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 2024-03-06.

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 8% 8% 4 6% 5% 6% 8% 42%	78902
	Night	2 4 3 7% 7% 4 6% 6% 7% 8% 46%	80668
Transparency	Day	38% 10% 13% 20% 14% 5%	78616
	Night	33% 12% 16% 22% 13% 4	80476
Seeing	Day	14% 22% 33% 21% 8% 2	14710
	Night	9% 18% 32% 29% 12% 1	24696

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	2 3 13% 14% 6% 6% 5% 6% 8% 35%	2538
	11th to 20th	Day	2 2 11% 14% 6% 6% 5% 6% 7% 41%	2836
	21st to end	Day	3 4 12% 10% 5% 6% 6% 6% 8% 40%	3146
February	1st to 10th	Day	4 5% 12% 11% 6% 8% 7% 9% 8% 30%	1710
	11th to 20th	Day	4 6% 13% 13% 6% 6% 5% 7% 6% 33%	1665
	21st to end	Day	3 5% 15% 16% 6% 9% 6% 6% 8% 26%	1460
March	1st to 10th	Day	6% 3 11% 12% 5% 7% 6% 7% 8% 35%	2036
	11th to 20th	Day	1 7% 5% 11% 9% 5% 6% 6% 7% 7% 37%	1980
	21st to end	Day	2 10% 6% 14% 11% 5% 7% 6% 6% 8% 26%	2178
April	1st to 10th	Day	2 12% 6% 11% 10% 5% 6% 6% 6% 7% 29%	2107
	11th to 20th	Day	2 11% 6% 12% 10% 6% 7% 5% 6% 8% 28%	2206
	21st to end	Day	5% 15% 5% 9% 8% 5% 5% 5% 6% 8% 30%	2340
May	1st to 10th	Day	6% 12% 5% 10% 9% 4 6% 6% 6% 8% 29%	2340
	11th to 20th	Day	6% 11% 4 9% 7% 4 6% 6% 7% 8% 32%	2428
	21st to end	Day	10% 12% 6% 10% 8% 4 7% 7% 6% 8% 22%	2724
June	1st to 10th	Day	8% 8% 4 6% 6% 4 6% 6% 6% 9% 37%	2520
	11th to 20th	Day	7% 6% 3 6% 6% 4 7% 6% 6% 7% 44%	2549
	21st to end	Day	3 2 1 3 5% 3 5% 5% 6% 8% 60%	2700
July	1st to 10th	Day	3 3 1 5% 5% 4 6% 5% 7% 9% 53%	2615
	11th to 20th	Day	3 3 2 5% 5% 4 5% 5% 5% 7% 58%	2502
	21st to end	Day	5% 4 2 5% 5% 4 5% 4 5% 8% 53%	2545
August	1st to 10th	Day	6% 4 2 5% 6% 4 4 5% 7% 7% 49%	2328
	11th to 20th	Day	3 3 2 4 5% 4 5% 5% 5% 6% 59%	2299
	21st to end	Day	4 4 1 4 5% 3 5% 4 4 7% 58%	2512
September	1st to 10th	Day	4 4 3 5% 5% 3 4 3 4 7% 59%	2160
	11th to 20th	Day	6% 4 1 4 4 2 4 4 6% 8% 57%	2023
	21st to end	Day	6% 5% 2 5% 4 2 3 4 5% 7% 57%	1978
October	1st to 10th	Day	7% 12% 3 7% 5% 3 4 5% 5% 6% 43%	1800
	11th to 20th	Day	3 8% 4 7% 4 3 4 3 5% 7% 52%	1800
	21st to end	Day	2 5% 5% 8% 5% 4 5% 4 6% 8% 49%	1980
November	1st to 10th	Day	2 7% 5% 10% 6% 3 4 6% 6% 7% 44%	1617
	11th to 20th	Day	1 6% 4 10% 6% 4 6% 5% 6% 9% 43%	1520
	21st to end	Day	1 4 2 8% 8% 5% 6% 7% 5% 8% 46%	1520
December	1st to 10th	Day	4 3 10% 8% 5% 7% 6% 8% 10% 38%	1520
	11th to 20th	Day	4 3 10% 10% 5% 8% 8% 9% 10% 34%	1926
	21st to end	Day	5% 4 11% 10% 5% 6% 7% 7% 9% 37%	2794
January	1st to 10th	Night	1 1 9% 13% 8% 7% 7% 8% 10% 35%	4417
	11th to 20th	Night	2 2 9% 14% 9% 9% 7% 6% 7% 36%	4165
	21st to end	Night	3 4 10% 10% 6% 7% 7% 9% 8% 35%	4521
February	1st to 10th	Night	3 3 8% 12% 7% 9% 7% 8% 9% 34%	2470
	11th to 20th	Night	3 4 12% 10% 5% 7% 6% 6% 9% 36%	2402
	21st to end	Night	3 4 12% 12% 6% 10% 9% 6% 8% 29%	1989
March	1st to 10th	Night	6% 4 8% 9% 4 8% 7% 9% 9% 37%	2040
	11th to 20th	Night	1 3 3 8% 7% 4 6% 6% 6% 8% 48%	1980
	21st to end	Night	1 5% 5% 10% 9% 4 6% 7% 7% 9% 37%	2178
April	1st to 10th	Night	2 8% 4 8% 8% 4 6% 6% 6% 8% 40%	1852
	11th to 20th	Night	2 7% 4 9% 7% 5% 7% 6% 8% 8% 38%	1700
	21st to end	Night	2 10% 4 8% 8% 4 5% 5% 5% 7% 44%	1620
May	1st to 10th	Night	6% 12% 3 7% 6% 3 5% 5% 7% 9% 40%	1620
	11th to 20th	Night	5% 10% 3 6% 4 4 5% 6% 6% 10% 41%	1465
	21st to end	Night	8% 6% 3 6% 6% 4 6% 6% 8% 11% 34%	1552
June	1st to 10th	Night	5% 5% 3 6% 5% 3 4 5% 7% 10% 47%	1440
	11th to 20th	Night	7% 4 1 3 4 2 3 4 6% 10% 55%	1401
	21st to end	Night	2 2 2 2 2 2 3 3 5% 9% 69%	1260
July	1st to 10th	Night	1 2 1 2 2 2 4 4 6% 9% 67%	1338
	11th to 20th	Night	1 1 1 2 2 2 3 4 5% 9% 70%	1453
	21st to end	Night	1 2 1 3 3 2 4 3 6% 9% 66%	1773
August	1st to 10th	Night	4 3 2 4 3 3 4 5% 6% 7% 59%	1611
	11th to 20th	Night	2 2 1 3 2 1 3 4 5% 8% 70%	1602
	21st to end	Night	2 3 1 3 3 2 3 5% 5% 7% 65%	1843
September	1st to 10th	Night	3 2 1 4 4 3 4 4 5% 7% 65%	1800
	11th to 20th	Night	4 4 2 4 3 2 3 4 6% 8% 60%	1934
	21st to end	Night	5% 5% 2 3 3 2 3 3 4 6% 64%	1981
October	1st to 10th	Night	6% 9% 4 7% 6% 3 4 4 6% 7% 45%	2160
	11th to 20th	Night	2 6% 3 6% 5% 3 3 5% 5% 6% 56%	2160
	21st to end	Night	1 5% 3 7% 5% 3 4 4 6% 9% 54%	2376
November	1st to 10th	Night	2 5% 5% 6% 6% 2 5% 5% 5% 9% 50%	2441
	11th to 20th	Night	4 3 8% 7% 3 5% 5% 7% 9% 48%	2660
	21st to end	Night	1 3 4 6% 6% 4 5% 6% 8% 9% 49%	2660
December	1st to 10th	Night	2 2 9% 10% 6% 8% 7% 8% 10% 38%	2660
	11th to 20th	Night	3 3 8% 9% 6% 7% 8% 9% 9% 38%	3271
	21st to end	Night	5% 4 10% 9% 5% 6% 5% 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	44% 14% 14% 19% 8% 2	2036
	11th to 20th	Day	41% 15% 16% 17% 9% 2	1980
	21st to end	Day	53% 12% 16% 14% 4 1	2178
April	1st to 10th	Day	52% 11% 13% 15% 7% 1	2107
	11th to 20th	Day	53% 9% 15% 18% 6%	2209
	21st to end	Day	51% 10% 14% 21% 4	2340
May	1st to 10th	Day	51% 8% 16% 19% 6%	2340
	11th to 20th	Day	46% 12% 17% 20% 6%	2432
	21st to end	Day	56% 11% 16% 13% 4	2724
June	1st to 10th	Day	41% 11% 18% 21% 9% 1	2520
	11th to 20th	Day	36% 9% 12% 19% 17% 7%	2549
	21st to end	Day	20% 7% 10% 26% 28% 9%	2700
July	1st to 10th	Day	26% 7% 11% 22% 25% 9%	2545
	11th to 20th	Day	24% 6% 9% 18% 24% 20%	2427
	21st to end	Day	28% 5% 9% 17% 25% 16%	2404
August	1st to 10th	Day	32% 7% 12% 18% 24% 8%	2313
	11th to 20th	Day	25% 5% 9% 24% 28% 9%	2299
	21st to end	Day	25% 5% 10% 20% 30% 10%	2512
September	1st to 10th	Day	26% 6% 8% 17% 33% 11%	2160
	11th to 20th	Day	25% 8% 12% 24% 25% 7%	2023
	21st to end	Day	27% 6% 11% 32% 21% 3	1978
October	1st to 10th	Day	41% 7% 11% 23% 15% 3	1800
	11th to 20th	Day	32% 8% 17% 28% 12% 3	1800
	21st to end	Day	32% 11% 19% 26% 12% 1	1980
November	1st to 10th	Day	38% 12% 15% 23% 12% 2	1617
	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	37% 17% 19% 18% 8% 1	2040
	11th to 20th	Night	30% 15% 22% 24% 9% 1	1980
	21st to end	Night	40% 15% 20% 20% 4 1	2178
April	1st to 10th	Night	41% 12% 19% 17% 10% 1	1852
	11th to 20th	Night	40% 12% 20% 21% 6% 1	1700
	21st to end	Night	39% 10% 20% 25% 5%	1620
May	1st to 10th	Night	38% 9% 18% 26% 8%	1620
	11th to 20th	Night	36% 11% 23% 23% 7%	1466
	21st to end	Night	40% 11% 24% 20% 6%	1552
June	1st to 10th	Night	30% 12% 23% 25% 9% 1	1440
	11th to 20th	Night	24% 8% 17% 23% 21% 6%	1401
	21st to end	Night	11% 7% 12% 30% 30% 9%	1260
July	1st to 10th	Night	13% 6% 14% 30% 28% 9%	1299
	11th to 20th	Night	11% 5% 11% 25% 28% 20%	1405
	21st to end	Night	14% 6% 9% 26% 29% 16%	1674
August	1st to 10th	Night	21% 7% 13% 23% 26% 9%	1602
	11th to 20th	Night	13% 4 11% 34% 29% 9%	1602
	21st to end	Night	18% 7% 8% 24% 33% 10%	1843
September	1st to 10th	Night	19% 6% 9% 21% 36% 9%	1800
	11th to 20th	Night	21% 7% 14% 26% 25% 7%	1934
	21st to end	Night	23% 6% 12% 32% 24% 3	1981
October	1st to 10th	Night	36% 8% 16% 23% 14% 2	2160
	11th to 20th	Night	27% 9% 17% 33% 11% 2	2160
	21st to end	Night	27% 10% 22% 27% 12% 1	2376
November	1st to 10th	Night	31% 12% 16% 26% 13% 2	2441
	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	22% 32% 31% 12% 2	441
	11th to 20th	Day	15% 27% 37% 16% 4	420
	21st to end	Day	17% 30% 35% 15% 3	462
April	1st to 10th	Day	22% 33% 31% 10% 2	420
	11th to 20th	Day	20% 36% 30% 12% 2	412
	21st to end	Day	22% 24% 27% 20% 5% 2	420
May	1st to 10th	Day	16% 23% 34% 16% 8% 2	423
	11th to 20th	Day	15% 16% 33% 23% 11% 2	575
	21st to end	Day	18% 16% 24% 28% 11% 3	679
June	1st to 10th	Day	13% 18% 27% 24% 17% 2	630
	11th to 20th	Day	15% 23% 33% 22% 7% 1	630
	21st to end	Day	4 18% 35% 27% 13% 3	630
July	1st to 10th	Day	6% 11% 31% 31% 18% 3	621
	11th to 20th	Day	5% 15% 37% 28% 14% 2	600
	21st to end	Day	6% 14% 37% 28% 14% 2	487
August	1st to 10th	Day	8% 14% 40% 26% 11% 2	447
	11th to 20th	Day	4 13% 38% 30% 11% 5%	437
	21st to end	Day	9% 14% 39% 25% 9% 4	495
September	1st to 10th	Day	5% 17% 38% 29% 9% 2	450
	11th to 20th	Day	14% 19% 33% 23% 9% 3	450
	21st to end	Day	12% 20% 36% 21% 8% 2	448
October	1st to 10th	Day	14% 14% 33% 26% 12% 1	270
	11th to 20th	Day	21% 19% 31% 18% 9% 3	270
	21st to end	Day	19% 27% 36% 13% 4 1	297
November	1st to 10th	Day	19% 29% 32% 13% 4 3	270
	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% 25% 6% 1	742
	11th to 20th	Night	6% 21% 34% 30% 9%	720
	21st to end	Night	6% 22% 35% 29% 8%	792
April	1st to 10th	Night	11% 22% 35% 24% 8%	592
	11th to 20th	Night	8% 24% 37% 25% 6% 1	533
	21st to end	Night	7% 18% 32% 27% 14% 1	540
May	1st to 10th	Night	14% 15% 26% 29% 14% 1	540
	11th to 20th	Night	13% 11% 26% 30% 19% 2	531
	21st to end	Night	13% 13% 24% 33% 15% 1	584
June	1st to 10th	Night	8% 15% 25% 29% 22% 1	540
	11th to 20th	Night	9% 18% 32% 31% 10%	501
	21st to end	Night	2 5% 20% 49% 22% 2	360
July	1st to 10th	Night	2 4 20% 46% 26% 1	424
	11th to 20th	Night	3 7% 19% 48% 22% 1	522
	21st to end	Night	2 3 21% 46% 26% 2	591
August	1st to 10th	Night	6% 3 17% 49% 25% 1	537
	11th to 20th	Night	2 4 18% 46% 28% 1	534
	21st to end	Night	5% 5% 20% 41% 28% 1	594
September	1st to 10th	Night	4 6% 23% 44% 21% 3	540
	11th to 20th	Night	6% 8% 23% 41% 19% 3	674
	21st to end	Night	9% 10% 23% 37% 19% 2	720
October	1st to 10th	Night	10% 14% 29% 30% 16% 2	720
	11th to 20th	Night	10% 18% 27% 32% 11% 2	720
	21st to end	Night	9% 16% 37% 28% 8% 2	792
November	1st to 10th	Night	9% 23% 36% 25% 7% 1	801
	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

Page generated at 2024-03-03 04:28:54. Version ac07

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