Warm Springs Creek Rd
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Warm Springs Creek Rd clear sky chart from 2005-11-06 to 2025-05-26.

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	2 6% 3 9% 6% 5% 5% 4 6% 8% 45%	118719
	Night	1 4 2 8% 6% 5% 5% 4 7% 9% 48%	119493
Transparency	Day	35% 7% 12% 23% 17% 6%	118473
	Night	30% 9% 15% 26% 16% 4	119329
Seeing	Day	14% 22% 34% 20% 8% 2	16425
	Night	9% 18% 33% 28% 11% 1	26313

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	3 3 13% 10% 7% 7% 5% 8% 11% 34%	3638
	11th to 20th	Day	2 2 11% 10% 7% 6% 4 5% 8% 45%	4076
	21st to end	Day	2 3 11% 7% 7% 5% 4 5% 8% 48%	4510
February	1st to 10th	Day	5% 5% 14% 10% 8% 8% 6% 9% 8% 28%	1800
	11th to 20th	Day	5% 6% 15% 11% 7% 7% 4 7% 7% 32%	1755
	21st to end	Day	4 4 17% 13% 8% 8% 4 7% 8% 27%	1535
March	1st to 10th	Day	1 8% 4 11% 8% 6% 5% 4 6% 6% 41%	4954
	11th to 20th	Day	5% 3 12% 6% 5% 6% 4 7% 9% 41%	5000
	21st to end	Day	1 11% 4 12% 8% 7% 8% 6% 8% 9% 26%	5486
April	1st to 10th	Day	2 12% 5% 12% 8% 6% 5% 5% 7% 7% 31%	2342
	11th to 20th	Day	2 11% 5% 13% 8% 7% 6% 4 7% 8% 30%	2456
	21st to end	Day	5% 15% 5% 10% 7% 6% 5% 4 6% 8% 29%	2600
May	1st to 10th	Day	4 17% 5% 12% 8% 5% 6% 4 6% 7% 26%	4240
	11th to 20th	Day	3 8% 3 8% 5% 5% 5% 5% 7% 9% 43%	4447
	21st to end	Day	5% 11% 5% 10% 6% 5% 6% 5% 6% 7% 33%	4897
June	1st to 10th	Day	7% 9% 3 7% 5% 5% 5% 5% 6% 9% 38%	2660
	11th to 20th	Day	6% 6% 2 7% 5% 5% 6% 5% 6% 7% 45%	2691
	21st to end	Day	3 2 1 5% 4 4 5% 4 6% 7% 60%	2850
July	1st to 10th	Day	2 2 1 3 3 4 4 4 6% 7% 63%	4590
	11th to 20th	Day	2 2 1 5% 4 5% 5% 4 6% 8% 58%	4398
	21st to end	Day	3 3 1 5% 4 5% 5% 5% 7% 8% 52%	4454
August	1st to 10th	Day	4 3 2 5% 5% 4 5% 5% 8% 9% 52%	4092
	11th to 20th	Day	2 2 1 4 3 4 5% 4 6% 7% 61%	4028
	21st to end	Day	3 3 1 3 3 4 4 3 4 6% 66%	4407
September	1st to 10th	Day	3 4 2 6% 4 4 3 3 4 7% 59%	2280
	11th to 20th	Day	6% 4 1 4 3 3 4 3 6% 8% 56%	2135
	21st to end	Day	6% 5% 2 5% 3 3 3 3 5% 7% 58%	2087
October	1st to 10th	Day	4 7% 2 5% 2 3 4 3 3 4 63%	3170
	11th to 20th	Day	2 7% 2 6% 3 3 3 3 5% 6% 60%	3150
	21st to end	Day	1 7% 4 6% 3 4 4 3 6% 10% 52%	3438
November	1st to 10th	Day	1 8% 4 11% 5% 4 5% 4 6% 7% 44%	1703
	11th to 20th	Day	1 7% 4 10% 6% 5% 5% 4 7% 9% 43%	1600
	21st to end	Day	1 5% 2 10% 6% 6% 5% 5% 6% 8% 47%	1600
December	1st to 10th	Day	3 3 10% 6% 6% 5% 5% 7% 7% 50%	2620
	11th to 20th	Day	3 2 7% 7% 7% 8% 6% 11% 13% 36%	3026
	21st to end	Day	5% 3 10% 7% 7% 7% 7% 10% 12% 33%	4004
January	1st to 10th	Night	1 2 10% 9% 8% 6% 6% 8% 11% 39%	6327
	11th to 20th	Night	1 1 9% 10% 11% 7% 5% 6% 8% 41%	5949
	21st to end	Night	2 3 9% 8% 6% 6% 5% 7% 8% 46%	6468
February	1st to 10th	Night	3 3 10% 11% 10% 7% 6% 9% 9% 32%	2600
	11th to 20th	Night	4 3 14% 9% 7% 6% 5% 7% 10% 35%	2532
	21st to end	Night	4 3 14% 11% 8% 9% 7% 7% 8% 30%	2090
March	1st to 10th	Night	2 8% 4 10% 8% 6% 6% 4 6% 8% 39%	4940
	11th to 20th	Night	3 2 10% 5% 5% 5% 4 7% 10% 48%	5000
	21st to end	Night	1 8% 4 11% 7% 6% 6% 5% 8% 12% 33%	5489
April	1st to 10th	Night	1 9% 4 9% 7% 5% 5% 5% 6% 8% 40%	2057
	11th to 20th	Night	2 7% 3 10% 5% 6% 6% 5% 7% 8% 39%	1890
	21st to end	Night	2 10% 3 10% 7% 5% 4 4 6% 7% 42%	1800
May	1st to 10th	Night	4 17% 4 9% 5% 4 4 4 6% 8% 34%	2950
	11th to 20th	Night	3 7% 2 5% 3 4 4 5% 5% 9% 53%	2675
	21st to end	Night	5% 7% 3 7% 4 6% 5% 4 7% 9% 42%	2806
June	1st to 10th	Night	4 5% 2 7% 5% 4 4 4 7% 10% 46%	1520
	11th to 20th	Night	6% 4 1 4 3 3 4 3 7% 10% 55%	1478
	21st to end	Night	2 2 2 2 2 2 3 3 5% 9% 69%	1330
July	1st to 10th	Night	2 2 1 2 2 2 3 3 6% 7% 71%	2368
	11th to 20th	Night	1 1 1 1 2 3 3 6% 8% 73%	2567
	21st to end	Night	1 1 1 2 2 3 4 4 7% 9% 65%	3109
August	1st to 10th	Night	3 6% 2 5% 3 3 3 4 6% 7% 59%	2847
	11th to 20th	Night	2 2 1 4 3 4 5% 4 5% 8% 63%	2811
	21st to end	Night	2 2 1 2 2 2 2 3 4 6% 74%	3259
September	1st to 10th	Night	3 2 1 4 3 3 3 3 5% 7% 66%	1900
	11th to 20th	Night	4 4 1 4 2 3 4 3 6% 8% 59%	2042
	21st to end	Night	5% 6% 1 3 3 2 3 2 3 6% 65%	2092
October	1st to 10th	Night	3 5% 2 4 3 2 3 2 4 5% 66%	3800
	11th to 20th	Night	2 5% 2 7% 3 3 4 4 6% 7% 57%	3778
	21st to end	Night	1 7% 3 6% 3 3 4 3 6% 9% 54%	4120
November	1st to 10th	Night	2 6% 3 8% 5% 3 4 4 5% 9% 50%	2574
	11th to 20th	Night	5% 2 9% 6% 4 5% 5% 7% 9% 47%	2800
	21st to end	Night	1 3 3 6% 6% 5% 5% 4 8% 9% 50%	2800
December	1st to 10th	Night	2 1 9% 5% 5% 5% 4 7% 8% 53%	4570
	11th to 20th	Night	2 2 7% 6% 7% 7% 6% 10% 13% 40%	5181
	21st to end	Night	4 3 9% 7% 7% 7% 6% 9% 12% 36%	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	39% 10% 17% 18% 15% 1	3639
	11th to 20th	Day	37% 8% 16% 19% 13% 7%	4076
	21st to end	Day	33% 10% 11% 23% 16% 6%	4510
February	1st to 10th	Day	49% 16% 14% 15% 6% 1	1800
	11th to 20th	Day	49% 9% 14% 19% 5% 3	1764
	21st to end	Day	53% 11% 10% 15% 8% 3	1535
March	1st to 10th	Day	42% 6% 9% 24% 13% 6%	4954
	11th to 20th	Day	37% 8% 15% 28% 11% 1	5000
	21st to end	Day	51% 8% 17% 21% 4	5486
April	1st to 10th	Day	50% 10% 13% 18% 8% 1	2342
	11th to 20th	Day	50% 8% 15% 20% 7%	2459
	21st to end	Day	51% 10% 15% 20% 4	2600
May	1st to 10th	Day	53% 9% 12% 20% 5% 1	4240
	11th to 20th	Day	34% 8% 16% 28% 11% 3	4451
	21st to end	Day	47% 9% 13% 23% 9%	4897
June	1st to 10th	Day	40% 11% 17% 22% 9% 1	2660
	11th to 20th	Day	36% 9% 11% 20% 18% 7%	2691
	21st to end	Day	20% 7% 10% 26% 28% 10%	2850
July	1st to 10th	Day	18% 5% 7% 17% 31% 22%	4520
	11th to 20th	Day	22% 4 5% 18% 24% 26%	4323
	21st to end	Day	27% 4 6% 20% 33% 11%	4314
August	1st to 10th	Day	26% 5% 7% 20% 28% 14%	4078
	11th to 20th	Day	21% 3 7% 26% 33% 11%	4067
	21st to end	Day	20% 4 7% 21% 32% 16%	4406
September	1st to 10th	Day	25% 5% 8% 18% 33% 10%	2280
	11th to 20th	Day	24% 7% 11% 25% 25% 7%	2135
	21st to end	Day	26% 6% 11% 30% 22% 4	2087
October	1st to 10th	Day	25% 4 6% 22% 33% 10%	3170
	11th to 20th	Day	26% 5% 11% 36% 17% 6%	3150
	21st to end	Day	27% 7% 15% 36% 13% 1	3438
November	1st to 10th	Day	37% 11% 14% 23% 13% 1	1703
	11th to 20th	Day	35% 12% 18% 22% 10% 2	1600
	21st to end	Day	32% 12% 19% 21% 13% 3	1600
December	1st to 10th	Day	31% 11% 19% 25% 11% 3	2620
	11th to 20th	Day	33% 10% 25% 25% 6%	3024
	21st to end	Day	36% 7% 11% 27% 9% 9%	4004
January	1st to 10th	Night	35% 10% 15% 26% 12% 1	6327
	11th to 20th	Night	40% 9% 15% 21% 11% 4	5949
	21st to end	Night	34% 11% 12% 23% 17% 4	6468
February	1st to 10th	Night	42% 17% 15% 18% 7% 1	2600
	11th to 20th	Night	42% 13% 14% 19% 9% 2	2533
	21st to end	Night	46% 14% 12% 17% 8% 3	2090
March	1st to 10th	Night	43% 8% 13% 18% 13% 4	4940
	11th to 20th	Night	27% 8% 18% 36% 9% 1	5000
	21st to end	Night	42% 10% 18% 26% 4	5489
April	1st to 10th	Night	40% 11% 18% 19% 10% 1	2057
	11th to 20th	Night	39% 12% 19% 23% 6% 1	1890
	21st to end	Night	41% 10% 19% 25% 5%	1800
May	1st to 10th	Night	45% 9% 17% 19% 10% 1	2950
	11th to 20th	Night	26% 8% 20% 34% 10% 2	2676
	21st to end	Night	37% 7% 19% 27% 10% 1	2806
June	1st to 10th	Night	30% 12% 23% 26% 9% 1	1520
	11th to 20th	Night	23% 8% 16% 25% 22% 6%	1478
	21st to end	Night	11% 7% 12% 29% 30% 11%	1330
July	1st to 10th	Night	11% 4 8% 27% 40% 10%	2329
	11th to 20th	Night	8% 3 7% 22% 37% 23%	2519
	21st to end	Night	14% 3 6% 29% 34% 13%	3011
August	1st to 10th	Night	23% 4 8% 24% 29% 12%	2838
	11th to 20th	Night	21% 2 7% 34% 25% 11%	2838
	21st to end	Night	13% 4 6% 27% 37% 13%	3259
September	1st to 10th	Night	18% 5% 9% 23% 36% 8%	1900
	11th to 20th	Night	22% 7% 13% 27% 25% 7%	2042
	21st to end	Night	22% 6% 12% 32% 24% 4	2092
October	1st to 10th	Night	21% 5% 9% 28% 33% 5%	3800
	11th to 20th	Night	26% 5% 12% 36% 19% 2	3778
	21st to end	Night	26% 7% 15% 34% 16% 2	4120
November	1st to 10th	Night	30% 11% 16% 27% 13% 2	2574
	11th to 20th	Night	29% 13% 22% 24% 11% 2	2800
	21st to end	Night	28% 13% 20% 25% 11% 4	2800
December	1st to 10th	Night	26% 11% 23% 28% 11% 2	4570
	11th to 20th	Night	30% 12% 27% 24% 7%	5182
	21st to end	Night	35% 8% 14% 24% 10% 8%	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	19% 20% 31% 20% 8% 1	300
	11th to 20th	Day	13% 30% 33% 15% 7% 2	300
	21st to end	Day	12% 28% 40% 15% 5%	330
February	1st to 10th	Day	28% 35% 24% 11% 1	300
	11th to 20th	Day	21% 28% 35% 11% 4	300
	21st to end	Day	24% 31% 28% 12% 5% 1	299
March	1st to 10th	Day	22% 31% 33% 13% 2	500
	11th to 20th	Day	16% 27% 35% 17% 4	500
	21st to end	Day	20% 27% 36% 14% 3	550
April	1st to 10th	Day	21% 32% 33% 11% 3	500
	11th to 20th	Day	19% 34% 33% 12% 2	492
	21st to end	Day	21% 23% 29% 20% 5% 2	500
May	1st to 10th	Day	17% 23% 33% 17% 9% 2	503
	11th to 20th	Day	15% 16% 35% 22% 10% 2	670
	21st to end	Day	18% 17% 25% 27% 10% 3	760
June	1st to 10th	Day	13% 18% 28% 24% 16% 2	680
	11th to 20th	Day	16% 23% 34% 21% 6% 1	680
	21st to end	Day	5% 19% 35% 26% 13% 3	680
July	1st to 10th	Day	6% 13% 31% 30% 17% 3	671
	11th to 20th	Day	4 14% 38% 28% 14% 2	649
	21st to end	Day	7% 14% 37% 27% 14% 2	531
August	1st to 10th	Day	8% 14% 41% 25% 11% 2	487
	11th to 20th	Day	5% 14% 38% 29% 10% 4	477
	21st to end	Day	9% 15% 39% 24% 9% 4	539
September	1st to 10th	Day	5% 16% 38% 29% 11% 3	490
	11th to 20th	Day	14% 19% 34% 22% 8% 2	490
	21st to end	Day	12% 20% 36% 22% 8% 2	487
October	1st to 10th	Day	13% 16% 34% 25% 12% 1	300
	11th to 20th	Day	19% 19% 31% 18% 10% 3	300
	21st to end	Day	19% 28% 36% 12% 4 1	330
November	1st to 10th	Day	17% 29% 33% 14% 4 3	300
	11th to 20th	Day	19% 30% 32% 17% 2	300
	21st to end	Day	13% 24% 40% 20% 3	300
December	1st to 10th	Day	17% 23% 40% 16% 3 1	300
	11th to 20th	Day	20% 25% 35% 15% 5% 1	300
	21st to end	Day	23% 21% 32% 15% 6% 3	330
January	1st to 10th	Night	11% 22% 38% 23% 6% 1	1000
	11th to 20th	Night	10% 27% 36% 17% 8% 2	830
	21st to end	Night	6% 22% 43% 22% 6% 1	880
February	1st to 10th	Night	11% 29% 37% 17% 6% 1	800
	11th to 20th	Night	9% 27% 38% 19% 7% 1	784
	21st to end	Night	12% 27% 37% 17% 6% 1	660
March	1st to 10th	Night	9% 22% 37% 26% 6% 1	800
	11th to 20th	Night	6% 20% 36% 29% 9%	800
	21st to end	Night	6% 22% 35% 29% 7%	880
April	1st to 10th	Night	10% 22% 37% 24% 7%	657
	11th to 20th	Night	8% 24% 38% 24% 6% 1	593
	21st to end	Night	8% 18% 33% 27% 12% 1	600
May	1st to 10th	Night	14% 15% 26% 30% 13% 2	600
	11th to 20th	Night	13% 11% 28% 29% 17% 2	591
	21st to end	Night	13% 14% 26% 32% 15% 1	634
June	1st to 10th	Night	9% 14% 26% 29% 21% 1	570
	11th to 20th	Night	9% 19% 33% 30% 9%	528
	21st to end	Night	2 5% 21% 49% 21% 2	380
July	1st to 10th	Night	2 4 20% 47% 25% 1	449
	11th to 20th	Night	3 7% 19% 49% 22% 1	552
	21st to end	Night	2 3 22% 46% 26% 2	624
August	1st to 10th	Night	7% 3 17% 49% 24% 1	567
	11th to 20th	Night	2 4 20% 46% 26% 1	564
	21st to end	Night	4 5% 22% 40% 27% 1	627
September	1st to 10th	Night	3 5% 22% 45% 21% 3	570
	11th to 20th	Night	6% 8% 24% 41% 18% 3	712
	21st to end	Night	9% 10% 24% 37% 18% 2	760
October	1st to 10th	Night	10% 13% 29% 31% 15% 2	760
	11th to 20th	Night	10% 17% 27% 33% 12% 2	760
	21st to end	Night	9% 16% 39% 26% 8% 2	836
November	1st to 10th	Night	9% 22% 37% 24% 6% 1	845
	11th to 20th	Night	13% 24% 39% 20% 5%	1000
	21st to end	Night	7% 22% 43% 22% 6% 1	1000
December	1st to 10th	Night	11% 25% 40% 18% 5%	1000
	11th to 20th	Night	9% 23% 44% 19% 5% 1	1000
	21st to end	Night	12% 26% 35% 18% 6% 2	1100

Page generated at 2025-05-23 07:20:59. Version ac07

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