Goodnight Ridge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goodnight Ridge clear sky chart from 2005-11-06 to 2024-04-03.

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	15% 8% 3 6% 5% 3 5% 5% 5% 7% 38%	79496
	Night	16% 8% 3 6% 5% 3 4 4 5% 7% 39%	80536
Transparency	Day	45% 6% 10% 22% 14% 2	79211
	Night	45% 5% 10% 21% 15% 3	80341
Seeing	Day	18% 9% 23% 24% 18% 9%	14335
	Night	18% 7% 24% 30% 17% 2	24050

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	15% 15% 6% 7% 6% 3 5% 5% 5% 6% 28%	2595
	11th to 20th	Day	18% 12% 6% 11% 6% 4 5% 3 3 4 26%	2840
	21st to end	Day	28% 14% 7% 6% 4 2 4 3 4 5% 24%	3124
February	1st to 10th	Day	19% 11% 5% 8% 5% 2 4 4 4 7% 32%	1895
	11th to 20th	Day	19% 9% 4 7% 6% 3 4 5% 4 6% 34%	1848
	21st to end	Day	19% 11% 4 7% 5% 3 5% 4 6% 5% 31%	1570
March	1st to 10th	Day	20% 9% 3 6% 3 3 4 5% 4 5% 38%	1900
	11th to 20th	Day	20% 8% 3 6% 6% 3 4 4 5% 7% 34%	2074
	21st to end	Day	18% 10% 4 7% 5% 3 4 4 5% 6% 33%	2300
April	1st to 10th	Day	14% 7% 3 5% 5% 2 5% 5% 6% 7% 41%	2184
	11th to 20th	Day	18% 8% 3 5% 5% 3 4 4 4 6% 40%	2134
	21st to end	Day	18% 8% 2 6% 5% 3 5% 4 5% 6% 37%	2330
May	1st to 10th	Day	19% 6% 2 6% 6% 4 5% 5% 5% 7% 35%	2340
	11th to 20th	Day	18% 7% 3 6% 6% 3 5% 4 6% 7% 36%	2301
	21st to end	Day	9% 5% 3 7% 6% 4 6% 6% 7% 10% 36%	2531
June	1st to 10th	Day	12% 5% 2 6% 5% 4 6% 5% 6% 6% 44%	2340
	11th to 20th	Day	8% 4 2 4 6% 4 7% 6% 7% 9% 43%	2474
	21st to end	Day	9% 5% 2 6% 5% 4 5% 5% 7% 10% 43%	2520
July	1st to 10th	Day	13% 6% 3 6% 6% 4 6% 5% 7% 10% 34%	2520
	11th to 20th	Day	9% 5% 2 6% 6% 3 6% 7% 7% 10% 40%	2407
	21st to end	Day	11% 6% 2 5% 6% 3 6% 6% 7% 9% 39%	2547
August	1st to 10th	Day	11% 5% 2 5% 6% 3 6% 6% 7% 10% 40%	2327
	11th to 20th	Day	10% 5% 3 5% 6% 4 6% 6% 6% 10% 38%	2227
	21st to end	Day	9% 4 2 6% 5% 3 5% 6% 6% 10% 45%	2376
September	1st to 10th	Day	14% 5% 2 5% 5% 2 5% 5% 5% 7% 43%	2070
	11th to 20th	Day	12% 6% 2 4 3 2 4 5% 6% 8% 47%	1980
	21st to end	Day	14% 5% 2 4 5% 2 3 4 5% 7% 49%	1980
October	1st to 10th	Day	11% 4 2 4 4 3 4 4 5% 6% 53%	1980
	11th to 20th	Day	14% 6% 2 5% 5% 2 3 4 4 6% 49%	1877
	21st to end	Day	21% 6% 2 4 4 2 4 4 4 6% 44%	1826
November	1st to 10th	Day	13% 5% 2 4 4 2 3 3 4 6% 55%	1672
	11th to 20th	Day	16% 8% 4 5% 4 3 4 2 4 7% 44%	1710
	21st to end	Day	19% 8% 2 5% 3 2 5% 5% 4 6% 40%	1710
December	1st to 10th	Day	24% 11% 3 7% 5% 2 4 4 5% 4 31%	1710
	11th to 20th	Day	16% 13% 4 7% 7% 2 5% 4 4 6% 33%	2153
	21st to end	Day	20% 16% 5% 6% 6% 4 4 5% 4 6% 24%	3124
January	1st to 10th	Night	17% 17% 5% 8% 6% 3 4 4 4 5% 28%	4256
	11th to 20th	Night	18% 15% 6% 9% 8% 3 4 3 3 4 28%	4120
	21st to end	Night	26% 14% 5% 6% 4 2 3 3 4 5% 28%	4532
February	1st to 10th	Night	22% 10% 5% 8% 5% 3 4 5% 5% 6% 28%	2280
	11th to 20th	Night	20% 8% 4 7% 6% 3 4 3 4 5% 35%	2218
	21st to end	Night	22% 12% 4 7% 5% 3 4 3 4 5% 30%	1884
March	1st to 10th	Night	19% 9% 3 5% 5% 3 3 4 4 5% 39%	2280
	11th to 20th	Night	19% 8% 3 6% 5% 3 4 4 5% 6% 36%	2104
	21st to end	Night	18% 9% 4 6% 6% 3 3 4 4 7% 35%	2299
April	1st to 10th	Night	14% 6% 3 5% 5% 3 4 5% 5% 7% 43%	1834
	11th to 20th	Night	17% 7% 3 6% 4 2 4 4 5% 6% 41%	1775
	21st to end	Night	16% 7% 3 6% 5% 4 4 4 4 6% 39%	1628
May	1st to 10th	Night	18% 7% 3 6% 5% 3 6% 6% 5% 6% 35%	1620
	11th to 20th	Night	15% 5% 3 5% 6% 4 5% 6% 6% 7% 38%	1592
	21st to end	Night	6% 5% 3 5% 6% 4 6% 7% 8% 11% 39%	1744
June	1st to 10th	Night	9% 4 2 5% 4 3 4 4 6% 11% 49%	1620
	11th to 20th	Night	7% 4 2 4 5% 3 4 4 7% 10% 50%	1479
	21st to end	Night	6% 3 2 4 4 4 6% 5% 7% 12% 47%	1440
July	1st to 10th	Night	10% 5% 2 5% 7% 4 6% 5% 6% 9% 42%	1440
	11th to 20th	Night	6% 4 2 5% 4 3 4 5% 7% 11% 48%	1548
	21st to end	Night	9% 3 2 4 5% 3 6% 5% 7% 9% 47%	1771
August	1st to 10th	Night	8% 4 2 4 4 3 4 4 6% 10% 51%	1611
	11th to 20th	Night	7% 4 2 4 5% 3 6% 6% 6% 10% 46%	1670
	21st to end	Night	5% 4 2 4 5% 2 4 4 7% 10% 53%	1980
September	1st to 10th	Night	12% 4 2 4 5% 3 4 4 5% 8% 50%	1872
	11th to 20th	Night	11% 5% 2 4 4 3 4 4 5% 7% 51%	1980
	21st to end	Night	11% 4 2 4 4 3 4 3 4 6% 55%	1980
October	1st to 10th	Night	10% 4 1 5% 4 2 3 4 4 6% 58%	1980
	11th to 20th	Night	16% 5% 3 4 4 3 3 4 4 6% 47%	2081
	21st to end	Night	18% 7% 2 4 5% 2 4 3 4 6% 45%	2528
November	1st to 10th	Night	12% 6% 2 4 5% 2 3 4 5% 5% 51%	2406
	11th to 20th	Night	15% 8% 4 5% 4 2 4 4 4 6% 45%	2470
	21st to end	Night	18% 9% 3 5% 4 2 4 4 4 6% 41%	2470
December	1st to 10th	Night	22% 10% 5% 6% 4 2 4 4 4 6% 32%	2470
	11th to 20th	Night	19% 12% 4 7% 4 3 3 3 5% 5% 34%	3042
	21st to end	Night	19% 15% 4 7% 8% 4 5% 4 4 5% 22%	4532

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	57% 5% 9% 18% 10% 1	2596
	11th to 20th	Day	62% 4 8% 18% 7% 1	2840
	21st to end	Day	64% 3 7% 20% 5% 1	3124
February	1st to 10th	Day	55% 3 7% 21% 11% 2	1895
	11th to 20th	Day	53% 4 8% 21% 11% 3	1858
	21st to end	Day	55% 4 9% 18% 10% 4	1570
March	1st to 10th	Day	48% 5% 9% 21% 15% 2	1900
	11th to 20th	Day	51% 4 11% 19% 12% 2	2074
	21st to end	Day	52% 5% 10% 22% 9% 2	2300
April	1st to 10th	Day	41% 6% 11% 24% 15% 2	2184
	11th to 20th	Day	46% 5% 9% 20% 17% 3	2134
	21st to end	Day	48% 6% 9% 24% 12% 2	2330
May	1st to 10th	Day	48% 7% 11% 23% 10% 1	2340
	11th to 20th	Day	48% 6% 13% 20% 12% 1	2305
	21st to end	Day	42% 9% 16% 20% 12% 2	2531
June	1st to 10th	Day	40% 7% 9% 26% 17% 2	2340
	11th to 20th	Day	35% 9% 14% 24% 17% 2	2474
	21st to end	Day	35% 7% 14% 21% 18% 4	2520
July	1st to 10th	Day	43% 10% 13% 18% 14% 2	2451
	11th to 20th	Day	38% 10% 14% 21% 14% 4	2334
	21st to end	Day	37% 9% 13% 24% 14% 2	2405
August	1st to 10th	Day	38% 8% 14% 24% 14% 1	2314
	11th to 20th	Day	40% 8% 13% 22% 15% 2	2227
	21st to end	Day	34% 9% 13% 25% 16% 4	2376
September	1st to 10th	Day	40% 6% 11% 21% 17% 5%	2070
	11th to 20th	Day	35% 7% 10% 23% 23% 3	1980
	21st to end	Day	36% 4 8% 24% 24% 3	1980
October	1st to 10th	Day	31% 5% 9% 24% 27% 4	1980
	11th to 20th	Day	37% 5% 8% 23% 23% 4	1877
	21st to end	Day	43% 4 8% 25% 17% 3	1826
November	1st to 10th	Day	33% 3 7% 28% 23% 5%	1672
	11th to 20th	Day	43% 3 9% 22% 18% 5%	1710
	21st to end	Day	45% 5% 8% 22% 19% 2	1710
December	1st to 10th	Day	56% 3 10% 20% 9% 1	1710
	11th to 20th	Day	53% 5% 8% 19% 13% 1	2150
	21st to end	Day	61% 5% 11% 16% 7% 1	3124
January	1st to 10th	Night	58% 5% 9% 16% 11% 1	4256
	11th to 20th	Night	61% 4 7% 18% 9% 2	4120
	21st to end	Night	59% 3 8% 19% 10% 1	4532
February	1st to 10th	Night	57% 4 10% 18% 10% 1	2280
	11th to 20th	Night	53% 3 7% 21% 14% 2	2219
	21st to end	Night	58% 4 10% 14% 12% 3	1884
March	1st to 10th	Night	49% 4 6% 19% 19% 3	2280
	11th to 20th	Night	49% 5% 10% 21% 12% 3	2104
	21st to end	Night	50% 5% 11% 23% 10% 2	2299
April	1st to 10th	Night	38% 7% 11% 22% 18% 3	1834
	11th to 20th	Night	44% 4 9% 19% 19% 6%	1775
	21st to end	Night	46% 6% 10% 22% 14% 3	1628
May	1st to 10th	Night	48% 7% 9% 23% 10% 3	1620
	11th to 20th	Night	43% 9% 12% 21% 14% 2	1593
	21st to end	Night	34% 11% 15% 22% 14% 3	1745
June	1st to 10th	Night	31% 6% 14% 26% 18% 4	1620
	11th to 20th	Night	28% 8% 15% 24% 21% 4	1479
	21st to end	Night	30% 8% 17% 23% 16% 6%	1440
July	1st to 10th	Night	38% 9% 11% 23% 15% 4	1400
	11th to 20th	Night	28% 8% 16% 24% 18% 4	1498
	21st to end	Night	32% 9% 16% 26% 16% 2	1672
August	1st to 10th	Night	28% 8% 19% 26% 18% 2	1600
	11th to 20th	Night	32% 9% 13% 26% 17% 2	1670
	21st to end	Night	25% 8% 16% 27% 19% 5%	1980
September	1st to 10th	Night	33% 7% 12% 22% 20% 6%	1872
	11th to 20th	Night	33% 6% 11% 23% 25% 3	1980
	21st to end	Night	32% 6% 6% 26% 25% 5%	1980
October	1st to 10th	Night	28% 4 11% 24% 27% 5%	1980
	11th to 20th	Night	38% 4 8% 22% 23% 3	2081
	21st to end	Night	42% 3 8% 22% 21% 4	2528
November	1st to 10th	Night	35% 4 9% 24% 23% 5%	2406
	11th to 20th	Night	41% 4 7% 21% 21% 6%	2470
	21st to end	Night	47% 4 8% 23% 16% 2	2470
December	1st to 10th	Night	53% 5% 9% 20% 12% 1	2470
	11th to 20th	Night	52% 4 8% 20% 14% 2	3044
	21st to end	Night	64% 5% 10% 14% 8%	4532

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	24% 18% 31% 18% 7% 1	270
	11th to 20th	Day	31% 21% 30% 15% 4	270
	21st to end	Day	26% 19% 36% 15% 3	297
February	1st to 10th	Day	26% 18% 37% 14% 4	270
	11th to 20th	Day	31% 20% 34% 11% 3	270
	21st to end	Day	31% 17% 36% 14% 2	225
March	1st to 10th	Day	27% 15% 39% 14% 4	270
	11th to 20th	Day	22% 16% 39% 16% 7% 1	444
	21st to end	Day	29% 13% 31% 20% 6% 1	506
April	1st to 10th	Day	20% 16% 25% 26% 12% 1	428
	11th to 20th	Day	23% 11% 26% 24% 12% 4	412
	21st to end	Day	22% 11% 30% 23% 10% 4	420
May	1st to 10th	Day	20% 13% 27% 22% 13% 5%	423
	11th to 20th	Day	20% 6% 24% 26% 17% 7%	447
	21st to end	Day	13% 4 19% 29% 20% 14%	485
June	1st to 10th	Day	13% 4 14% 27% 28% 13%	450
	11th to 20th	Day	8% 3 18% 33% 25% 13%	584
	21st to end	Day	11% 4 21% 29% 23% 13%	630
July	1st to 10th	Day	13% 3 13% 24% 25% 22%	621
	11th to 20th	Day	10% 3 16% 26% 29% 16%	507
	21st to end	Day	11% 2 11% 28% 31% 16%	488
August	1st to 10th	Day	12% 3 12% 26% 28% 19%	446
	11th to 20th	Day	13% 3 12% 28% 31% 13%	439
	21st to end	Day	11% 1 9% 27% 29% 23%	495
September	1st to 10th	Day	14% 3 12% 27% 30% 15%	450
	11th to 20th	Day	11% 2 13% 24% 33% 17%	450
	21st to end	Day	16% 5% 17% 26% 25% 11%	450
October	1st to 10th	Day	13% 3 18% 32% 24% 9%	450
	11th to 20th	Day	16% 12% 27% 29% 12% 4	450
	21st to end	Day	21% 11% 33% 22% 13%	341
November	1st to 10th	Day	18% 6% 30% 28% 13% 5%	270
	11th to 20th	Day	24% 13% 29% 25% 7% 1	270
	21st to end	Day	25% 8% 33% 25% 9% 1	270
December	1st to 10th	Day	23% 19% 26% 24% 7% 1	270
	11th to 20th	Day	21% 13% 39% 17% 10%	270
	21st to end	Day	28% 20% 31% 17% 5%	297
January	1st to 10th	Night	24% 14% 32% 26% 4	856
	11th to 20th	Night	29% 14% 33% 21% 4	760
	21st to end	Night	24% 13% 36% 25% 1	836
February	1st to 10th	Night	27% 13% 32% 26% 2	760
	11th to 20th	Night	28% 13% 36% 21% 2	743
	21st to end	Night	28% 13% 39% 18% 2	628
March	1st to 10th	Night	23% 14% 32% 25% 6%	760
	11th to 20th	Night	24% 9% 36% 24% 6%	760
	21st to end	Night	22% 11% 29% 30% 8%	836
April	1st to 10th	Night	16% 10% 33% 33% 8%	560
	11th to 20th	Night	19% 9% 29% 30% 12% 1	533
	21st to end	Night	19% 8% 32% 28% 11% 2	540
May	1st to 10th	Night	21% 6% 26% 30% 15% 2	540
	11th to 20th	Night	16% 5% 21% 35% 20% 4	531
	21st to end	Night	8% 2 17% 36% 30% 6%	584
June	1st to 10th	Night	9% 1 17% 39% 29% 4	540
	11th to 20th	Night	7% 2 15% 42% 30% 4	540
	21st to end	Night	6% 3 16% 43% 30% 3	540
July	1st to 10th	Night	11% 1 10% 29% 39% 10%	525
	11th to 20th	Night	5% 3 11% 33% 42% 7%	522
	21st to end	Night	10% 3 8% 35% 38% 6%	591
August	1st to 10th	Night	9% 1 7% 34% 42% 6%	537
	11th to 20th	Night	8% 1 10% 39% 35% 7%	534
	21st to end	Night	6% 1 7% 34% 48% 5%	594
September	1st to 10th	Night	14% 1 10% 32% 37% 5%	612
	11th to 20th	Night	12% 3 12% 29% 38% 6%	720
	21st to end	Night	12% 4 18% 32% 30% 3	720
October	1st to 10th	Night	11% 4 18% 33% 28% 6%	720
	11th to 20th	Night	19% 5% 25% 33% 16% 1	720
	21st to end	Night	20% 6% 29% 31% 12% 1	792
November	1st to 10th	Night	14% 8% 25% 34% 16% 2	740
	11th to 20th	Night	18% 9% 32% 30% 11%	760
	21st to end	Night	23% 10% 24% 31% 11% 1	760
December	1st to 10th	Night	27% 10% 28% 29% 6%	760
	11th to 20th	Night	24% 10% 33% 24% 8% 1	760
	21st to end	Night	29% 11% 31% 25% 4	836

Page generated at 2024-03-31 06:08:51. Version ac07

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