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 2026-09-29.

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 5% 2 7% 5% 5% 5% 4 7% 8% 47%	159119
	Night	1 4 2 7% 5% 5% 5% 4 7% 9% 50%	149909
Transparency	Day	32% 6% 12% 25% 17% 7%	153880
	Night	29% 7% 16% 27% 17% 5%	146157
Seeing	Day	15% 21% 34% 20% 7% 2	18362
	Night	9% 18% 33% 28% 11% 1	28032

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% 8% 7% 6% 9% 11% 30%	4720
	11th to 20th	Day	1 2 9% 8% 5% 5% 3 5% 7% 56%	5316
	21st to end	Day	2 2 9% 6% 6% 5% 4 5% 8% 52%	5844
February	1st to 10th	Day	5% 5% 13% 9% 8% 8% 6% 9% 8% 29%	1890
	11th to 20th	Day	5% 6% 14% 10% 7% 7% 4 7% 7% 32%	1845
	21st to end	Day	4 4 16% 13% 7% 8% 4 6% 8% 29%	1609
March	1st to 10th	Day	1 8% 4 11% 8% 6% 5% 4 6% 6% 41%	5064
	11th to 20th	Day	5% 3 12% 6% 5% 6% 4 7% 9% 41%	5110
	21st to end	Day	1 11% 4 12% 8% 7% 8% 6% 8% 9% 26%	5607
April	1st to 10th	Day	2 12% 5% 12% 8% 6% 5% 5% 7% 7% 32%	2459
	11th to 20th	Day	2 11% 4 13% 8% 7% 6% 4 7% 8% 31%	2580
	21st to end	Day	4 15% 5% 10% 7% 6% 6% 4 6% 8% 29%	2730
May	1st to 10th	Day	3 10% 4 8% 5% 4 5% 4 6% 8% 42%	7626
	11th to 20th	Day	3 8% 3 7% 4 5% 5% 4 6% 10% 44%	8031
	21st to end	Day	5% 8% 3 8% 5% 5% 6% 5% 7% 9% 40%	9026
June	1st to 10th	Day	7% 8% 3 7% 5% 5% 5% 5% 6% 9% 40%	2940
	11th to 20th	Day	6% 6% 2 6% 4 5% 6% 4 6% 7% 48%	2975
	21st to end	Day	3 2 1 4 4 4 5% 4 6% 8% 59%	3150
July	1st to 10th	Day	2 2 1 4 4 5% 5% 4 8% 8% 58%	8539
	11th to 20th	Day	2 2 1 4 4 5% 5% 4 6% 8% 60%	8190
	21st to end	Day	3 3 1 5% 4 5% 6% 6% 9% 10% 48%	8304
August	1st to 10th	Day	2 2 1 3 3 4 4 4 7% 7% 63%	7549
	11th to 20th	Day	2 2 1 4 4 5% 5% 5% 7% 9% 56%	7565
	21st to end	Day	4 3 1 5% 4 4 5% 4 6% 9% 55%	8169
September	1st to 10th	Day	3 4 2 6% 3 4 3 3 5% 7% 60%	2520
	11th to 20th	Day	6% 4 1 4 3 3 5% 4 6% 8% 56%	2359
	21st to end	Day	6% 5% 2 5% 3 3 3 3 5% 7% 57%	2286
October	1st to 10th	Day	4 7% 2 5% 2 3 4 3 4 4 63%	3270
	11th to 20th	Day	2 7% 2 6% 3 4 4 3 5% 6% 59%	3250
	21st to end	Day	1 7% 4 6% 3 4 4 3 6% 10% 52%	3548
November	1st to 10th	Day	1 8% 4 11% 5% 4 5% 4 6% 8% 44%	1790
	11th to 20th	Day	1 6% 4 10% 6% 5% 5% 4 6% 9% 44%	1680
	21st to end	Day	1 5% 2 9% 6% 7% 5% 5% 6% 8% 47%	1680
December	1st to 10th	Day	3 2 10% 6% 6% 5% 5% 7% 8% 49%	2700
	11th to 20th	Day	3 2 7% 7% 6% 8% 6% 11% 14% 37%	3106
	21st to end	Day	5% 3 10% 7% 7% 7% 6% 10% 12% 33%	4092
January	1st to 10th	Night	2 2 11% 8% 8% 7% 7% 9% 12% 33%	8201
	11th to 20th	Night	1 1 7% 8% 9% 6% 4 5% 7% 51%	7733
	21st to end	Night	2 2 8% 7% 5% 5% 4 8% 9% 48%	8370
February	1st to 10th	Night	3 3 9% 11% 10% 7% 6% 9% 9% 34%	2730
	11th to 20th	Night	4 3 13% 9% 7% 6% 5% 7% 10% 36%	2662
	21st to end	Night	4 3 13% 10% 8% 8% 7% 7% 9% 31%	2191
March	1st to 10th	Night	2 8% 4 10% 8% 6% 6% 4 6% 8% 38%	5050
	11th to 20th	Night	3 2 10% 5% 5% 5% 4 7% 10% 48%	5110
	21st to end	Night	1 8% 4 11% 7% 6% 6% 5% 8% 12% 34%	5610
April	1st to 10th	Night	1 8% 4 9% 7% 5% 6% 4 6% 8% 41%	2160
	11th to 20th	Night	2 7% 3 10% 5% 6% 6% 6% 8% 8% 40%	1985
	21st to end	Night	2 10% 3 10% 7% 5% 4 4 6% 7% 42%	1890
May	1st to 10th	Night	3 11% 4 8% 4 3 3 3 5% 8% 46%	5321
	11th to 20th	Night	3 7% 2 5% 3 4 4 4 5% 9% 55%	4845
	21st to end	Night	3 6% 3 6% 4 5% 5% 4 8% 11% 45%	5181
June	1st to 10th	Night	4 6% 2 6% 4 4 4 4 7% 10% 48%	1680
	11th to 20th	Night	6% 4 1 3 3 3 4 3 7% 10% 57%	1634
	21st to end	Night	2 1 1 2 2 2 4 3 5% 9% 68%	1470
July	1st to 10th	Night	1 1 1 2 2 2 3 4 6% 8% 68%	4414
	11th to 20th	Night	1 1 1 3 2 2 3 3 6% 8% 69%	4795
	21st to end	Night	1 2 1 2 3 3 5% 5% 7% 9% 62%	5805
August	1st to 10th	Night	2 3 1 3 2 3 3 3 4 6% 71%	5273
	11th to 20th	Night	1 1 1 3 3 4 4 4 6% 9% 63%	5291
	21st to end	Night	3 4 1 4 3 3 3 3 6% 10% 60%	6046
September	1st to 10th	Night	3 2 1 4 3 3 4 3 5% 7% 65%	2100
	11th to 20th	Night	4 4 1 4 3 3 4 3 6% 9% 57%	2257
	21st to end	Night	5% 5% 1 4 3 3 3 2 4 6% 65%	2290
October	1st to 10th	Night	3 5% 2 4 3 2 3 2 4 5% 65%	3920
	11th to 20th	Night	2 6% 2 7% 3 4 4 4 6% 7% 56%	3898
	21st to end	Night	1 7% 3 6% 3 4 4 3 6% 9% 54%	4252
November	1st to 10th	Night	1 6% 3 7% 5% 3 4 4 5% 9% 51%	2706
	11th to 20th	Night	5% 2 8% 6% 4 5% 5% 7% 10% 47%	2940
	21st to end	Night	1 3 3 6% 6% 5% 5% 4 8% 9% 50%	2940
December	1st to 10th	Night	2 1 9% 5% 5% 5% 4 7% 9% 52%	4710
	11th to 20th	Night	2 2 7% 6% 6% 7% 6% 10% 13% 40%	5321
	21st to end	Night	4 3 9% 7% 7% 7% 6% 9% 12% 36%	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	41% 8% 19% 19% 12% 1	4723
	11th to 20th	Day	28% 6% 19% 23% 15% 8%	5316
	21st to end	Day	30% 8% 14% 27% 16% 6%	5844
February	1st to 10th	Day	48% 15% 14% 16% 7% 1	1890
	11th to 20th	Day	48% 9% 14% 20% 6% 3	1854
	21st to end	Day	51% 11% 10% 17% 9% 2	1609
March	1st to 10th	Day	42% 6% 9% 24% 13% 6%	5064
	11th to 20th	Day	37% 7% 15% 28% 12% 1	5110
	21st to end	Day	50% 8% 16% 21% 5%	5607
April	1st to 10th	Day	49% 10% 13% 20% 8% 1	2459
	11th to 20th	Day	49% 8% 15% 20% 8%	2583
	21st to end	Day	51% 10% 14% 20% 5%	2730
May	1st to 10th	Day	38% 5% 13% 33% 10%	7626
	11th to 20th	Day	33% 5% 11% 30% 16% 5%	8035
	21st to end	Day	39% 5% 14% 29% 12%	9027
June	1st to 10th	Day	38% 10% 16% 23% 11% 2	2940
	11th to 20th	Day	33% 8% 11% 21% 20% 7%	2975
	21st to end	Day	20% 6% 10% 26% 28% 9%	3150
July	1st to 10th	Day	22% 3 5% 21% 28% 21%	8470
	11th to 20th	Day	21% 3 8% 23% 23% 23%	8115
	21st to end	Day	27% 3 8% 22% 28% 12%	8120
August	1st to 10th	Day	19% 3 5% 16% 28% 29%	5978
	11th to 20th	Day	25% 3 13% 24% 27% 8%	5964
	21st to end	Day	23% 3 13% 24% 25% 11%	6412
September	1st to 10th	Day	24% 5% 8% 19% 33% 11%	2520
	11th to 20th	Day	24% 7% 11% 26% 25% 7%	2359
	21st to end	Day	26% 5% 11% 30% 23% 4	2286
October	1st to 10th	Day	25% 4 6% 22% 33% 10%	3270
	11th to 20th	Day	26% 5% 11% 36% 17% 6%	3250
	21st to end	Day	27% 7% 15% 37% 14% 1	3548
November	1st to 10th	Day	36% 10% 14% 25% 12% 1	1790
	11th to 20th	Day	35% 12% 18% 23% 10% 2	1680
	21st to end	Day	32% 12% 19% 23% 13% 3	1680
December	1st to 10th	Day	31% 11% 19% 25% 11% 3	2700
	11th to 20th	Day	32% 10% 25% 25% 6% 1	3104
	21st to end	Day	37% 7% 12% 27% 9% 9%	4092
January	1st to 10th	Night	37% 8% 17% 25% 11% 1	8202
	11th to 20th	Night	32% 7% 20% 25% 11% 5%	7733
	21st to end	Night	30% 10% 14% 24% 18% 4	8370
February	1st to 10th	Night	40% 16% 16% 19% 7% 1	2730
	11th to 20th	Night	41% 13% 14% 21% 9% 2	2663
	21st to end	Night	44% 14% 12% 19% 9% 3	2191
March	1st to 10th	Night	43% 8% 13% 19% 13% 4	5050
	11th to 20th	Night	27% 8% 19% 36% 9% 1	5110
	21st to end	Night	41% 10% 18% 26% 4	5610
April	1st to 10th	Night	40% 11% 18% 20% 10% 1	2160
	11th to 20th	Night	38% 11% 20% 23% 7% 1	1985
	21st to end	Night	41% 9% 18% 26% 6%	1890
May	1st to 10th	Night	35% 6% 14% 35% 10%	5319
	11th to 20th	Night	27% 4 13% 35% 16% 5%	4846
	21st to end	Night	32% 4 21% 32% 10% 1	5182
June	1st to 10th	Night	29% 11% 21% 26% 10% 2	1680
	11th to 20th	Night	22% 7% 16% 25% 24% 6%	1634
	21st to end	Night	13% 6% 11% 30% 29% 10%	1470
July	1st to 10th	Night	13% 2 7% 26% 39% 14%	4375
	11th to 20th	Night	13% 3 10% 24% 30% 20%	4747
	21st to end	Night	19% 3 11% 25% 30% 13%	5677
August	1st to 10th	Night	16% 3 5% 17% 32% 27%	4168
	11th to 20th	Night	23% 3 17% 30% 20% 8%	4168
	21st to end	Night	15% 3 20% 24% 28% 9%	4734
September	1st to 10th	Night	18% 5% 10% 24% 35% 9%	2100
	11th to 20th	Night	23% 6% 13% 27% 24% 6%	2257
	21st to end	Night	22% 5% 12% 33% 24% 4	2290
October	1st to 10th	Night	21% 5% 9% 28% 32% 5%	3920
	11th to 20th	Night	26% 5% 12% 35% 19% 2	3898
	21st to end	Night	26% 7% 15% 35% 16% 2	4252
November	1st to 10th	Night	29% 11% 16% 29% 13% 2	2706
	11th to 20th	Night	29% 12% 23% 24% 10% 2	2940
	21st to end	Night	27% 12% 20% 26% 11% 4	2940
December	1st to 10th	Night	26% 11% 22% 28% 11% 2	4710
	11th to 20th	Night	30% 12% 27% 25% 7%	5322
	21st to end	Night	35% 8% 15% 24% 10% 8%	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	21% 21% 31% 19% 7% 1	330
	11th to 20th	Day	16% 31% 32% 14% 6% 2	330
	21st to end	Day	13% 30% 38% 14% 4	363
February	1st to 10th	Day	28% 34% 25% 11% 2	330
	11th to 20th	Day	20% 28% 36% 12% 4	330
	21st to end	Day	26% 30% 28% 11% 4 1	325
March	1st to 10th	Day	23% 30% 32% 13% 2	540
	11th to 20th	Day	20% 27% 33% 16% 4	540
	21st to end	Day	21% 28% 35% 13% 3	594
April	1st to 10th	Day	22% 31% 33% 11% 2	540
	11th to 20th	Day	19% 33% 34% 12% 2	532
	21st to end	Day	22% 22% 30% 19% 5% 2	540
May	1st to 10th	Day	16% 23% 34% 18% 8% 1	543
	11th to 20th	Day	16% 17% 34% 22% 9% 2	717
	21st to end	Day	17% 16% 27% 28% 10% 3	844
June	1st to 10th	Day	14% 18% 29% 23% 14% 2	780
	11th to 20th	Day	15% 24% 34% 20% 6% 1	780
	21st to end	Day	7% 19% 36% 25% 11% 2	780
July	1st to 10th	Day	6% 13% 32% 32% 15% 3	771
	11th to 20th	Day	5% 13% 38% 29% 14% 2	747
	21st to end	Day	7% 13% 40% 26% 12% 1	619
August	1st to 10th	Day	8% 15% 43% 23% 9% 1	567
	11th to 20th	Day	4 15% 40% 29% 9% 4	557
	21st to end	Day	10% 16% 40% 22% 9% 3	627
September	1st to 10th	Day	5% 16% 38% 28% 10% 2	570
	11th to 20th	Day	13% 19% 36% 21% 8% 2	570
	21st to end	Day	11% 19% 37% 23% 8% 2	560
October	1st to 10th	Day	13% 16% 35% 24% 11% 1	330
	11th to 20th	Day	22% 19% 30% 18% 9% 3	330
	21st to end	Day	19% 28% 35% 13% 4 1	363
November	1st to 10th	Day	18% 29% 33% 13% 4 2	330
	11th to 20th	Day	18% 28% 34% 17% 2	330
	21st to end	Day	14% 24% 41% 18% 3	330
December	1st to 10th	Day	22% 23% 36% 15% 3 1	330
	11th to 20th	Day	23% 25% 33% 13% 4 1	330
	21st to end	Day	25% 21% 33% 13% 5% 2	363
January	1st to 10th	Night	12% 22% 39% 22% 6% 1	1050
	11th to 20th	Night	11% 28% 36% 16% 7% 2	871
	21st to end	Night	5% 24% 42% 21% 6% 1	924
February	1st to 10th	Night	11% 29% 38% 17% 5% 1	840
	11th to 20th	Night	9% 25% 40% 18% 6% 1	824
	21st to end	Night	14% 27% 36% 16% 5% 1	692
March	1st to 10th	Night	9% 22% 37% 25% 6%	840
	11th to 20th	Night	8% 21% 35% 28% 8%	840
	21st to end	Night	6% 22% 37% 28% 7%	924
April	1st to 10th	Night	10% 21% 37% 24% 7%	690
	11th to 20th	Night	7% 24% 39% 24% 6%	623
	21st to end	Night	8% 18% 34% 27% 12% 1	630
May	1st to 10th	Night	14% 16% 26% 31% 13% 1	630
	11th to 20th	Night	14% 11% 28% 29% 16% 1	621
	21st to end	Night	12% 13% 26% 34% 13% 1	683
June	1st to 10th	Night	9% 14% 28% 29% 19% 1	630
	11th to 20th	Night	9% 18% 34% 30% 9%	584
	21st to end	Night	3 5% 23% 47% 20% 1	420
July	1st to 10th	Night	2 4 21% 48% 23% 1	498
	11th to 20th	Night	2 6% 19% 50% 22% 1	612
	21st to end	Night	2 3 22% 47% 24% 1	690
August	1st to 10th	Night	6% 4 19% 48% 22% 1	627
	11th to 20th	Night	2 4 22% 47% 24% 1	624
	21st to end	Night	4 5% 23% 41% 26% 1	693
September	1st to 10th	Night	3 5% 25% 45% 20% 2	630
	11th to 20th	Night	7% 8% 25% 41% 17% 3	787
	21st to end	Night	9% 9% 24% 39% 18% 2	832
October	1st to 10th	Night	10% 13% 30% 31% 15% 2	800
	11th to 20th	Night	12% 17% 27% 32% 11% 2	800
	21st to end	Night	9% 16% 40% 26% 8% 2	880
November	1st to 10th	Night	9% 23% 38% 23% 6% 1	888
	11th to 20th	Night	13% 23% 39% 20% 4	1050
	21st to end	Night	7% 23% 43% 21% 6%	1050
December	1st to 10th	Night	12% 26% 39% 18% 5%	1050
	11th to 20th	Night	10% 24% 42% 18% 5%	1050
	21st to end	Night	12% 26% 36% 17% 6% 2	1155

Page generated at 2026-09-26 02:18:41. Version ac07

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