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 2025-04-26.

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 9% 4 9% 6% 5% 5% 4 6% 7% 43%	118606
	Night	3 9% 4 10% 6% 5% 5% 4 6% 7% 44%	118917
Transparency	Day	39% 7% 13% 20% 16% 6%	118354
	Night	38% 8% 14% 21% 14% 4	118759
Seeing	Day	10% 14% 29% 28% 15% 4	16260
	Night	8% 7% 24% 40% 19% 2	25963

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	1 10% 7% 18% 9% 7% 6% 5% 6% 6% 26%	3728
	11th to 20th	Day	8% 5% 16% 9% 6% 5% 4 5% 6% 36%	4100
	21st to end	Day	1 9% 6% 11% 7% 6% 5% 3 5% 6% 40%	4510
February	1st to 10th	Day	2 18% 7% 17% 8% 5% 6% 4 5% 5% 23%	1800
	11th to 20th	Day	2 16% 8% 15% 9% 6% 5% 4 4 5% 26%	1755
	21st to end	Day	2 15% 8% 20% 8% 7% 4 4 5% 5% 23%	1578
March	1st to 10th	Day	1 13% 6% 13% 7% 5% 5% 3 5% 7% 35%	4899
	11th to 20th	Day	1 9% 6% 13% 7% 6% 5% 4 6% 7% 37%	5000
	21st to end	Day	4 18% 7% 14% 8% 7% 7% 4 5% 5% 20%	5486
April	1st to 10th	Day	5% 17% 4 12% 7% 6% 5% 4 4 7% 28%	2310
	11th to 20th	Day	4 15% 5% 12% 7% 5% 6% 4 5% 6% 30%	2503
	21st to end	Day	7% 16% 5% 10% 6% 5% 5% 4 6% 7% 29%	2537
May	1st to 10th	Day	7% 16% 4 9% 7% 6% 6% 5% 6% 6% 28%	4110
	11th to 20th	Day	5% 5% 2 6% 5% 5% 6% 5% 6% 9% 46%	4222
	21st to end	Day	7% 12% 4 9% 7% 7% 5% 4 6% 6% 33%	4825
June	1st to 10th	Day	8% 8% 3 7% 5% 5% 5% 5% 7% 8% 39%	2660
	11th to 20th	Day	9% 7% 2 6% 5% 4 5% 4 7% 8% 43%	2821
	21st to end	Day	2 2 1 3 4 3 5% 3 5% 7% 64%	2850
July	1st to 10th	Day	2 2 1 2 2 3 4 4 6% 8% 67%	4740
	11th to 20th	Day	2 2 1 4 3 4 5% 4 7% 8% 61%	4333
	21st to end	Day	3 3 1 4 4 4 5% 5% 7% 8% 56%	4454
August	1st to 10th	Day	3 2 2 4 4 5% 5% 5% 7% 8% 55%	4092
	11th to 20th	Day	2 2 1 3 3 4 5% 4 6% 6% 63%	4028
	21st to end	Day	3 2 1 3 3 2 3 3 5% 6% 67%	4464
September	1st to 10th	Day	4 3 2 4 4 4 3 4 4 6% 60%	2276
	11th to 20th	Day	6% 5% 2 5% 5% 4 4 4 4 7% 54%	2090
	21st to end	Day	6% 6% 2 4 3 4 3 3 4 7% 59%	2090
October	1st to 10th	Day	5% 6% 2 4 4 4 3 3 4 4 63%	3211
	11th to 20th	Day	3 7% 3 5% 4 4 3 3 4 5% 58%	3150
	21st to end	Day	2 10% 3 8% 5% 5% 6% 5% 6% 8% 42%	3408
November	1st to 10th	Day	5% 14% 5% 9% 5% 4 5% 4 5% 7% 38%	1726
	11th to 20th	Day	3 14% 5% 13% 6% 4 5% 3 5% 7% 37%	1600
	21st to end	Day	1 10% 6% 14% 6% 5% 5% 4 5% 6% 38%	1600
December	1st to 10th	Day	1 8% 4 11% 6% 5% 4 3 4 6% 48%	2620
	11th to 20th	Day	2 13% 6% 15% 9% 6% 6% 4 5% 8% 25%	3026
	21st to end	Day	1 14% 6% 15% 8% 6% 5% 5% 7% 8% 24%	4004
January	1st to 10th	Night	1 6% 6% 17% 9% 7% 6% 4 7% 8% 28%	6281
	11th to 20th	Night	1 8% 5% 18% 10% 8% 6% 4 4 6% 30%	5880
	21st to end	Night	12% 5% 13% 7% 4 4 3 5% 5% 41%	6468
February	1st to 10th	Night	2 13% 7% 16% 8% 7% 6% 5% 6% 5% 24%	2600
	11th to 20th	Night	2 14% 9% 14% 8% 5% 5% 4 4 5% 30%	2532
	21st to end	Night	1 11% 6% 19% 10% 7% 5% 4 5% 6% 26%	2050
March	1st to 10th	Night	1 15% 6% 13% 6% 5% 4 3 5% 6% 36%	4994
	11th to 20th	Night	1 9% 5% 10% 6% 5% 5% 4 5% 7% 44%	5000
	21st to end	Night	3 13% 7% 13% 6% 6% 6% 5% 7% 7% 29%	5489
April	1st to 10th	Night	3 15% 5% 8% 7% 5% 6% 4 6% 8% 35%	2090
	11th to 20th	Night	5% 10% 4 10% 6% 5% 4 5% 6% 7% 38%	1841
	21st to end	Night	4 12% 3 8% 5% 4 5% 4 6% 8% 42%	1759
May	1st to 10th	Night	6% 16% 4 7% 5% 4 5% 4 6% 7% 36%	2860
	11th to 20th	Night	5% 4 1 5% 4 4 4 4 7% 9% 53%	2681
	21st to end	Night	6% 9% 3 7% 5% 5% 5% 4 6% 9% 41%	2762
June	1st to 10th	Night	8% 5% 2 5% 4 5% 5% 4 7% 8% 45%	1520
	11th to 20th	Night	8% 6% 1 5% 4 3 3 3 6% 9% 53%	1352
	21st to end	Night	3 1 1 2 2 3 3 3 5% 7% 69%	1330
July	1st to 10th	Night	1 1 1 2 2 2 3 3 6% 8% 70%	2220
	11th to 20th	Night	1 1 2 2 2 3 4 6% 8% 70%	2601
	21st to end	Night	1 2 1 2 3 4 4 4 6% 8% 65%	3109
August	1st to 10th	Night	2 2 1 4 3 4 4 4 7% 8% 61%	2847
	11th to 20th	Night	2 2 1 4 3 4 4 3 6% 6% 64%	2811
	21st to end	Night	3 2 1 2 2 2 3 3 4 5% 72%	3203
September	1st to 10th	Night	4 3 1 3 2 3 4 3 4 6% 67%	1900
	11th to 20th	Night	4 4 1 5% 4 4 5% 3 5% 7% 58%	2090
	21st to end	Night	7% 5% 1 4 2 3 3 2 3 5% 64%	2090
October	1st to 10th	Night	4 5% 2 4 3 3 2 1 3 5% 67%	3759
	11th to 20th	Night	5% 7% 3 6% 4 4 3 3 5% 5% 56%	3778
	21st to end	Night	3 10% 3 7% 4 4 4 4 6% 8% 48%	4145
November	1st to 10th	Night	5% 13% 4 9% 5% 5% 4 4 6% 7% 39%	2550
	11th to 20th	Night	3 12% 4 9% 6% 5% 6% 4 7% 7% 36%	2800
	21st to end	Night	2 10% 5% 10% 5% 5% 5% 4 5% 8% 40%	2800
December	1st to 10th	Night	1 9% 3 11% 6% 6% 4 4 5% 5% 46%	4570
	11th to 20th	Night	1 11% 5% 15% 8% 6% 6% 4 6% 8% 29%	5181
	21st to end	Night	1 14% 6% 15% 8% 6% 6% 5% 6% 8% 24%	6974

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	55% 9% 15% 12% 8% 1	3729
	11th to 20th	Day	45% 10% 16% 14% 10% 5%	4100
	21st to end	Day	44% 9% 11% 17% 14% 5%	4510
February	1st to 10th	Day	62% 9% 12% 12% 4 1	1800
	11th to 20th	Day	61% 6% 13% 13% 5% 2	1764
	21st to end	Day	64% 6% 8% 15% 5% 2	1578
March	1st to 10th	Day	48% 6% 13% 18% 9% 5%	4899
	11th to 20th	Day	42% 8% 18% 22% 9% 1	5000
	21st to end	Day	60% 11% 13% 13% 3	5486
April	1st to 10th	Day	58% 6% 12% 16% 7% 1	2310
	11th to 20th	Day	54% 6% 14% 18% 7%	2506
	21st to end	Day	52% 9% 15% 20% 5%	2537
May	1st to 10th	Day	49% 10% 14% 21% 6% 1	4110
	11th to 20th	Day	29% 9% 17% 29% 12% 3	4226
	21st to end	Day	45% 10% 14% 23% 7%	4825
June	1st to 10th	Day	40% 8% 18% 23% 10% 1	2660
	11th to 20th	Day	38% 6% 11% 20% 18% 7%	2821
	21st to end	Day	20% 4 10% 25% 30% 11%	2850
July	1st to 10th	Day	14% 4 7% 18% 38% 19%	4666
	11th to 20th	Day	18% 4 7% 16% 24% 31%	4256
	21st to end	Day	22% 6% 9% 18% 31% 14%	4314
August	1st to 10th	Day	23% 7% 9% 17% 28% 15%	4078
	11th to 20th	Day	18% 6% 8% 23% 34% 11%	4067
	21st to end	Day	18% 4 8% 22% 32% 17%	4463
September	1st to 10th	Day	24% 5% 8% 18% 33% 12%	2276
	11th to 20th	Day	30% 5% 11% 23% 24% 7%	2090
	21st to end	Day	28% 4 12% 29% 22% 5%	2090
October	1st to 10th	Day	28% 3 7% 23% 33% 6%	3211
	11th to 20th	Day	30% 5% 11% 35% 17% 4	3150
	21st to end	Day	38% 9% 18% 24% 11% 1	3408
November	1st to 10th	Day	47% 6% 15% 22% 8% 2	1726
	11th to 20th	Day	47% 8% 18% 19% 7% 1	1600
	21st to end	Day	47% 7% 18% 18% 9% 1	1600
December	1st to 10th	Day	37% 9% 23% 21% 9% 2	2620
	11th to 20th	Day	54% 11% 17% 15% 3	3024
	21st to end	Day	55% 8% 12% 13% 6% 5%	4004
January	1st to 10th	Night	48% 12% 15% 18% 7%	6281
	11th to 20th	Night	50% 12% 12% 17% 6% 3	5880
	21st to end	Night	44% 8% 14% 15% 15% 5%	6468
February	1st to 10th	Night	60% 9% 13% 13% 6%	2600
	11th to 20th	Night	58% 6% 12% 15% 7% 1	2533
	21st to end	Night	60% 5% 12% 15% 7% 2	2050
March	1st to 10th	Night	48% 7% 12% 18% 11% 4	4994
	11th to 20th	Night	33% 11% 18% 28% 8% 1	5000
	21st to end	Night	50% 13% 16% 19% 2	5489
April	1st to 10th	Night	48% 8% 17% 17% 9% 1	2090
	11th to 20th	Night	44% 8% 16% 23% 8% 1	1841
	21st to end	Night	40% 8% 18% 27% 6%	1759
May	1st to 10th	Night	43% 9% 16% 22% 9% 1	2860
	11th to 20th	Night	22% 10% 21% 33% 11% 3	2682
	21st to end	Night	34% 12% 16% 28% 8% 1	2762
June	1st to 10th	Night	35% 10% 18% 27% 10% 1	1520
	11th to 20th	Night	29% 6% 14% 24% 20% 7%	1352
	21st to end	Night	15% 5% 9% 27% 31% 13%	1330
July	1st to 10th	Night	12% 5% 9% 17% 43% 14%	2185
	11th to 20th	Night	10% 4 7% 20% 34% 26%	2555
	21st to end	Night	16% 4 9% 20% 34% 18%	3011
August	1st to 10th	Night	21% 5% 8% 20% 32% 14%	2838
	11th to 20th	Night	19% 6% 7% 28% 26% 14%	2838
	21st to end	Night	15% 4 7% 23% 37% 14%	3203
September	1st to 10th	Night	19% 5% 9% 19% 35% 13%	1900
	11th to 20th	Night	25% 7% 11% 24% 26% 8%	2090
	21st to end	Night	24% 4 10% 31% 26% 5%	2090
October	1st to 10th	Night	23% 4 9% 29% 34% 3	3759
	11th to 20th	Night	31% 5% 10% 35% 16% 4	3778
	21st to end	Night	35% 6% 15% 28% 15% 1	4145
November	1st to 10th	Night	45% 6% 15% 23% 10% 2	2550
	11th to 20th	Night	45% 7% 19% 21% 7% 1	2800
	21st to end	Night	42% 8% 19% 20% 10% 2	2800
December	1st to 10th	Night	40% 8% 20% 24% 7% 1	4570
	11th to 20th	Night	50% 9% 22% 16% 3	5182
	21st to end	Night	52% 11% 12% 15% 6% 3	6974

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	7% 17% 20% 37% 16% 2	300
	11th to 20th	Day	4 11% 29% 39% 11% 5%	300
	21st to end	Day	6% 10% 31% 36% 15% 2	330
February	1st to 10th	Day	19% 25% 27% 25% 4	300
	11th to 20th	Day	10% 20% 32% 28% 9% 1	300
	21st to end	Day	11% 23% 34% 23% 9% 1	342
March	1st to 10th	Day	11% 23% 35% 24% 5% 2	500
	11th to 20th	Day	10% 20% 32% 24% 12% 1	500
	21st to end	Day	15% 21% 31% 25% 7% 1	550
April	1st to 10th	Day	15% 22% 32% 21% 9% 1	500
	11th to 20th	Day	13% 24% 34% 21% 8% 1	492
	21st to end	Day	19% 16% 29% 21% 13% 3	481
May	1st to 10th	Day	11% 21% 31% 25% 10% 2	463
	11th to 20th	Day	14% 13% 26% 27% 17% 2	574
	21st to end	Day	14% 12% 23% 27% 19% 5%	734
June	1st to 10th	Day	9% 15% 22% 29% 21% 5%	680
	11th to 20th	Day	15% 15% 31% 27% 11% 1	680
	21st to end	Day	6% 10% 28% 32% 21% 4	680
July	1st to 10th	Day	3 7% 25% 37% 24% 4	671
	11th to 20th	Day	3 9% 31% 33% 22% 2	591
	21st to end	Day	4 7% 27% 37% 18% 6%	531
August	1st to 10th	Day	7% 7% 30% 32% 20% 5%	487
	11th to 20th	Day	3 8% 30% 30% 20% 10%	477
	21st to end	Day	6% 12% 28% 29% 17% 9%	539
September	1st to 10th	Day	4 10% 31% 24% 23% 8%	490
	11th to 20th	Day	9% 14% 28% 25% 16% 8%	490
	21st to end	Day	8% 12% 27% 27% 19% 6%	490
October	1st to 10th	Day	12% 7% 27% 27% 20% 7%	328
	11th to 20th	Day	10% 14% 21% 25% 21% 9%	300
	21st to end	Day	11% 15% 31% 31% 10% 2	330
November	1st to 10th	Day	9% 16% 32% 28% 9% 6%	300
	11th to 20th	Day	10% 15% 31% 27% 15% 3	300
	21st to end	Day	4 10% 35% 34% 14% 2	300
December	1st to 10th	Day	8% 12% 26% 36% 16% 2	300
	11th to 20th	Day	10% 17% 30% 31% 13%	300
	21st to end	Day	11% 18% 28% 27% 12% 4	330
January	1st to 10th	Night	6% 10% 30% 39% 15% 1	980
	11th to 20th	Night	6% 6% 33% 40% 12% 2	800
	21st to end	Night	7% 4 32% 43% 12% 2	880
February	1st to 10th	Night	10% 10% 33% 37% 9% 1	800
	11th to 20th	Night	7% 10% 33% 36% 13% 1	784
	21st to end	Night	7% 11% 33% 36% 12% 2	660
March	1st to 10th	Night	6% 10% 31% 40% 12% 1	800
	11th to 20th	Night	6% 8% 27% 41% 16% 1	800
	21st to end	Night	10% 7% 29% 39% 15%	880
April	1st to 10th	Night	10% 10% 27% 37% 15% 1	690
	11th to 20th	Night	11% 8% 28% 38% 13%	593
	21st to end	Night	11% 6% 25% 36% 21% 2	587
May	1st to 10th	Night	12% 8% 21% 38% 21% 1	570
	11th to 20th	Night	12% 5% 17% 38% 26% 2	561
	21st to end	Night	14% 5% 18% 37% 24% 2	617
June	1st to 10th	Night	13% 6% 19% 32% 28% 2	570
	11th to 20th	Night	11% 5% 23% 44% 17%	402
	21st to end	Night	3 1 13% 48% 32% 3	380
July	1st to 10th	Night	1 1 11% 46% 39% 2	370
	11th to 20th	Night	3 2 15% 45% 35% 1	516
	21st to end	Night	2 11% 49% 36% 3	624
August	1st to 10th	Night	5% 1 10% 47% 34% 3	567
	11th to 20th	Night	3 1 11% 45% 38% 3	564
	21st to end	Night	5% 2 16% 37% 36% 4	627
September	1st to 10th	Night	6% 2 14% 42% 34% 3	570
	11th to 20th	Night	6% 2 13% 41% 32% 6%	760
	21st to end	Night	10% 3 13% 42% 27% 5%	760
October	1st to 10th	Night	10% 5% 19% 40% 23% 4	760
	11th to 20th	Night	11% 6% 19% 40% 22% 3	760
	21st to end	Night	8% 6% 22% 48% 14% 3	836
November	1st to 10th	Night	10% 8% 28% 38% 15% 2	795
	11th to 20th	Night	10% 10% 31% 39% 9% 1	1000
	21st to end	Night	8% 8% 30% 40% 13% 2	1000
December	1st to 10th	Night	9% 9% 31% 41% 10% 1	1000
	11th to 20th	Night	10% 9% 30% 40% 10% 1	1000
	21st to end	Night	9% 13% 30% 35% 11% 2	1100

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