Pullout on Antelope Flats Rd
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pullout on Antelope Flats Rd 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	3 8% 3 8% 5% 5% 5% 4 6% 7% 46%	154172
	Night	2 8% 3 9% 5% 5% 4 4 6% 7% 46%	145608
Transparency	Day	36% 7% 13% 21% 16% 6%	148903
	Night	36% 8% 14% 22% 15% 5%	141886
Seeing	Day	10% 14% 29% 28% 15% 4	18203
	Night	8% 7% 25% 40% 18% 2	27639

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	14% 6% 17% 9% 7% 7% 5% 6% 6% 24%	4838
	11th to 20th	Day	6% 4 12% 7% 5% 4 3 4 6% 49%	5340
	21st to end	Day	1 8% 6% 11% 7% 5% 5% 3 6% 7% 42%	5844
February	1st to 10th	Day	2 17% 7% 17% 8% 5% 6% 4 5% 5% 24%	1890
	11th to 20th	Day	2 15% 8% 15% 9% 6% 5% 4 5% 6% 26%	1845
	21st to end	Day	2 15% 7% 19% 8% 7% 4 3 4 5% 25%	1655
March	1st to 10th	Day	1 13% 6% 13% 7% 5% 5% 3 5% 7% 35%	5007
	11th to 20th	Day	1 9% 6% 13% 6% 6% 5% 4 6% 6% 38%	5110
	21st to end	Day	3 18% 7% 14% 8% 7% 7% 4 6% 5% 21%	5607
April	1st to 10th	Day	5% 16% 4 12% 7% 6% 5% 4 5% 7% 29%	2425
	11th to 20th	Day	4 15% 5% 12% 7% 5% 5% 4 5% 6% 30%	2630
	21st to end	Day	7% 16% 5% 10% 6% 6% 5% 4 6% 8% 29%	2730
May	1st to 10th	Day	5% 10% 3 6% 4 4 5% 4 6% 7% 47%	7626
	11th to 20th	Day	4 8% 3 7% 5% 5% 6% 4 7% 8% 43%	7887
	21st to end	Day	6% 8% 3 7% 5% 6% 5% 4 6% 8% 41%	9026
June	1st to 10th	Day	8% 7% 2 7% 5% 4 5% 5% 7% 8% 41%	2940
	11th to 20th	Day	8% 7% 2 6% 5% 3 5% 4 7% 8% 46%	3119
	21st to end	Day	3 2 1 3 4 3 5% 3 5% 7% 63%	3150
July	1st to 10th	Day	1 2 1 3 3 4 5% 4 7% 8% 61%	8819
	11th to 20th	Day	1 2 1 4 3 4 4 4 6% 8% 63%	8093
	21st to end	Day	3 3 1 4 4 5% 6% 5% 8% 8% 53%	8304
August	1st to 10th	Day	3 2 1 4 4 5% 5% 5% 7% 8% 57%	5909
	11th to 20th	Day	1 2 1 3 3 4 5% 4 6% 7% 64%	5928
	21st to end	Day	5% 3 2 4 3 3 4 3 5% 6% 61%	6503
September	1st to 10th	Day	4 3 1 4 4 4 3 5% 5% 6% 61%	2396
	11th to 20th	Day	5% 5% 2 5% 5% 4 4 4 4 7% 54%	2200
	21st to end	Day	6% 6% 2 4 3 4 3 3 4 7% 59%	2200
October	1st to 10th	Day	5% 6% 2 4 4 4 3 3 4 4 62%	3312
	11th to 20th	Day	3 7% 3 6% 4 4 4 3 4 5% 58%	3250
	21st to end	Day	2 9% 3 8% 5% 5% 6% 5% 6% 8% 43%	3517
November	1st to 10th	Day	5% 14% 5% 9% 5% 4 5% 4 5% 7% 38%	1814
	11th to 20th	Day	3 14% 4 12% 6% 4 5% 3 5% 7% 37%	1680
	21st to end	Day	1 11% 6% 13% 6% 5% 5% 4 5% 6% 39%	1680
December	1st to 10th	Day	1 8% 4 11% 6% 5% 4 3 4 6% 47%	2700
	11th to 20th	Day	2 13% 6% 15% 9% 6% 6% 4 5% 8% 26%	3106
	21st to end	Day	1 14% 6% 15% 8% 6% 5% 5% 7% 8% 25%	4092
January	1st to 10th	Night	1 12% 6% 18% 8% 7% 6% 4 6% 8% 24%	8141
	11th to 20th	Night	1 6% 4 14% 8% 6% 5% 3 4 5% 44%	7650
	21st to end	Night	10% 4 12% 7% 4 4 3 6% 7% 42%	8370
February	1st to 10th	Night	2 13% 7% 16% 8% 6% 6% 5% 6% 6% 26%	2730
	11th to 20th	Night	2 13% 8% 14% 8% 5% 5% 4 4 5% 30%	2662
	21st to end	Night	2 11% 6% 19% 10% 7% 5% 4 5% 6% 26%	2149
March	1st to 10th	Night	1 15% 6% 14% 6% 5% 4 3 5% 6% 36%	5106
	11th to 20th	Night	1 9% 5% 10% 6% 5% 5% 4 5% 7% 44%	5110
	21st to end	Night	3 13% 7% 12% 6% 6% 6% 5% 7% 8% 29%	5610
April	1st to 10th	Night	3 15% 5% 8% 7% 5% 5% 4 6% 8% 35%	2194
	11th to 20th	Night	4 10% 4 10% 6% 5% 4 5% 6% 8% 38%	1934
	21st to end	Night	4 12% 3 8% 5% 4 5% 4 6% 8% 41%	1890
May	1st to 10th	Night	4 10% 3 5% 3 3 4 3 5% 7% 54%	5321
	11th to 20th	Night	4 6% 2 5% 4 4 4 4 6% 8% 53%	5003
	21st to end	Night	5% 6% 2 5% 4 4 4 4 6% 9% 50%	5181
June	1st to 10th	Night	8% 5% 2 5% 4 5% 5% 4 7% 8% 46%	1680
	11th to 20th	Night	8% 5% 1 4 4 3 3 3 6% 9% 55%	1494
	21st to end	Night	3 1 1 3 2 3 3 4 5% 7% 67%	1470
July	1st to 10th	Night	1 1 1 2 2 3 4 4 6% 8% 66%	4140
	11th to 20th	Night	1 1 1 2 2 3 3 4 6% 8% 69%	4857
	21st to end	Night	1 2 1 3 3 4 5% 4 7% 9% 61%	5805
August	1st to 10th	Night	2 2 1 4 3 3 4 3 6% 8% 64%	4123
	11th to 20th	Night	1 2 1 3 3 3 4 3 5% 7% 68%	4141
	21st to end	Night	5% 4 1 4 2 3 3 4 5% 6% 63%	4673
September	1st to 10th	Night	3 3 1 3 2 3 4 3 5% 6% 67%	2000
	11th to 20th	Night	4 4 1 5% 4 4 5% 3 5% 7% 58%	2200
	21st to end	Night	7% 5% 1 4 2 3 3 2 3 6% 65%	2200
October	1st to 10th	Night	4 5% 2 5% 3 3 3 2 3 5% 67%	3878
	11th to 20th	Night	5% 7% 3 6% 4 4 3 3 5% 5% 55%	3898
	21st to end	Night	3 10% 3 7% 4 4 4 4 6% 8% 49%	4278
November	1st to 10th	Night	5% 12% 4 9% 5% 5% 4 4 6% 7% 41%	2681
	11th to 20th	Night	3 12% 4 10% 6% 6% 6% 4 7% 7% 36%	2940
	21st to end	Night	2 10% 5% 10% 5% 5% 5% 4 5% 8% 40%	2940
December	1st to 10th	Night	1 9% 3 11% 6% 6% 4 4 5% 5% 45%	4710
	11th to 20th	Night	1 11% 5% 15% 7% 6% 6% 4 6% 8% 30%	5321
	21st to end	Night	1 14% 6% 15% 8% 6% 6% 5% 6% 8% 24%	7128

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	57% 10% 17% 10% 6%	4841
	11th to 20th	Day	35% 8% 21% 19% 11% 6%	5340
	21st to end	Day	40% 9% 15% 19% 12% 5%	5844
February	1st to 10th	Day	61% 9% 13% 13% 4 1	1890
	11th to 20th	Day	60% 7% 13% 13% 5% 2	1854
	21st to end	Day	62% 6% 8% 17% 6% 2	1655
March	1st to 10th	Day	48% 6% 13% 18% 10% 5%	5007
	11th to 20th	Day	42% 8% 18% 22% 9% 1	5110
	21st to end	Day	60% 11% 13% 13% 3	5607
April	1st to 10th	Day	56% 6% 13% 18% 6% 1	2425
	11th to 20th	Day	54% 6% 14% 18% 8%	2633
	21st to end	Day	52% 9% 14% 20% 5%	2730
May	1st to 10th	Day	32% 8% 16% 32% 12%	7626
	11th to 20th	Day	33% 9% 13% 26% 15% 4	7891
	21st to end	Day	37% 9% 15% 27% 12%	9027
June	1st to 10th	Day	38% 8% 17% 24% 11% 1	2940
	11th to 20th	Day	35% 6% 11% 21% 20% 7%	3119
	21st to end	Day	20% 5% 11% 25% 30% 10%	3150
July	1st to 10th	Day	17% 5% 7% 18% 34% 19%	8746
	11th to 20th	Day	18% 5% 8% 22% 24% 24%	8016
	21st to end	Day	22% 7% 10% 20% 29% 12%	8120
August	1st to 10th	Day	23% 7% 9% 18% 28% 16%	4338
	11th to 20th	Day	18% 7% 8% 23% 33% 10%	4327
	21st to end	Day	19% 4 8% 22% 31% 16%	4722
September	1st to 10th	Day	23% 6% 9% 20% 32% 11%	2396
	11th to 20th	Day	30% 5% 11% 24% 24% 7%	2200
	21st to end	Day	28% 4 12% 28% 23% 5%	2200
October	1st to 10th	Day	28% 3 7% 23% 33% 6%	3312
	11th to 20th	Day	31% 5% 11% 34% 16% 4	3250
	21st to end	Day	37% 9% 17% 25% 11% 1	3517
November	1st to 10th	Day	47% 6% 15% 23% 8% 2	1814
	11th to 20th	Day	47% 8% 18% 19% 7% 1	1680
	21st to end	Day	46% 6% 19% 18% 9% 1	1680
December	1st to 10th	Day	38% 9% 22% 21% 8% 2	2700
	11th to 20th	Day	54% 11% 17% 15% 3	3104
	21st to end	Day	55% 8% 12% 13% 6% 5%	4092
January	1st to 10th	Night	53% 13% 14% 15% 5%	8142
	11th to 20th	Night	39% 9% 20% 21% 7% 4	7650
	21st to end	Night	40% 9% 15% 17% 15% 5%	8370
February	1st to 10th	Night	58% 8% 14% 13% 6%	2730
	11th to 20th	Night	57% 6% 13% 15% 8% 1	2663
	21st to end	Night	58% 5% 11% 16% 7% 2	2149
March	1st to 10th	Night	48% 7% 12% 18% 11% 4	5106
	11th to 20th	Night	33% 11% 19% 28% 9% 1	5110
	21st to end	Night	49% 13% 16% 19% 3	5610
April	1st to 10th	Night	47% 8% 17% 18% 9% 1	2194
	11th to 20th	Night	44% 8% 17% 22% 8% 1	1934
	21st to end	Night	41% 8% 18% 27% 6%	1890
May	1st to 10th	Night	29% 7% 15% 33% 16% 1	5319
	11th to 20th	Night	24% 9% 15% 27% 20% 4	5004
	21st to end	Night	27% 9% 18% 33% 13% 1	5182
June	1st to 10th	Night	34% 10% 17% 26% 11% 2	1680
	11th to 20th	Night	28% 6% 14% 24% 22% 7%	1494
	21st to end	Night	16% 5% 10% 28% 31% 12%	1470
July	1st to 10th	Night	13% 5% 8% 18% 37% 18%	4105
	11th to 20th	Night	11% 5% 9% 21% 32% 22%	4811
	21st to end	Night	18% 5% 10% 20% 30% 17%	5677
August	1st to 10th	Night	20% 5% 8% 20% 32% 15%	3018
	11th to 20th	Night	19% 6% 8% 29% 25% 14%	3018
	21st to end	Night	16% 4 8% 23% 35% 14%	3385
September	1st to 10th	Night	18% 5% 9% 21% 34% 13%	2000
	11th to 20th	Night	25% 7% 11% 24% 26% 8%	2200
	21st to end	Night	24% 4 10% 31% 26% 5%	2200
October	1st to 10th	Night	23% 4 9% 29% 34% 3	3878
	11th to 20th	Night	31% 5% 10% 35% 15% 4	3898
	21st to end	Night	34% 6% 15% 29% 15% 1	4278
November	1st to 10th	Night	44% 6% 15% 24% 10% 2	2681
	11th to 20th	Night	45% 7% 19% 21% 7% 1	2940
	21st to end	Night	42% 8% 18% 20% 10% 2	2940
December	1st to 10th	Night	40% 8% 20% 23% 7% 1	4710
	11th to 20th	Night	49% 9% 22% 16% 4	5322
	21st to end	Night	52% 11% 12% 15% 6% 3	7128

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	8% 17% 22% 35% 15% 2	330
	11th to 20th	Day	3 11% 32% 39% 10% 5%	330
	21st to end	Day	6% 9% 33% 37% 14% 2	363
February	1st to 10th	Day	18% 23% 27% 26% 5%	330
	11th to 20th	Day	10% 20% 32% 28% 8% 1	330
	21st to end	Day	13% 22% 34% 22% 8% 1	371
March	1st to 10th	Day	13% 22% 34% 23% 5% 2	540
	11th to 20th	Day	14% 20% 31% 22% 11% 1	540
	21st to end	Day	16% 22% 31% 24% 6% 1	594
April	1st to 10th	Day	14% 22% 31% 22% 9% 1	540
	11th to 20th	Day	13% 23% 34% 21% 8% 1	532
	21st to end	Day	19% 16% 29% 21% 12% 3	540
May	1st to 10th	Day	10% 18% 31% 27% 11% 2	543
	11th to 20th	Day	15% 14% 27% 27% 15% 2	664
	21st to end	Day	13% 12% 25% 28% 19% 4	844
June	1st to 10th	Day	9% 16% 24% 29% 19% 4	780
	11th to 20th	Day	14% 16% 32% 27% 10% 1	780
	21st to end	Day	7% 12% 28% 30% 19% 4	780
July	1st to 10th	Day	2 7% 26% 39% 22% 4	771
	11th to 20th	Day	3 8% 32% 33% 21% 3	683
	21st to end	Day	4 8% 29% 37% 17% 5%	619
August	1st to 10th	Day	6% 9% 32% 31% 18% 4	567
	11th to 20th	Day	3 8% 32% 30% 19% 9%	557
	21st to end	Day	7% 11% 28% 28% 18% 8%	620
September	1st to 10th	Day	4 9% 30% 25% 24% 8%	530
	11th to 20th	Day	9% 13% 29% 26% 16% 7%	530
	21st to end	Day	8% 12% 27% 27% 18% 7%	530
October	1st to 10th	Day	11% 8% 27% 27% 19% 8%	359
	11th to 20th	Day	9% 16% 23% 24% 19% 8%	330
	21st to end	Day	10% 16% 30% 31% 11% 2	363
November	1st to 10th	Day	10% 17% 32% 28% 8% 5%	330
	11th to 20th	Day	10% 14% 32% 26% 15% 2	330
	21st to end	Day	6% 10% 34% 33% 15% 2	330
December	1st to 10th	Day	10% 13% 27% 34% 15% 2	330
	11th to 20th	Day	13% 17% 29% 29% 12%	330
	21st to end	Day	13% 17% 28% 27% 11% 4	363
January	1st to 10th	Night	7% 10% 31% 37% 14% 1	1029
	11th to 20th	Night	6% 6% 35% 40% 12% 2	840
	21st to end	Night	6% 4 33% 43% 11% 2	924
February	1st to 10th	Night	9% 10% 34% 37% 9% 1	840
	11th to 20th	Night	7% 10% 33% 37% 13% 1	824
	21st to end	Night	8% 11% 34% 35% 11% 1	692
March	1st to 10th	Night	7% 10% 31% 39% 11% 1	840
	11th to 20th	Night	8% 8% 28% 39% 15% 1	840
	21st to end	Night	9% 7% 31% 38% 15%	924
April	1st to 10th	Night	10% 10% 27% 37% 14% 1	724
	11th to 20th	Night	11% 9% 29% 38% 13%	623
	21st to end	Night	11% 6% 25% 37% 19% 2	630
May	1st to 10th	Night	11% 7% 22% 38% 20% 1	630
	11th to 20th	Night	11% 6% 20% 37% 24% 2	621
	21st to end	Night	13% 4 19% 39% 23% 2	683
June	1st to 10th	Night	12% 6% 20% 34% 26% 2	630
	11th to 20th	Night	10% 5% 25% 45% 16%	444
	21st to end	Night	3 2 16% 47% 30% 3	420
July	1st to 10th	Night	1 1 11% 48% 36% 2	410
	11th to 20th	Night	3 1 15% 47% 33% 1	572
	21st to end	Night	2 11% 51% 33% 2	690
August	1st to 10th	Night	5% 1 12% 48% 31% 3	627
	11th to 20th	Night	3 2 12% 46% 35% 2	624
	21st to end	Night	5% 3 16% 39% 33% 4	687
September	1st to 10th	Night	6% 2 13% 43% 34% 3	600
	11th to 20th	Night	6% 2 14% 41% 31% 6%	800
	21st to end	Night	10% 3 13% 42% 27% 5%	800
October	1st to 10th	Night	10% 5% 20% 39% 22% 4	800
	11th to 20th	Night	12% 6% 20% 38% 21% 3	800
	21st to end	Night	8% 6% 22% 48% 13% 3	880
November	1st to 10th	Night	9% 8% 30% 37% 14% 1	836
	11th to 20th	Night	11% 9% 32% 39% 9% 1	1050
	21st to end	Night	8% 8% 30% 40% 13% 2	1050
December	1st to 10th	Night	10% 10% 31% 40% 9% 1	1050
	11th to 20th	Night	10% 10% 30% 39% 10% 1	1050
	21st to end	Night	10% 13% 30% 34% 11% 2	1155

Page generated at 2026-08-27 02:07:13. Version ac07

Copyright © 2026 Attilla Danko.