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 2024-11-02.

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 6% 3 9% 6% 5% 5% 4 6% 8% 44%	101854
	Night	2 5% 2 8% 6% 6% 5% 4 7% 8% 47%	97354
Transparency	Day	36% 8% 12% 20% 16% 7%	101608
	Night	32% 10% 15% 23% 15% 5%	97190
Seeing	Day	14% 22% 34% 21% 8% 2	15708
	Night	8% 18% 32% 29% 12% 1	25477

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 15% 12% 8% 6% 4 6% 8% 35%	2538
	11th to 20th	Day	2 3 13% 12% 8% 6% 4 6% 7% 40%	2836
	21st to end	Day	3 4 14% 8% 6% 6% 5% 6% 8% 40%	3146
February	1st to 10th	Day	5% 5% 13% 9% 8% 8% 6% 9% 8% 29%	1710
	11th to 20th	Day	5% 6% 15% 11% 7% 6% 4 7% 6% 33%	1665
	21st to end	Day	4 4 18% 14% 8% 8% 4 6% 8% 25%	1460
March	1st to 10th	Day	5% 4 14% 11% 7% 6% 4 6% 6% 36%	3444
	11th to 20th	Day	5% 3 12% 6% 5% 5% 4 6% 7% 47%	3490
	21st to end	Day	2 13% 5% 16% 10% 8% 8% 6% 6% 7% 20%	3825
April	1st to 10th	Day	2 13% 5% 13% 9% 6% 5% 5% 6% 7% 29%	2225
	11th to 20th	Day	2 12% 5% 14% 8% 8% 6% 4 7% 8% 29%	2331
	21st to end	Day	4 15% 5% 10% 7% 6% 5% 4 6% 8% 30%	2470
May	1st to 10th	Day	4 17% 5% 13% 8% 6% 6% 4 6% 7% 25%	4110
	11th to 20th	Day	3 9% 3 8% 5% 5% 5% 4 6% 8% 43%	4310
	21st to end	Day	6% 11% 5% 10% 6% 6% 6% 5% 6% 7% 33%	4825
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	6% 12% 3 8% 4 4 4 3 5% 6% 46%	1900
	11th to 20th	Day	3 9% 3 7% 4 4 4 2 5% 7% 53%	1900
	21st to end	Day	2 6% 5% 8% 4 5% 4 3 6% 8% 49%	2090
November	1st to 10th	Day	1 9% 4 12% 5% 4 5% 4 6% 7% 43%	1627
	11th to 20th	Day	1 7% 4 11% 6% 5% 5% 4 6% 9% 43%	1520
	21st to end	Day	1 5% 2 10% 6% 6% 5% 5% 5% 8% 46%	1520
December	1st to 10th	Day	5% 3 11% 8% 7% 6% 5% 8% 9% 38%	1520
	11th to 20th	Day	4 3 11% 9% 7% 7% 6% 10% 10% 34%	1926
	21st to end	Day	5% 4 12% 9% 7% 6% 5% 8% 9% 37%	2794
January	1st to 10th	Night	2 1 11% 11% 10% 6% 5% 8% 9% 35%	4417
	11th to 20th	Night	2 2 11% 13% 11% 8% 5% 6% 7% 36%	4165
	21st to end	Night	3 3 12% 9% 8% 7% 6% 9% 8% 35%	4521
February	1st to 10th	Night	3 3 10% 11% 10% 7% 6% 8% 9% 33%	2470
	11th to 20th	Night	4 3 14% 9% 7% 6% 5% 6% 9% 36%	2402
	21st to end	Night	4 3 14% 11% 8% 9% 7% 6% 8% 29%	1989
March	1st to 10th	Night	5% 3 12% 10% 7% 7% 5% 8% 8% 35%	3430
	11th to 20th	Night	2 2 11% 6% 5% 5% 4 6% 8% 51%	3490
	21st to end	Night	1 8% 4 14% 9% 7% 7% 6% 7% 8% 28%	3828
April	1st to 10th	Night	1 9% 4 10% 7% 5% 5% 5% 6% 8% 39%	1954
	11th to 20th	Night	2 8% 4 10% 6% 6% 6% 5% 8% 8% 38%	1795
	21st to end	Night	2 11% 3 9% 7% 5% 4 4 6% 7% 43%	1710
May	1st to 10th	Night	4 17% 4 9% 5% 4 5% 5% 6% 8% 33%	2860
	11th to 20th	Night	3 6% 3 5% 3 4 4 5% 5% 9% 53%	2593
	21st to end	Night	5% 7% 3 7% 4 6% 5% 4 7% 9% 42%	2762
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	5% 9% 3 7% 5% 4 4 3 6% 7% 47%	2280
	11th to 20th	Night	2 6% 3 7% 4 4 4 4 5% 6% 56%	2280
	21st to end	Night	1 5% 3 7% 4 4 4 3 6% 10% 54%	2508
November	1st to 10th	Night	2 6% 3 8% 5% 4 4 4 5% 9% 50%	2453
	11th to 20th	Night	5% 2 9% 6% 4 5% 5% 7% 9% 48%	2660
	21st to end	Night	1 3 3 6% 6% 5% 5% 5% 8% 9% 49%	2660
December	1st to 10th	Night	3 2 10% 9% 8% 7% 6% 9% 9% 38%	2660
	11th to 20th	Night	3 3 8% 8% 7% 7% 6% 9% 9% 38%	3271
	21st to end	Night	5% 4 11% 8% 6% 6% 4 7% 8% 40%	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	44% 12% 14% 19% 11% 1	2539
	11th to 20th	Day	42% 11% 19% 14% 10% 5%	2836
	21st to end	Day	41% 12% 15% 18% 12% 2	3146
February	1st to 10th	Day	48% 16% 14% 15% 6% 1	1710
	11th to 20th	Day	49% 10% 15% 18% 5% 3	1674
	21st to end	Day	55% 12% 9% 15% 7% 3	1460
March	1st to 10th	Day	47% 8% 12% 17% 14% 1	3444
	11th to 20th	Day	34% 10% 21% 24% 9% 1	3490
	21st to end	Day	61% 10% 15% 11% 2	3825
April	1st to 10th	Day	52% 11% 13% 16% 7% 1	2225
	11th to 20th	Day	52% 8% 15% 19% 6%	2334
	21st to end	Day	51% 10% 14% 21% 4	2470
May	1st to 10th	Day	53% 9% 13% 19% 5% 1	4110
	11th to 20th	Day	35% 8% 17% 27% 11% 3	4314
	21st to end	Day	47% 9% 13% 23% 8%	4825
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	39% 6% 11% 23% 17% 4	1900
	11th to 20th	Day	31% 8% 16% 30% 12% 3	1900
	21st to end	Day	31% 10% 18% 26% 12% 1	2090
November	1st to 10th	Day	38% 11% 14% 23% 12% 2	1627
	11th to 20th	Day	35% 13% 17% 22% 10% 3	1520
	21st to end	Day	33% 13% 18% 21% 12% 3	1520
December	1st to 10th	Day	38% 18% 14% 14% 11% 5%	1520
	11th to 20th	Day	41% 15% 16% 21% 7% 1	1924
	21st to end	Day	40% 10% 8% 17% 11% 13%	2794
January	1st to 10th	Night	41% 12% 16% 19% 11% 1	4417
	11th to 20th	Night	46% 12% 20% 12% 7% 4	4165
	21st to end	Night	43% 14% 14% 19% 9% 2	4521
February	1st to 10th	Night	42% 18% 15% 18% 7% 1	2470
	11th to 20th	Night	43% 14% 14% 18% 8% 2	2403
	21st to end	Night	48% 14% 12% 16% 7% 3	1989
March	1st to 10th	Night	44% 11% 16% 17% 12% 1	3430
	11th to 20th	Night	27% 12% 25% 28% 8% 1	3490
	21st to end	Night	51% 14% 17% 15% 2 1	3828
April	1st to 10th	Night	42% 12% 19% 17% 9% 1	1954
	11th to 20th	Night	40% 12% 20% 22% 5% 1	1795
	21st to end	Night	40% 10% 20% 25% 5%	1710
May	1st to 10th	Night	45% 9% 17% 18% 10% 1	2860
	11th to 20th	Night	26% 8% 20% 34% 10% 2	2594
	21st to end	Night	37% 7% 20% 27% 9% 1	2762
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	35% 8% 15% 24% 16% 2	2280
	11th to 20th	Night	27% 9% 17% 33% 12% 2	2280
	21st to end	Night	26% 10% 22% 28% 13% 1	2508
November	1st to 10th	Night	31% 12% 16% 27% 13% 2	2453
	11th to 20th	Night	30% 13% 23% 22% 10% 2	2660
	21st to end	Night	28% 14% 19% 24% 11% 4	2660
December	1st to 10th	Night	36% 18% 19% 14% 10% 3	2660
	11th to 20th	Night	36% 17% 20% 18% 9%	3272
	21st to end	Night	39% 11% 10% 18% 10% 12%	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	18% 19% 31% 21% 9% 1	270
	11th to 20th	Day	13% 28% 33% 16% 8% 2	270
	21st to end	Day	10% 29% 40% 16% 5%	297
February	1st to 10th	Day	25% 37% 25% 12% 1	270
	11th to 20th	Day	20% 28% 35% 12% 4	270
	21st to end	Day	22% 32% 28% 13% 5% 1	272
March	1st to 10th	Day	21% 32% 32% 13% 2	460
	11th to 20th	Day	14% 27% 36% 19% 5%	460
	21st to end	Day	18% 29% 35% 15% 3	506
April	1st to 10th	Day	22% 33% 32% 11% 2	460
	11th to 20th	Day	19% 35% 32% 12% 3	452
	21st to end	Day	21% 24% 27% 20% 5% 2	460
May	1st to 10th	Day	18% 23% 34% 16% 8% 2	463
	11th to 20th	Day	14% 16% 34% 23% 11% 2	623
	21st to end	Day	18% 16% 25% 27% 11% 3	734
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	20% 28% 36% 12% 4 1	330
November	1st to 10th	Day	19% 29% 32% 14% 4 3	273
	11th to 20th	Day	17% 30% 33% 18% 2	270
	21st to end	Day	12% 24% 39% 22% 3	270
December	1st to 10th	Day	17% 24% 37% 17% 3 1	270
	11th to 20th	Day	20% 24% 34% 16% 5% 1	270
	21st to end	Day	23% 20% 32% 16% 6% 3	297
January	1st to 10th	Night	11% 21% 37% 24% 6% 1	950
	11th to 20th	Night	10% 27% 36% 17% 8% 3	789
	21st to end	Night	5% 22% 43% 23% 6% 1	836
February	1st to 10th	Night	10% 29% 36% 18% 6% 1	760
	11th to 20th	Night	9% 26% 37% 19% 7% 1	744
	21st to end	Night	13% 27% 36% 18% 6% 1	628
March	1st to 10th	Night	9% 23% 37% 26% 6% 1	760
	11th to 20th	Night	6% 20% 34% 30% 9%	760
	21st to end	Night	6% 22% 35% 29% 8%	836
April	1st to 10th	Night	11% 22% 36% 24% 8%	624
	11th to 20th	Night	8% 24% 36% 25% 6% 1	563
	21st to end	Night	8% 18% 32% 28% 13% 1	570
May	1st to 10th	Night	14% 16% 27% 29% 13% 1	570
	11th to 20th	Night	13% 11% 26% 31% 18% 2	561
	21st to end	Night	13% 14% 25% 33% 15% 1	617
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% 27% 8% 2	836
November	1st to 10th	Night	9% 23% 36% 24% 7% 1	805
	11th to 20th	Night	14% 23% 37% 21% 5%	950
	21st to end	Night	7% 22% 42% 23% 6% 1	950
December	1st to 10th	Night	11% 25% 39% 19% 5%	950
	11th to 20th	Night	8% 23% 43% 20% 5% 1	950
	21st to end	Night	12% 26% 34% 19% 7% 2	1045

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