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 2024-11-01.

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 9% 4 9% 6% 5% 5% 4 6% 7% 42%	102111
	Night	3 9% 4 10% 6% 5% 4 4 6% 7% 43%	97050
Transparency	Day	39% 7% 12% 19% 16% 6%	101859
	Night	40% 7% 14% 20% 14% 5%	96892
Seeing	Day	9% 14% 29% 29% 15% 4	15670
	Night	8% 6% 23% 40% 20% 2	25219

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 12% 8% 21% 10% 6% 5% 4 5% 6% 23%	2600
	11th to 20th	Day	1 12% 7% 18% 9% 6% 5% 3 5% 6% 28%	2860
	21st to end	Day	1 14% 9% 15% 8% 6% 5% 4 5% 6% 27%	3146
February	1st to 10th	Day	2 17% 7% 17% 8% 5% 6% 4 5% 5% 24%	1710
	11th to 20th	Day	2 16% 8% 15% 9% 5% 5% 4 4 5% 27%	1665
	21st to end	Day	2 15% 8% 20% 8% 7% 4 3 5% 5% 22%	1501
March	1st to 10th	Day	1 13% 7% 15% 8% 6% 5% 3 5% 6% 31%	3402
	11th to 20th	Day	1 11% 4 10% 5% 5% 4 3 6% 7% 44%	3490
	21st to end	Day	3 20% 8% 17% 9% 7% 6% 4 5% 6% 15%	3825
April	1st to 10th	Day	6% 18% 4 13% 7% 5% 5% 4 4 7% 27%	2194
	11th to 20th	Day	4 15% 5% 12% 7% 6% 5% 4 6% 6% 29%	2376
	21st to end	Day	7% 16% 5% 10% 6% 5% 5% 4 6% 7% 29%	2470
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	8% 10% 3 6% 5% 5% 4 4 5% 5% 46%	1928
	11th to 20th	Day	5% 10% 3 6% 4 4 4 3 4 5% 50%	1900
	21st to end	Day	3 10% 3 9% 5% 4 5% 5% 5% 7% 44%	2071
November	1st to 10th	Day	5% 15% 5% 9% 5% 4 5% 3 5% 7% 37%	1638
	11th to 20th	Day	3 14% 5% 13% 6% 4 5% 3 5% 6% 37%	1520
	21st to end	Day	1 11% 6% 13% 6% 5% 5% 4 5% 6% 39%	1520
December	1st to 10th	Day	2 13% 6% 15% 8% 7% 5% 3 5% 6% 28%	1520
	11th to 20th	Day	2 15% 6% 16% 8% 6% 6% 5% 5% 9% 22%	1926
	21st to end	Day	1 11% 5% 15% 8% 5% 5% 5% 7% 9% 30%	2794
January	1st to 10th	Night	1 8% 7% 21% 9% 7% 5% 3 6% 8% 24%	4385
	11th to 20th	Night	1 10% 6% 23% 11% 7% 5% 3 4 5% 25%	4110
	21st to end	Night	1 18% 7% 17% 8% 5% 5% 3 6% 5% 25%	4521
February	1st to 10th	Night	2 13% 7% 17% 8% 6% 6% 4 6% 6% 25%	2470
	11th to 20th	Night	2 14% 9% 14% 9% 5% 5% 4 4 5% 30%	2402
	21st to end	Night	1 11% 6% 19% 10% 7% 5% 4 5% 6% 24%	1951
March	1st to 10th	Night	1 12% 6% 16% 8% 6% 5% 4 5% 7% 31%	3471
	11th to 20th	Night	1 8% 4 8% 5% 4 4 3 5% 7% 51%	3490
	21st to end	Night	2 14% 8% 14% 7% 6% 6% 4 7% 7% 25%	3828
April	1st to 10th	Night	3 16% 5% 9% 7% 5% 6% 4 6% 8% 34%	1986
	11th to 20th	Night	5% 11% 4 9% 6% 5% 4 5% 6% 8% 37%	1748
	21st to end	Night	4 12% 3 8% 5% 5% 5% 4 6% 8% 42%	1710
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	7% 8% 3 7% 4 4 4 2 5% 6% 50%	2251
	11th to 20th	Night	6% 9% 3 6% 3 4 3 3 5% 6% 53%	2280
	21st to end	Night	4 9% 3 7% 4 4 4 4 6% 8% 49%	2522
November	1st to 10th	Night	5% 13% 4 9% 5% 5% 4 4 6% 7% 39%	2425
	11th to 20th	Night	3 12% 4 9% 6% 5% 6% 4 6% 7% 37%	2660
	21st to end	Night	2 10% 5% 10% 5% 5% 5% 3 5% 8% 40%	2660
December	1st to 10th	Night	1 15% 5% 14% 8% 7% 5% 5% 5% 6% 30%	2660
	11th to 20th	Night	2 13% 6% 17% 7% 6% 6% 4 6% 8% 25%	3271
	21st to end	Night	1 13% 5% 14% 8% 6% 5% 5% 6% 9% 28%	4873

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	59% 9% 14% 15% 3 1	2601
	11th to 20th	Day	54% 8% 15% 10% 9% 3	2860
	21st to end	Day	56% 10% 13% 13% 7% 1	3146
February	1st to 10th	Day	62% 8% 13% 12% 4 1	1710
	11th to 20th	Day	60% 6% 13% 13% 5% 2	1674
	21st to end	Day	65% 5% 8% 14% 5% 2	1501
March	1st to 10th	Day	52% 6% 13% 16% 11% 1	3402
	11th to 20th	Day	39% 7% 22% 23% 8% 1	3490
	21st to end	Day	66% 12% 11% 9% 2	3825
April	1st to 10th	Day	59% 7% 12% 15% 6% 1	2194
	11th to 20th	Day	56% 6% 14% 17% 7%	2379
	21st to end	Day	53% 8% 14% 20% 4	2470
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	43% 5% 11% 23% 15% 3	1928
	11th to 20th	Day	37% 6% 15% 29% 10% 3	1900
	21st to end	Day	40% 7% 19% 22% 11% 1	2071
November	1st to 10th	Day	49% 6% 15% 21% 8% 2	1638
	11th to 20th	Day	48% 7% 17% 19% 8% 1	1520
	21st to end	Day	47% 7% 18% 18% 10% 1	1520
December	1st to 10th	Day	56% 10% 11% 11% 9% 3	1520
	11th to 20th	Day	56% 10% 15% 15% 4	1924
	21st to end	Day	49% 8% 12% 14% 9% 8%	2794
January	1st to 10th	Night	53% 11% 16% 14% 5%	4385
	11th to 20th	Night	60% 9% 13% 11% 5% 2	4110
	21st to end	Night	58% 9% 14% 12% 6% 1	4521
February	1st to 10th	Night	60% 8% 13% 13% 6%	2470
	11th to 20th	Night	58% 6% 12% 16% 7% 1	2403
	21st to end	Night	62% 5% 11% 14% 6% 2	1951
March	1st to 10th	Night	51% 8% 12% 18% 10%	3471
	11th to 20th	Night	31% 9% 21% 29% 9% 1	3490
	21st to end	Night	53% 14% 16% 15% 2 1	3828
April	1st to 10th	Night	49% 8% 18% 16% 8% 1	1986
	11th to 20th	Night	45% 7% 17% 22% 7% 1	1748
	21st to end	Night	41% 8% 18% 28% 5%	1710
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	36% 5% 14% 25% 17% 2	2251
	11th to 20th	Night	34% 5% 14% 33% 11% 2	2280
	21st to end	Night	35% 7% 18% 28% 12% 1	2522
November	1st to 10th	Night	46% 6% 15% 22% 9% 2	2425
	11th to 20th	Night	45% 7% 19% 20% 7% 1	2660
	21st to end	Night	43% 7% 18% 20% 10% 2	2660
December	1st to 10th	Night	55% 9% 15% 12% 7% 2	2660
	11th to 20th	Night	56% 8% 16% 15% 5%	3272
	21st to end	Night	50% 7% 12% 17% 9% 5%	4873

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% 16% 17% 39% 18% 3	270
	11th to 20th	Day	4 13% 26% 40% 11% 6%	270
	21st to end	Day	6% 10% 30% 35% 16% 2	297
February	1st to 10th	Day	14% 25% 29% 28% 4	270
	11th to 20th	Day	10% 18% 33% 29% 10% 1	270
	21st to end	Day	10% 23% 35% 23% 9% 1	313
March	1st to 10th	Day	12% 24% 35% 25% 4 1	460
	11th to 20th	Day	8% 19% 33% 25% 13% 2	460
	21st to end	Day	14% 21% 33% 25% 7% 1	506
April	1st to 10th	Day	15% 23% 32% 21% 8% 1	460
	11th to 20th	Day	13% 25% 33% 20% 8% 1	452
	21st to end	Day	19% 15% 28% 21% 14% 3	460
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	12% 15% 31% 32% 10% 2	330
November	1st to 10th	Day	10% 17% 31% 27% 9% 6%	270
	11th to 20th	Day	9% 13% 30% 29% 17% 3	270
	21st to end	Day	4 9% 33% 36% 16% 3	270
December	1st to 10th	Day	8% 12% 28% 33% 16% 2	270
	11th to 20th	Day	9% 16% 28% 32% 14%	270
	21st to end	Day	10% 17% 29% 27% 13% 5%	297
January	1st to 10th	Night	6% 9% 28% 39% 16% 1	931
	11th to 20th	Night	7% 6% 32% 40% 12% 2	760
	21st to end	Night	7% 5% 31% 43% 12% 2	836
February	1st to 10th	Night	8% 9% 34% 39% 9% 1	760
	11th to 20th	Night	7% 9% 32% 37% 13% 1	744
	21st to end	Night	7% 11% 32% 36% 12% 2	628
March	1st to 10th	Night	6% 10% 31% 40% 12% 1	760
	11th to 20th	Night	6% 7% 26% 42% 17% 1	760
	21st to end	Night	10% 6% 28% 39% 16%	836
April	1st to 10th	Night	10% 10% 27% 37% 14% 2	656
	11th to 20th	Night	12% 8% 27% 39% 14%	563
	21st to end	Night	11% 5% 24% 37% 21% 2	570
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% 37% 15% 2	756
	11th to 20th	Night	11% 9% 29% 41% 9% 1	950
	21st to end	Night	8% 8% 28% 40% 14% 2	950
December	1st to 10th	Night	9% 9% 31% 40% 10% 1	950
	11th to 20th	Night	10% 9% 29% 41% 11% 1	950
	21st to end	Night	9% 12% 29% 36% 11% 2	1045

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