Rainsburg Mountain
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rainsburg Mountain clear sky chart from 2005-11-06 to 2024-01-16.

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	14% 8% 3 6% 6% 4 5% 5% 6% 7% 36%	74674
	Night	14% 7% 3 6% 5% 3 5% 5% 6% 7% 39%	75126
Transparency	Day	46% 8% 13% 20% 12% 2	74388
	Night	43% 7% 13% 22% 13% 2	74932
Seeing	Day	22% 16% 26% 21% 11% 4	13699
	Night	19% 14% 25% 28% 12% 1	23400

By Month

Percentage Cloud Cover SE (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	11% 10% 5% 9% 8% 4 6% 5% 5% 6% 30%	1620
	11th to 20th	Day	14% 13% 5% 9% 7% 5% 6% 5% 5% 6% 27%	1665
	21st to end	Day	14% 14% 6% 9% 8% 4 4 4 4 5% 28%	1782
February	1st to 10th	Day	15% 13% 4 8% 9% 3 5% 4 4 6% 29%	1620
	11th to 20th	Day	13% 8% 6% 10% 7% 4 5% 5% 5% 6% 30%	1573
	21st to end	Day	16% 9% 4 11% 6% 3 3 4 4 5% 34%	1481
March	1st to 10th	Day	12% 9% 3 7% 6% 3 4 4 4 6% 41%	1980
	11th to 20th	Day	17% 9% 4 8% 6% 3 4 4 5% 6% 34%	1980
	21st to end	Day	18% 9% 4 7% 6% 3 5% 4 4 7% 34%	2178
April	1st to 10th	Day	14% 10% 5% 7% 5% 3 5% 4 5% 7% 34%	2136
	11th to 20th	Day	14% 9% 3 6% 6% 3 5% 4 4 6% 39%	2134
	21st to end	Day	21% 7% 4 6% 5% 2 4 5% 6% 6% 35%	2249
May	1st to 10th	Day	18% 7% 3 7% 6% 4 5% 5% 6% 7% 31%	2340
	11th to 20th	Day	23% 6% 2 5% 6% 3 4 5% 5% 7% 34%	2344
	21st to end	Day	16% 6% 3 5% 5% 3 5% 6% 6% 9% 36%	2725
June	1st to 10th	Day	13% 5% 3 5% 5% 4 5% 6% 7% 8% 38%	2520
	11th to 20th	Day	12% 6% 3 5% 6% 4 7% 7% 7% 9% 34%	2520
	21st to end	Day	10% 4 3 5% 6% 4 5% 6% 6% 12% 39%	2520
July	1st to 10th	Day	10% 5% 2 6% 6% 5% 6% 5% 6% 9% 40%	2520
	11th to 20th	Day	7% 4 2 5% 6% 4 6% 7% 7% 9% 41%	2373
	21st to end	Day	11% 5% 4 7% 6% 5% 6% 6% 6% 10% 34%	2547
August	1st to 10th	Day	10% 6% 3 6% 6% 4 8% 7% 8% 9% 33%	2327
	11th to 20th	Day	13% 4 2 6% 6% 4 6% 6% 8% 10% 36%	2299
	21st to end	Day	13% 5% 3 5% 6% 4 5% 4 7% 10% 39%	2376
September	1st to 10th	Day	17% 5% 2 4 5% 3 4 6% 5% 7% 42%	2160
	11th to 20th	Day	14% 6% 2 4 4 2 4 4 6% 7% 46%	2093
	21st to end	Day	18% 7% 3 6% 5% 3 5% 4 6% 6% 38%	1918
October	1st to 10th	Day	16% 5% 3 5% 6% 3 5% 5% 4 7% 41%	1800
	11th to 20th	Day	17% 7% 2 7% 6% 3 5% 4 5% 5% 40%	1800
	21st to end	Day	16% 6% 3 6% 6% 3 5% 4 5% 7% 39%	1980
November	1st to 10th	Day	10% 6% 4 6% 4 3 3 4 5% 7% 48%	1829
	11th to 20th	Day	14% 9% 4 5% 5% 3 4 5% 5% 7% 38%	1563
	21st to end	Day	16% 10% 3 6% 6% 3 5% 4 6% 7% 35%	1520
December	1st to 10th	Day	17% 10% 4 8% 7% 4 6% 5% 7% 7% 25%	1520
	11th to 20th	Day	15% 13% 5% 7% 6% 3 4 4 4 6% 33%	1910
	21st to end	Day	18% 12% 5% 9% 7% 4 6% 5% 4 6% 24%	2772
January	1st to 10th	Night	12% 10% 4 7% 8% 4 5% 5% 6% 6% 33%	2543
	11th to 20th	Night	16% 11% 4 8% 6% 4 5% 5% 5% 6% 29%	2406
	21st to end	Night	13% 11% 4 7% 7% 4 5% 5% 5% 6% 32%	2574
February	1st to 10th	Night	14% 9% 4 7% 7% 3 5% 4 6% 7% 34%	2340
	11th to 20th	Night	15% 9% 3 8% 6% 4 5% 5% 6% 7% 31%	2273
	21st to end	Night	14% 10% 5% 8% 7% 3 5% 5% 6% 6% 31%	1769
March	1st to 10th	Night	13% 7% 3 5% 6% 3 4 4 5% 7% 44%	1980
	11th to 20th	Night	17% 8% 3 7% 5% 2 4 4 6% 7% 38%	1980
	21st to end	Night	16% 9% 3 5% 6% 3 4 5% 4 6% 39%	2178
April	1st to 10th	Night	15% 10% 4 6% 6% 4 5% 5% 5% 6% 36%	1823
	11th to 20th	Night	13% 7% 2 5% 6% 3 4 5% 6% 9% 40%	1775
	21st to end	Night	18% 5% 2 5% 4 3 4 4 6% 7% 41%	1726
May	1st to 10th	Night	18% 8% 3 5% 6% 3 5% 5% 6% 6% 35%	1620
	11th to 20th	Night	21% 6% 3 5% 5% 3 4 4 5% 7% 37%	1549
	21st to end	Night	13% 5% 2 4 4 3 5% 5% 6% 10% 43%	1550
June	1st to 10th	Night	12% 4 3 4 5% 2 5% 5% 6% 9% 46%	1440
	11th to 20th	Night	13% 5% 2 6% 5% 3 5% 6% 5% 9% 42%	1440
	21st to end	Night	10% 4 2 4 5% 3 4 5% 8% 12% 44%	1440
July	1st to 10th	Night	9% 5% 2 5% 6% 4 5% 5% 6% 9% 44%	1440
	11th to 20th	Night	6% 4 2 5% 4 3 4 5% 7% 10% 50%	1583
	21st to end	Night	8% 4 2 5% 5% 4 5% 6% 7% 11% 42%	1771
August	1st to 10th	Night	7% 6% 3 5% 6% 4 5% 5% 6% 8% 45%	1611
	11th to 20th	Night	9% 6% 2 7% 6% 2 5% 5% 5% 7% 47%	1598
	21st to end	Night	12% 6% 2 4 4 3 4 4 7% 8% 46%	1966
September	1st to 10th	Night	16% 6% 3 5% 4 3 4 4 5% 5% 47%	1800
	11th to 20th	Night	13% 5% 2 4 4 2 3 4 5% 6% 52%	1863
	21st to end	Night	19% 6% 2 4 4 2 4 5% 5% 6% 43%	2042
October	1st to 10th	Night	16% 6% 3 4 5% 3 4 5% 6% 7% 42%	2160
	11th to 20th	Night	16% 4 2 4 4 3 4 4 5% 7% 45%	2160
	21st to end	Night	18% 5% 2 5% 5% 2 4 4 5% 6% 43%	2376
November	1st to 10th	Night	10% 7% 3 5% 4 3 4 4 5% 5% 50%	2247
	11th to 20th	Night	14% 8% 4 6% 5% 3 4 5% 5% 6% 40%	2614
	21st to end	Night	14% 7% 3 7% 6% 3 6% 5% 5% 6% 37%	2660
December	1st to 10th	Night	16% 11% 5% 7% 5% 3 4 4 6% 7% 31%	2660
	11th to 20th	Night	16% 8% 4 7% 6% 4 5% 5% 5% 6% 33%	3285
	21st to end	Night	17% 12% 4 7% 7% 4 6% 6% 6% 7% 25%	4884

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	51% 8% 12% 21% 8% 1	1621
	11th to 20th	Day	57% 7% 12% 16% 7% 1	1665
	21st to end	Day	58% 5% 12% 15% 8% 2	1782
February	1st to 10th	Day	55% 6% 14% 16% 7% 1	1620
	11th to 20th	Day	54% 5% 13% 19% 8%	1582
	21st to end	Day	52% 6% 12% 17% 10% 3	1481
March	1st to 10th	Day	45% 5% 14% 23% 13% 1	1980
	11th to 20th	Day	50% 7% 11% 18% 11% 3	1980
	21st to end	Day	51% 6% 10% 19% 12% 2	2178
April	1st to 10th	Day	48% 7% 11% 18% 13% 3	2136
	11th to 20th	Day	45% 7% 10% 17% 17% 3	2134
	21st to end	Day	48% 6% 10% 21% 11% 3	2249
May	1st to 10th	Day	50% 8% 12% 18% 12% 1	2340
	11th to 20th	Day	49% 8% 12% 17% 11% 3	2348
	21st to end	Day	44% 9% 15% 20% 11% 1	2725
June	1st to 10th	Day	40% 9% 15% 21% 14% 1	2520
	11th to 20th	Day	42% 11% 14% 19% 13% 1	2520
	21st to end	Day	37% 9% 16% 24% 13% 1	2520
July	1st to 10th	Day	40% 11% 12% 21% 13% 3	2450
	11th to 20th	Day	35% 10% 16% 20% 17% 2	2302
	21st to end	Day	42% 9% 14% 20% 15% 2	2405
August	1st to 10th	Day	41% 13% 16% 20% 10%	2314
	11th to 20th	Day	40% 10% 14% 23% 12% 1	2299
	21st to end	Day	39% 8% 15% 23% 12% 3	2376
September	1st to 10th	Day	41% 8% 13% 19% 16% 4	2160
	11th to 20th	Day	36% 6% 12% 26% 18% 2	2093
	21st to end	Day	45% 7% 13% 17% 16% 1	1918
October	1st to 10th	Day	43% 6% 13% 21% 14% 3	1800
	11th to 20th	Day	45% 6% 11% 25% 13%	1800
	21st to end	Day	44% 6% 12% 23% 14% 2	1980
November	1st to 10th	Day	36% 5% 13% 23% 19% 4	1829
	11th to 20th	Day	44% 6% 13% 20% 15% 3	1563
	21st to end	Day	48% 7% 14% 22% 9% 1	1520
December	1st to 10th	Day	56% 8% 13% 17% 5%	1520
	11th to 20th	Day	52% 6% 12% 24% 6% 1	1906
	21st to end	Day	58% 8% 14% 12% 7%	2772
January	1st to 10th	Night	48% 7% 11% 20% 12% 2	2543
	11th to 20th	Night	54% 8% 14% 17% 6% 1	2406
	21st to end	Night	50% 6% 12% 21% 9% 2	2574
February	1st to 10th	Night	49% 7% 14% 20% 9% 1	2340
	11th to 20th	Night	50% 7% 11% 19% 12% 1	2275
	21st to end	Night	52% 7% 10% 18% 10% 3	1769
March	1st to 10th	Night	40% 6% 13% 26% 14% 1	1980
	11th to 20th	Night	46% 5% 13% 20% 14% 2	1980
	21st to end	Night	46% 6% 13% 18% 14% 3	2178
April	1st to 10th	Night	48% 7% 12% 18% 14% 2	1823
	11th to 20th	Night	39% 8% 12% 21% 16% 4	1775
	21st to end	Night	41% 7% 12% 24% 12% 4	1726
May	1st to 10th	Night	47% 7% 11% 20% 11% 4	1620
	11th to 20th	Night	47% 7% 11% 17% 15% 2	1550
	21st to end	Night	35% 9% 18% 25% 11% 1	1551
June	1st to 10th	Night	35% 8% 12% 27% 17% 1	1440
	11th to 20th	Night	37% 11% 13% 26% 11% 2	1440
	21st to end	Night	31% 10% 17% 25% 15% 1	1440
July	1st to 10th	Night	36% 11% 13% 23% 14% 3	1400
	11th to 20th	Night	29% 10% 15% 27% 17% 2	1532
	21st to end	Night	32% 10% 19% 22% 15% 2	1672
August	1st to 10th	Night	34% 12% 16% 23% 14% 1	1600
	11th to 20th	Night	35% 9% 14% 23% 17% 1	1598
	21st to end	Night	35% 8% 14% 25% 16% 3	1966
September	1st to 10th	Night	39% 6% 13% 21% 18% 3	1800
	11th to 20th	Night	32% 6% 11% 29% 20% 2	1863
	21st to end	Night	40% 7% 12% 23% 17% 2	2042
October	1st to 10th	Night	41% 8% 12% 23% 15% 1	2160
	11th to 20th	Night	36% 7% 13% 26% 16% 1	2160
	21st to end	Night	40% 6% 11% 26% 16% 1	2376
November	1st to 10th	Night	35% 6% 13% 24% 19% 4	2247
	11th to 20th	Night	43% 6% 10% 24% 14% 3	2614
	21st to end	Night	45% 7% 13% 22% 11% 2	2660
December	1st to 10th	Night	50% 6% 14% 20% 8% 1	2660
	11th to 20th	Night	49% 7% 13% 21% 10% 1	3288
	21st to end	Night	54% 9% 17% 13% 6%	4884

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	32% 28% 24% 12% 3	229
	11th to 20th	Day	34% 27% 29% 8% 2	255
	21st to end	Day	30% 29% 27% 11% 3	264
February	1st to 10th	Day	33% 26% 32% 7% 2	240
	11th to 20th	Day	34% 33% 30% 3	240
	21st to end	Day	34% 26% 27% 11% 2	307
March	1st to 10th	Day	28% 22% 28% 20% 2	420
	11th to 20th	Day	30% 26% 26% 13% 4 1	420
	21st to end	Day	30% 21% 30% 13% 5% 1	462
April	1st to 10th	Day	27% 23% 25% 19% 5% 1	420
	11th to 20th	Day	22% 20% 27% 18% 8% 5%	412
	21st to end	Day	33% 17% 27% 14% 6% 2	420
May	1st to 10th	Day	28% 20% 24% 16% 9% 4	423
	11th to 20th	Day	26% 16% 28% 19% 8% 3	447
	21st to end	Day	21% 11% 23% 24% 14% 7%	485
June	1st to 10th	Day	18% 14% 27% 22% 16% 3	450
	11th to 20th	Day	16% 14% 28% 23% 15% 4	450
	21st to end	Day	11% 14% 30% 27% 15% 4	450
July	1st to 10th	Day	12% 7% 22% 29% 19% 10%	445
	11th to 20th	Day	6% 6% 26% 33% 21% 8%	444
	21st to end	Day	14% 7% 26% 30% 18% 6%	488
August	1st to 10th	Day	11% 7% 23% 28% 20% 10%	446
	11th to 20th	Day	15% 5% 23% 28% 20% 11%	439
	21st to end	Day	13% 5% 23% 27% 19% 12%	495
September	1st to 10th	Day	19% 7% 20% 22% 22% 10%	450
	11th to 20th	Day	16% 4 19% 31% 22% 8%	450
	21st to end	Day	23% 12% 25% 22% 15% 4	450
October	1st to 10th	Day	22% 8% 23% 24% 19% 4	450
	11th to 20th	Day	21% 15% 27% 24% 12% 1	450
	21st to end	Day	21% 20% 29% 20% 8% 1	495
November	1st to 10th	Day	15% 17% 29% 25% 12% 2	442
	11th to 20th	Day	25% 21% 25% 24% 5%	223
	21st to end	Day	24% 24% 28% 19% 3 1	180
December	1st to 10th	Day	30% 26% 28% 12% 4 1	180
	11th to 20th	Day	27% 26% 26% 18% 4	180
	21st to end	Day	27% 21% 28% 19% 5%	198
January	1st to 10th	Night	21% 24% 34% 17% 3	760
	11th to 20th	Night	25% 19% 31% 22% 3	741
	21st to end	Night	21% 23% 32% 22% 2	792
February	1st to 10th	Night	24% 20% 31% 24% 2	720
	11th to 20th	Night	24% 28% 32% 16% 1	703
	21st to end	Night	25% 21% 32% 21% 2	592
March	1st to 10th	Night	23% 20% 33% 21% 3	720
	11th to 20th	Night	26% 21% 27% 20% 5% 1	720
	21st to end	Night	23% 17% 34% 19% 5% 1	792
April	1st to 10th	Night	25% 21% 28% 21% 5%	720
	11th to 20th	Night	17% 17% 28% 28% 9%	711
	21st to end	Night	22% 13% 27% 30% 8%	646
May	1st to 10th	Night	22% 12% 23% 29% 13% 1	540
	11th to 20th	Night	23% 9% 23% 34% 11%	488
	21st to end	Night	16% 7% 17% 35% 24% 2	389
June	1st to 10th	Night	13% 5% 24% 37% 21%	360
	11th to 20th	Night	14% 7% 22% 36% 21%	360
	21st to end	Night	11% 4 24% 40% 21% 1	360
July	1st to 10th	Night	10% 4 17% 38% 27% 3	350
	11th to 20th	Night	8% 2 14% 36% 37% 4	488
	21st to end	Night	9% 2 20% 36% 31% 2	591
August	1st to 10th	Night	8% 4 15% 41% 30% 2	537
	11th to 20th	Night	10% 5% 12% 41% 28% 4	534
	21st to end	Night	14% 3 16% 35% 29% 4	778
September	1st to 10th	Night	18% 4 17% 33% 24% 5%	720
	11th to 20th	Night	15% 4 16% 33% 27% 4	720
	21st to end	Night	22% 8% 18% 29% 20% 3	720
October	1st to 10th	Night	19% 7% 22% 30% 21% 2	720
	11th to 20th	Night	19% 13% 26% 31% 11% 1	720
	21st to end	Night	22% 14% 23% 30% 9% 1	792
November	1st to 10th	Night	14% 11% 27% 36% 11% 1	740
	11th to 20th	Night	21% 19% 24% 28% 8% 1	760
	21st to end	Night	20% 18% 28% 28% 6%	760
December	1st to 10th	Night	25% 19% 28% 23% 5%	760
	11th to 20th	Night	22% 18% 31% 26% 3	760
	21st to end	Night	22% 18% 29% 29% 2	836

Page generated at 2024-01-13 01:38:12. Version ac07

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