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 2024-11-04.

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 7% 4 4 4 4 5% 7% 38%	101445
	Night	15% 9% 3 6% 4 4 4 3 5% 7% 40%	97458
Transparency	Day	43% 5% 10% 23% 16% 2	105155
	Night	42% 5% 10% 22% 17% 3	101887
Seeing	Day	18% 9% 24% 24% 17% 8%	15214
	Night	18% 7% 25% 30% 18% 2	24756

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% 16% 6% 8% 4 4 5% 4 5% 5% 27%	2595
	11th to 20th	Day	18% 12% 6% 13% 5% 6% 4 3 3 4 26%	2840
	21st to end	Day	27% 15% 7% 6% 3 3 3 3 4 5% 24%	3124
February	1st to 10th	Day	19% 12% 4 9% 4 3 4 3 4 6% 32%	1895
	11th to 20th	Day	18% 10% 3 8% 5% 4 4 4 4 6% 34%	1848
	21st to end	Day	19% 12% 4 7% 5% 4 5% 3 6% 4 31%	1570
March	1st to 10th	Day	26% 13% 3 7% 3 3 4 3 3 5% 32%	3120
	11th to 20th	Day	15% 6% 2 5% 4 4 3 3 5% 7% 45%	3464
	21st to end	Day	14% 9% 2 7% 5% 4 4 3 6% 7% 38%	3828
April	1st to 10th	Day	15% 8% 3 6% 4 3 5% 4 6% 7% 40%	2280
	11th to 20th	Day	18% 9% 2 5% 4 4 4 3 4 6% 41%	2254
	21st to end	Day	17% 8% 2 6% 5% 5% 4 4 6% 6% 38%	2460
May	1st to 10th	Day	21% 8% 2 8% 5% 5% 4 4 6% 7% 30%	4082
	11th to 20th	Day	19% 7% 3 7% 4 3 4 3 5% 6% 38%	4081
	21st to end	Day	12% 6% 2 7% 5% 5% 5% 4 7% 9% 37%	4476
June	1st to 10th	Day	12% 5% 2 6% 4 5% 5% 3 7% 6% 43%	2470
	11th to 20th	Day	8% 4 2 5% 6% 6% 6% 5% 7% 9% 43%	2612
	21st to end	Day	9% 5% 2 6% 5% 5% 5% 4 7% 10% 42%	2660
July	1st to 10th	Day	12% 7% 3 7% 5% 6% 4 4 7% 9% 38%	4440
	11th to 20th	Day	8% 5% 2 6% 5% 5% 5% 5% 7% 10% 44%	4229
	21st to end	Day	14% 10% 4 9% 7% 6% 6% 5% 7% 7% 25%	4466
August	1st to 10th	Day	8% 4 2 5% 4 4 5% 4 7% 11% 47%	4104
	11th to 20th	Day	9% 5% 2 6% 4 5% 6% 5% 7% 10% 38%	3898
	21st to end	Day	5% 3 2 5% 4 4 5% 4 6% 9% 53%	4180
September	1st to 10th	Day	14% 6% 2 6% 5% 4 5% 4 5% 7% 44%	2185
	11th to 20th	Day	12% 6% 2 5% 3 3 4 4 6% 8% 47%	2090
	21st to end	Day	15% 6% 2 5% 5% 3 4 3 5% 6% 46%	2090
October	1st to 10th	Day	11% 4 2 5% 3 3 4 4 5% 6% 55%	2090
	11th to 20th	Day	13% 6% 2 6% 4 3 3 3 4 6% 50%	1981
	21st to end	Day	20% 6% 2 5% 3 3 3 4 4 5% 45%	1927
November	1st to 10th	Day	12% 6% 1 5% 3 3 3 2 4 6% 55%	1699
	11th to 20th	Day	16% 9% 3 5% 4 4 4 2 4 6% 43%	1710
	21st to end	Day	19% 9% 2 6% 3 3 5% 4 4 6% 40%	1710
December	1st to 10th	Day	23% 12% 3 7% 5% 3 4 3 5% 4 31%	1710
	11th to 20th	Day	16% 13% 4 8% 6% 4 5% 3 4 6% 32%	2153
	21st to end	Day	20% 16% 4 8% 4 4 5% 4 5% 6% 24%	3124
January	1st to 10th	Night	17% 17% 5% 9% 5% 4 4 3 4 5% 28%	4256
	11th to 20th	Night	18% 15% 6% 10% 6% 4 3 2 3 4 28%	4120
	21st to end	Night	25% 15% 4 6% 4 3 3 3 4 5% 28%	4532
February	1st to 10th	Night	22% 11% 5% 8% 4 4 4 4 5% 6% 28%	2280
	11th to 20th	Night	20% 10% 4 8% 4 3 4 2 4 5% 35%	2218
	21st to end	Night	22% 13% 4 8% 4 4 3 3 4 5% 30%	1884
March	1st to 10th	Night	24% 14% 3 6% 4 3 3 3 4 5% 31%	3733
	11th to 20th	Night	15% 7% 2 5% 3 4 3 3 5% 5% 47%	3494
	21st to end	Night	15% 8% 2 6% 5% 5% 4 4 5% 6% 41%	3817
April	1st to 10th	Night	14% 7% 2 5% 5% 4 4 4 5% 7% 43%	1914
	11th to 20th	Night	16% 7% 3 7% 4 3 4 4 5% 6% 41%	1875
	21st to end	Night	16% 8% 3 7% 5% 5% 4 3 4 6% 39%	1718
May	1st to 10th	Night	21% 9% 3 8% 5% 5% 6% 4 5% 6% 28%	2813
	11th to 20th	Night	18% 6% 2 5% 4 3 4 4 7% 7% 40%	2812
	21st to end	Night	8% 5% 2 6% 5% 5% 6% 5% 7% 9% 42%	3079
June	1st to 10th	Night	9% 5% 2 5% 4 4 3 4 6% 10% 48%	1710
	11th to 20th	Night	6% 4 2 5% 4 3 3 4 7% 11% 50%	1561
	21st to end	Night	6% 4 2 5% 4 5% 6% 4 7% 11% 47%	1520
July	1st to 10th	Night	8% 5% 2 6% 5% 5% 5% 4 6% 9% 46%	2530
	11th to 20th	Night	7% 4 2 5% 3 4 4 3 7% 10% 51%	2729
	21st to end	Night	13% 8% 4 9% 6% 5% 6% 5% 7% 8% 30%	3087
August	1st to 10th	Night	7% 5% 2 5% 3 4 4 3 6% 9% 52%	2825
	11th to 20th	Night	8% 5% 2 6% 4 5% 6% 4 6% 9% 45%	2927
	21st to end	Night	3 3 1 3 3 2 3 3 5% 9% 63%	3476
September	1st to 10th	Night	12% 4 2 5% 4 4 4 3 4 7% 50%	1976
	11th to 20th	Night	11% 5% 2 5% 4 4 3 4 5% 7% 51%	2090
	21st to end	Night	12% 5% 2 5% 3 4 3 2 5% 6% 52%	2090
October	1st to 10th	Night	9% 4 1 5% 3 3 3 3 4 6% 59%	2090
	11th to 20th	Night	15% 5% 3 4 4 3 4 3 4 6% 49%	2197
	21st to end	Night	17% 7% 2 5% 4 3 4 3 4 6% 46%	2669
November	1st to 10th	Night	12% 6% 2 5% 4 3 4 3 5% 5% 51%	2452
	11th to 20th	Night	14% 9% 3 5% 4 3 3 3 4 6% 45%	2470
	21st to end	Night	18% 9% 3 5% 4 3 4 3 4 6% 40%	2470
December	1st to 10th	Night	22% 11% 5% 7% 4 4 4 3 5% 6% 32%	2470
	11th to 20th	Night	19% 12% 4 8% 4 4 3 3 5% 5% 34%	3042
	21st to end	Night	19% 16% 4 9% 7% 6% 5% 3 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	56% 4 7% 17% 11% 4	3120
	11th to 20th	Day	39% 5% 11% 25% 18% 1	3464
	21st to end	Day	44% 6% 12% 26% 12% 1	3828
April	1st to 10th	Day	42% 6% 11% 23% 15% 2	2280
	11th to 20th	Day	45% 5% 9% 21% 17% 3	2254
	21st to end	Day	46% 6% 9% 24% 12% 2	2460
May	1st to 10th	Day	51% 8% 12% 20% 9%	4120
	11th to 20th	Day	47% 6% 11% 22% 13% 1	4085
	21st to end	Day	41% 8% 13% 18% 19% 2	4489
June	1st to 10th	Day	40% 7% 9% 25% 16% 2	2470
	11th to 20th	Day	35% 8% 13% 24% 17% 2	2612
	21st to end	Day	36% 7% 14% 21% 18% 4	2660
July	1st to 10th	Day	42% 6% 13% 22% 16% 1	4371
	11th to 20th	Day	34% 7% 11% 33% 13% 2	4156
	21st to end	Day	56% 6% 11% 16% 9% 1	4324
August	1st to 10th	Day	31% 5% 13% 37% 13% 1	4091
	11th to 20th	Day	39% 5% 11% 27% 15% 2	3937
	21st to end	Day	27% 6% 11% 36% 17% 3	4179
September	1st to 10th	Day	39% 6% 11% 20% 18% 5%	2185
	11th to 20th	Day	35% 6% 10% 23% 23% 3	2090
	21st to end	Day	39% 4 8% 23% 23% 3	2090
October	1st to 10th	Day	21% 3 5% 27% 41% 3	3480
	11th to 20th	Day	26% 3 9% 27% 32% 3	3273
	21st to end	Day	31% 3 7% 29% 21% 8%	3151
November	1st to 10th	Day	33% 3 7% 28% 24% 4	1699
	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	56% 4 7% 19% 13% 2	3733
	11th to 20th	Night	38% 5% 10% 27% 16% 4	3494
	21st to end	Night	44% 6% 11% 24% 15% 1	3817
April	1st to 10th	Night	39% 8% 11% 22% 18% 3	1914
	11th to 20th	Night	44% 4 8% 19% 19% 6%	1875
	21st to end	Night	46% 6% 10% 22% 13% 3	1718
May	1st to 10th	Night	53% 9% 10% 19% 7% 2	2840
	11th to 20th	Night	41% 9% 13% 26% 11% 1	2813
	21st to end	Night	33% 11% 15% 23% 16% 3	3087
June	1st to 10th	Night	31% 6% 14% 26% 18% 5%	1710
	11th to 20th	Night	28% 7% 15% 25% 21% 5%	1561
	21st to end	Night	30% 8% 17% 22% 17% 6%	1520
July	1st to 10th	Night	35% 7% 12% 26% 18% 3	2490
	11th to 20th	Night	28% 5% 13% 35% 16% 2	2679
	21st to end	Night	51% 7% 12% 18% 10% 1	2988
August	1st to 10th	Night	29% 5% 14% 35% 15% 1	2814
	11th to 20th	Night	36% 6% 11% 30% 16% 1	2954
	21st to end	Night	19% 5% 14% 36% 22% 4	3476
September	1st to 10th	Night	33% 7% 11% 22% 21% 6%	1976
	11th to 20th	Night	32% 6% 11% 23% 25% 3	2090
	21st to end	Night	34% 6% 7% 25% 24% 5%	2090
October	1st to 10th	Night	21% 3 7% 21% 46% 3	3480
	11th to 20th	Night	26% 3 7% 25% 35% 6%	3644
	21st to end	Night	31% 2 8% 21% 30% 8%	4395
November	1st to 10th	Night	35% 4 9% 24% 24% 5%	2452
	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	21% 16% 26% 25% 11% 1	460
	11th to 20th	Day	22% 12% 26% 24% 12% 4	452
	21st to end	Day	21% 11% 31% 24% 9% 4	460
May	1st to 10th	Day	20% 14% 27% 22% 13% 5%	463
	11th to 20th	Day	20% 6% 24% 25% 17% 8%	487
	21st to end	Day	13% 5% 20% 29% 20% 13%	529
June	1st to 10th	Day	13% 4 17% 26% 27% 13%	490
	11th to 20th	Day	8% 3 19% 33% 25% 12%	632
	21st to end	Day	11% 4 22% 29% 22% 12%	680
July	1st to 10th	Day	13% 4 15% 23% 24% 21%	671
	11th to 20th	Day	10% 3 17% 27% 28% 15%	550
	21st to end	Day	13% 2 13% 28% 30% 15%	532
August	1st to 10th	Day	11% 3 13% 26% 28% 18%	486
	11th to 20th	Day	13% 3 14% 29% 29% 12%	479
	21st to end	Day	10% 1 9% 28% 29% 22%	539
September	1st to 10th	Day	13% 3 14% 27% 29% 14%	490
	11th to 20th	Day	12% 2 14% 25% 32% 16%	490
	21st to end	Day	18% 6% 17% 25% 23% 10%	490
October	1st to 10th	Day	12% 3 18% 33% 26% 8%	490
	11th to 20th	Day	15% 13% 27% 28% 14% 4	490
	21st to end	Day	20% 11% 34% 22% 13%	376
November	1st to 10th	Day	17% 6% 30% 29% 13% 5%	279
	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% 10% 29% 30% 8%	836
April	1st to 10th	Night	16% 11% 33% 32% 8%	584
	11th to 20th	Night	19% 9% 29% 30% 12% 1	563
	21st to end	Night	19% 8% 33% 28% 11% 2	570
May	1st to 10th	Night	21% 6% 26% 30% 15% 2	570
	11th to 20th	Night	16% 4 20% 35% 20% 4	561
	21st to end	Night	8% 3 18% 36% 29% 6%	617
June	1st to 10th	Night	10% 2 17% 40% 28% 3	570
	11th to 20th	Night	7% 2 15% 42% 29% 4	570
	21st to end	Night	6% 3 16% 43% 29% 3	570
July	1st to 10th	Night	11% 1 11% 29% 38% 10%	555
	11th to 20th	Night	6% 3 11% 34% 40% 6%	552
	21st to end	Night	11% 3 9% 35% 37% 6%	624
August	1st to 10th	Night	9% 1 9% 33% 42% 6%	567
	11th to 20th	Night	8% 1 10% 40% 34% 7%	564
	21st to end	Night	6% 7% 33% 48% 5%	627
September	1st to 10th	Night	13% 1 11% 33% 37% 5%	646
	11th to 20th	Night	12% 3 13% 30% 36% 6%	760
	21st to end	Night	13% 4 19% 32% 29% 3	760
October	1st to 10th	Night	11% 4 18% 33% 29% 6%	760
	11th to 20th	Night	19% 5% 24% 33% 17% 1	760
	21st to end	Night	19% 6% 30% 31% 13% 1	836
November	1st to 10th	Night	15% 8% 25% 34% 16% 2	755
	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 2024-11-01 22:47:44. Version ac07

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