3 87%	2685
	21st to end	Night	1 1 1 1 1 1 1 2 3 89%	3109
August	1st to 10th	Night	1 1 1 1 1 2 2 3 3 85%	2866
	11th to 20th	Night	1 1 1 1 1 2 92%	3126
	21st to end	Night	1 1 1 1 1 1 1 1 92%	3498
September	1st to 10th	Night	1 1 1 2 2 92%	1900
	11th to 20th	Night	2 1 1 1 1 1 1 1 2 3 87%	1900
	21st to end	Night	1 1 1 1 2 1 1 1 2 3 86%	2118
October	1st to 10th	Night	3 2 1 2 2 2 2 1 3 5% 78%	2280
	11th to 20th	Night	2 1 1 2 2 2 2 2 4 6% 77%	2280
	21st to end	Night	4 2 1 2 1 2 2 2 3 5% 78%	2436
November	1st to 10th	Night	5% 2 1 2 2 2 3 2 5% 6% 69%	2322
	11th to 20th	Night	6% 3 1 3 3 2 3 3 4 8% 63%	2470
	21st to end	Night	6% 4 1 3 2 3 4 3 4 6% 64%	2522
December	1st to 10th	Night	10% 5% 2 5% 4 3 3 3 4 6% 54%	2660
	11th to 20th	Night	16% 7% 2 7% 5% 4 4 3 6% 8% 38%	3276
	21st to end	Night	15% 6% 2 6% 5% 4 4 4 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% 25% 19% 6%	1570
March	1st to 10th	Day	35% 15% 17% 16% 15% 3	3260
	11th to 20th	Day	22% 8% 12% 30% 17% 11%	3490
	21st to end	Day	31% 14% 19% 22% 12% 3	3968
April	1st to 10th	Day	29% 8% 13% 23% 20% 7%	2280
	11th to 20th	Day	21% 6% 13% 28% 25% 7%	2252
	21st to end	Day	17% 5% 12% 30% 29% 7%	2280
May	1st to 10th	Day	11% 4 9% 28% 28% 21%	3800
	11th to 20th	Day	7% 2 6% 27% 41% 17%	4240
	21st to end	Day	7% 3 10% 27% 40% 13%	4814
June	1st to 10th	Day	11% 5% 11% 23% 31% 18%	2660
	11th to 20th	Day	5% 2 6% 20% 37% 31%	2660
	21st to end	Day	6% 2 3 9% 30% 50%	2660
July	1st to 10th	Day	2 1 1 4 13% 79%	4351
	11th to 20th	Day	7% 2 3 5% 13% 70%	4201
	21st to end	Day	3 1 2 5% 27% 63%	4315
August	1st to 10th	Day	7% 2 2 6% 29% 54%	4057
	11th to 20th	Day	2 1 2 7% 30% 58%	3760
	21st to end	Day	4 1 3 9% 29% 54%	4179
September	1st to 10th	Day	4 2 3 8% 27% 56%	2280
	11th to 20th	Day	6% 2 6% 19% 41% 25%	2280
	21st to end	Day	7% 2 4 19% 39% 29%	2058
October	1st to 10th	Day	11% 3 8% 19% 27% 33%	1900
	11th to 20th	Day	11% 4 8% 23% 29% 25%	1900
	21st to end	Day	16% 4 9% 21% 29% 22%	2025
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% 7% 12% 28% 20% 7%	1884
March	1st to 10th	Night	35% 14% 17% 15% 15% 4	3599
	11th to 20th	Night	23% 7% 11% 26% 21% 12%	3490
	21st to end	Night	29% 14% 19% 22% 12% 5%	3684
April	1st to 10th	Night	25% 8% 14% 23% 21% 9%	1900
	11th to 20th	Night	20% 6% 14% 28% 22% 11%	1879
	21st to end	Night	12% 6% 13% 30% 30% 9%	1900
May	1st to 10th	Night	8% 4 10% 28% 29% 22%	3180
	11th to 20th	Night	6% 2 6% 20% 42% 24%	2641
	21st to end	Night	5% 2 8% 29% 42% 13%	2762
June	1st to 10th	Night	11% 5% 11% 20% 33% 20%	1520
	11th to 20th	Night	4 3 7% 17% 32% 36%	1520
	21st to end	Night	3 2 3 10% 31% 51%	1520
July	1st to 10th	Night	2 1 1 4 13% 80%	2500
	11th to 20th	Night	6% 2 3 4 17% 68%	2637
	21st to end	Night	4 1 2 8% 22% 62%	3011
August	1st to 10th	Night	7% 1 2 9% 30% 51%	2857
	11th to 20th	Night	3 1 1 6% 29% 60%	3156
	21st to end	Night	5% 1 3 9% 28% 55%	3498
September	1st to 10th	Night	4 2 3 8% 25% 59%	1900
	11th to 20th	Night	7% 1 5% 19% 36% 31%	1900
	21st to end	Night	7% 2 4 16% 36% 34%	2118
October	1st to 10th	Night	12% 4 7% 18% 23% 36%	2280
	11th to 20th	Night	11% 4 8% 20% 27% 30%	2280
	21st to end	Night	11% 4 7% 21% 31% 26%	2436
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	10% 12% 24% 32% 17% 4	382
March	1st to 10th	Day	13% 15% 21% 32% 16% 4	460
	11th to 20th	Day	12% 14% 20% 28% 19% 7%	460
	21st to end	Day	11% 13% 26% 31% 15% 4	506
April	1st to 10th	Day	11% 11% 26% 25% 21% 6%	460
	11th to 20th	Day	7% 13% 25% 29% 21% 5%	452
	21st to end	Day	3 9% 27% 33% 19% 9%	460
May	1st to 10th	Day	4 8% 27% 34% 21% 6%	463
	11th to 20th	Day	3 7% 24% 31% 26% 9%	488
	21st to end	Day	3 8% 18% 32% 29% 11%	529
June	1st to 10th	Day	2 6% 19% 36% 28% 10%	490
	11th to 20th	Day	1 5% 19% 38% 28% 9%	490
	21st to end	Day	1 3 14% 32% 34% 15%	490
July	1st to 10th	Day	7% 33% 44% 16%	486
	11th to 20th	Day	1 4 32% 45% 18%	484
	21st to end	Day	1 5% 31% 43% 20%	531
August	1st to 10th	Day	2 1 9% 34% 38% 16%	487
	11th to 20th	Day	9% 31% 41% 18%	477
	21st to end	Day	1 6% 29% 45% 19%	539
September	1st to 10th	Day	1 2 8% 28% 43% 18%	490
	11th to 20th	Day	2 3 12% 33% 37% 13%	490
	21st to end	Day	1 3 11% 26% 41% 18%	490
October	1st to 10th	Day	2 5% 18% 21% 34% 20%	490
	11th to 20th	Day	3 5% 15% 25% 31% 20%	490
	21st to end	Day	4 4 15% 27% 33% 17%	514
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% 21% 41% 18% 3	628
March	1st to 10th	Night	11% 8% 20% 36% 21% 3	760
	11th to 20th	Night	9% 7% 22% 33% 25% 4	760
	21st to end	Night	9% 6% 25% 38% 20% 2	836
April	1st to 10th	Night	8% 6% 24% 39% 21% 3	760
	11th to 20th	Night	5% 8% 25% 36% 21% 4	751
	21st to end	Night	3 5% 28% 36% 24% 4	760
May	1st to 10th	Night	2 3 30% 40% 21% 3	760
	11th to 20th	Night	4 2 21% 42% 29% 2	460
	21st to end	Night	1 5% 21% 46% 26%	411
June	1st to 10th	Night	2 1 20% 53% 23% 1	380
	11th to 20th	Night	1 2 19% 51% 26% 1	380
	21st to end	Night	1 11% 53% 34% 1	380
July	1st to 10th	Night	8% 50% 41% 2	370
	11th to 20th	Night	3 45% 48% 3	448
	21st to end	Night	1 5% 40% 47% 6%	624
August	1st to 10th	Night	1 7% 44% 42% 5%	572
	11th to 20th	Night	10% 49% 37% 4	752
	21st to end	Night	1 6% 42% 46% 5%	836
September	1st to 10th	Night	1 7% 44% 41% 6%	760
	11th to 20th	Night	3 1 13% 42% 36% 5%	760
	21st to end	Night	2 1 11% 36% 42% 8%	760
October	1st to 10th	Night	3 3 12% 39% 34% 9%	760
	11th to 20th	Night	2 3 13% 35% 36% 10%	760
	21st to end	Night	4 2 13% 33% 32% 16%	812
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 2024-10-22 17:20:59. Version ac07

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