Paradise
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Paradise clear sky chart from 2005-11-06 to 2026-04-17.

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	11% 4 1 3 2 2 2 2 3 5% 65%	140488
	Night	14% 4 1 3 2 2 3 2 4 5% 59%	139107
Transparency	Day	24% 4 6% 18% 24% 24%	135391
	Night	29% 4 6% 16% 22% 22%	135192
Seeing	Day	13% 10% 25% 32% 16% 4	16914
	Night	15% 5% 19% 34% 24% 4	26268

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	30% 6% 2 4 3 2 3 3 4 6% 38%	4722
	11th to 20th	Day	15% 5% 2 4 3 2 2 2 3 4 59%	5174
	21st to end	Day	18% 6% 2 5% 3 3 3 3 5% 7% 45%	5843
February	1st to 10th	Day	22% 5% 2 4 3 3 4 4 4 4 46%	1890
	11th to 20th	Day	20% 8% 2 5% 3 3 3 3 4 6% 44%	1926
	21st to end	Day	21% 7% 1 4 3 3 3 3 5% 6% 45%	1730
March	1st to 10th	Day	24% 12% 3 6% 4 3 3 3 3 4 35%	4831
	11th to 20th	Day	23% 7% 2 4 3 3 2 2 3 5% 46%	5110
	21st to end	Day	22% 9% 2 5% 4 4 3 4 5% 7% 34%	5779
April	1st to 10th	Day	17% 5% 2 5% 3 3 3 3 4 7% 45%	2520
	11th to 20th	Day	16% 5% 2 3 2 2 3 3 4 6% 53%	2442
	21st to end	Day	8% 4 1 4 3 2 3 3 5% 7% 58%	2400
May	1st to 10th	Day	6% 3 1 2 2 2 2 1 3 6% 72%	5741
	11th to 20th	Day	4 2 1 2 2 2 2 2 4 5% 74%	6277
	21st to end	Day	3 2 1 2 1 2 2 2 3 5% 77%	6902
June	1st to 10th	Day	6% 3 1 3 3 2 4 3 5% 8% 62%	2800
	11th to 20th	Day	2 1 2 2 2 2 2 4 5% 78%	2800
	21st to end	Day	2 1 1 1 1 1 2 2 3 84%	2800
July	1st to 10th	Day	1 1 1 1 1 1 2 92%	6319
	11th to 20th	Day	1 1 1 1 1 1 1 1 2 90%	6320
	21st to end	Day	1 1 2 1 1 2 2 3 4 84%	6451
August	1st to 10th	Day	1 1 1 2 1 1 2 2 3 4 82%	5777
	11th to 20th	Day	1 1 1 1 1 2 2 91%	5561
	21st to end	Day	2 1 1 2 1 1 1 1 2 4 85%	5984
September	1st to 10th	Day	1 1 1 1 1 1 2 2 4 86%	2400
	11th to 20th	Day	4 2 1 3 2 2 2 2 3 5% 75%	2400
	21st to end	Day	5% 1 1 2 1 1 2 2 2 5% 78%	2137
October	1st to 10th	Day	4 2 1 2 2 2 2 2 3 4 76%	3280
	11th to 20th	Day	7% 2 1 3 2 2 2 3 4 6% 68%	3261
	21st to end	Day	8% 3 1 5% 3 3 4 4 5% 7% 56%	3558
November	1st to 10th	Day	15% 4 1 4 3 3 3 2 5% 7% 52%	1900
	11th to 20th	Day	18% 4 1 4 4 3 4 4 5% 7% 46%	1873
	21st to end	Day	15% 5% 2 5% 3 3 3 3 4 5% 54%	1680
December	1st to 10th	Day	12% 3 1 4 2 3 3 3 5% 5% 59%	2700
	11th to 20th	Day	33% 6% 2 4 3 3 4 3 5% 7% 30%	3108
	21st to end	Day	34% 6% 2 5% 3 3 4 3 4 6% 30%	4092
January	1st to 10th	Night	27% 7% 2 5% 3 3 4 3 5% 6% 37%	8172
	11th to 20th	Night	15% 4 1 3 2 2 2 2 4 5% 60%	7804
	21st to end	Night	19% 7% 2 6% 4 3 3 3 4 5% 44%	8371
February	1st to 10th	Night	21% 5% 2 4 3 2 3 3 4 5% 48%	2730
	11th to 20th	Night	20% 7% 2 5% 3 3 3 3 5% 6% 45%	2579
	21st to end	Night	20% 6% 2 4 3 4 4 2 4 5% 46%	2076
March	1st to 10th	Night	23% 12% 2 6% 4 3 3 2 3 5% 37%	5280
	11th to 20th	Night	25% 8% 1 3 2 2 2 2 3 4 47%	5110
	21st to end	Night	24% 11% 3 5% 4 4 3 3 5% 6% 34%	5437
April	1st to 10th	Night	14% 6% 2 5% 4 3 4 4 5% 7% 46%	2100
	11th to 20th	Night	12% 5% 2 4 3 2 3 3 5% 7% 54%	2039
	21st to end	Night	9% 4 1 3 3 2 3 3 4 6% 62%	2000
May	1st to 10th	Night	5% 4 1 4 2 2 2 2 3 5% 69%	4226
	11th to 20th	Night	4 4 1 3 2 2 2 2 4 5% 70%	3616
	21st to end	Night	3 2 1 2 1 2 2 1 3 4 79%	3972
June	1st to 10th	Night	6% 3 2 3 3 2 3 4 5% 7% 62%	1600
	11th to 20th	Night	2 1 1 2 2 3 2 2 3 5% 78%	1600
	21st to end	Night	3 1 2 2 1 2 2 3 3 81%	1600
July	1st to 10th	Night	1 1 1 1 3 91%	3640
	11th to 20th	Night	1 1 2 1 1 1 1 2 1 89%	3640
	21st to end	Night	1 2 1 2 2 2 4 5% 81%	4416
August	1st to 10th	Night	2 2 1 2 1 1 2 2 2 3 81%	4035
	11th to 20th	Night	1 1 1 1 1 1 2 2 90%	4296
	21st to end	Night	3 1 1 2 1 2 1 1 2 3 82%	5015
September	1st to 10th	Night	2 1 1 1 1 2 1 2 3 86%	2000
	11th to 20th	Night	4 2 1 2 2 2 2 2 3 4 75%	2000
	21st to end	Night	3 1 1 2 1 1 2 2 3 5% 79%	2258
October	1st to 10th	Night	4 2 1 3 2 2 2 2 2 3 79%	3920
	11th to 20th	Night	5% 2 1 2 2 2 2 2 3 4 74%	3897
	21st to end	Night	10% 2 1 3 2 3 3 3 5% 6% 61%	4253
November	1st to 10th	Night	16% 4 1 3 3 3 4 3 6% 7% 52%	2618
	11th to 20th	Night	15% 5% 1 4 3 3 3 3 5% 8% 49%	2745
	21st to end	Night	16% 4 1 4 3 3 3 3 4 6% 55%	2940
December	1st to 10th	Night	13% 3 1 2 2 2 2 3 5% 7% 61%	4700
	11th to 20th	Night	34% 6% 2 4 4 4 4 3 5% 7% 27%	5316
	21st to end	Night	34% 7% 2 5% 4 3 3 2 4 5% 31%	7106

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	49% 5% 9% 19% 14% 4	4723
	11th to 20th	Day	32% 2 4 12% 21% 28%	5174
	21st to end	Day	39% 4 8% 16% 18% 15%	5843
February	1st to 10th	Day	41% 5% 8% 17% 18% 11%	1890
	11th to 20th	Day	43% 4 8% 18% 21% 6%	1935
	21st to end	Day	39% 5% 10% 22% 16% 8%	1730
March	1st to 10th	Day	51% 6% 5% 18% 15% 5%	4831
	11th to 20th	Day	41% 4 9% 26% 11% 8%	5110
	21st to end	Day	46% 8% 11% 22% 10% 2	5779
April	1st to 10th	Day	38% 5% 11% 24% 18% 4	2520
	11th to 20th	Day	32% 6% 12% 22% 19% 9%	2445
	21st to end	Day	25% 5% 14% 28% 23% 5%	2400
May	1st to 10th	Day	15% 3 9% 21% 33% 19%	5741
	11th to 20th	Day	13% 3 7% 25% 40% 12%	6280
	21st to end	Day	11% 3 8% 29% 40% 8%	6904
June	1st to 10th	Day	20% 6% 9% 26% 26% 13%	2800
	11th to 20th	Day	9% 4 8% 19% 36% 24%	2800
	21st to end	Day	8% 1 3 14% 35% 38%	2800
July	1st to 10th	Day	3 1 1 8% 21% 65%	6251
	11th to 20th	Day	5% 1 2 5% 14% 74%	6245
	21st to end	Day	6% 2 4 15% 27% 44%	6264
August	1st to 10th	Day	11% 2 2 8% 24% 51%	4206
	11th to 20th	Day	4 1 2 8% 42% 42%	4020
	21st to end	Day	6% 2 2 11% 40% 39%	4311
September	1st to 10th	Day	6% 1 2 9% 27% 54%	2400
	11th to 20th	Day	13% 3 5% 21% 34% 23%	2400
	21st to end	Day	12% 2 5% 18% 30% 33%	2137
October	1st to 10th	Day	14% 3 3 12% 25% 43%	3280
	11th to 20th	Day	18% 4 4 21% 34% 18%	3261
	21st to end	Day	25% 6% 6% 19% 28% 16%	3558
November	1st to 10th	Day	32% 6% 7% 21% 20% 14%	1900
	11th to 20th	Day	37% 5% 11% 21% 17% 9%	1873
	21st to end	Day	34% 4 7% 18% 23% 15%	1680
December	1st to 10th	Day	27% 4 6% 19% 28% 16%	2700
	11th to 20th	Day	54% 4 8% 16% 13% 5%	3108
	21st to end	Day	56% 5% 10% 15% 10% 3	4092
January	1st to 10th	Night	48% 6% 10% 18% 14% 4	8172
	11th to 20th	Night	29% 4 6% 10% 22% 30%	7804
	21st to end	Night	43% 3 6% 12% 15% 20%	8371
February	1st to 10th	Night	38% 4 7% 19% 19% 13%	2730
	11th to 20th	Night	41% 5% 7% 18% 21% 8%	2581
	21st to end	Night	40% 5% 8% 21% 18% 8%	2076
March	1st to 10th	Night	50% 5% 7% 17% 14% 7%	5280
	11th to 20th	Night	43% 4 6% 20% 21% 7%	5110
	21st to end	Night	50% 7% 9% 20% 11% 2	5437
April	1st to 10th	Night	36% 7% 11% 21% 19% 7%	2100
	11th to 20th	Night	30% 6% 12% 22% 21% 10%	2039
	21st to end	Night	24% 5% 12% 28% 25% 6%	2000
May	1st to 10th	Night	17% 6% 8% 19% 31% 18%	4223
	11th to 20th	Night	17% 4 6% 21% 34% 18%	3616
	21st to end	Night	11% 4 8% 30% 37% 11%	3972
June	1st to 10th	Night	20% 7% 10% 28% 24% 10%	1600
	11th to 20th	Night	11% 4 8% 18% 32% 28%	1600
	21st to end	Night	11% 2 4 14% 31% 38%	1600
July	1st to 10th	Night	3 1 2 8% 21% 65%	3600
	11th to 20th	Night	6% 1 2 5% 13% 73%	3592
	21st to end	Night	7% 2 4 18% 26% 43%	4291
August	1st to 10th	Night	15% 2 2 8% 23% 50%	2929
	11th to 20th	Night	4 1 2 8% 37% 47%	3108
	21st to end	Night	8% 1 2 11% 35% 42%	3608
September	1st to 10th	Night	7% 2 2 8% 27% 55%	2000
	11th to 20th	Night	14% 3 4 18% 35% 25%	2000
	21st to end	Night	11% 2 5% 15% 32% 35%	2258
October	1st to 10th	Night	14% 2 3 11% 21% 49%	3920
	11th to 20th	Night	15% 3 5% 25% 30% 21%	3897
	21st to end	Night	23% 4 6% 19% 29% 19%	4253
November	1st to 10th	Night	32% 5% 8% 22% 17% 16%	2618
	11th to 20th	Night	33% 6% 11% 21% 19% 10%	2745
	21st to end	Night	32% 4 6% 21% 23% 14%	2940
December	1st to 10th	Night	24% 3 6% 18% 25% 23%	4700
	11th to 20th	Night	56% 5% 6% 12% 17% 5%	5316
	21st to end	Night	56% 5% 9% 14% 12% 4	7106

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	44% 5% 22% 19% 10% 1	220
	11th to 20th	Day	25% 9% 25% 26% 12% 3	368
	21st to end	Day	22% 8% 22% 29% 15% 3	473
February	1st to 10th	Day	26% 13% 21% 26% 13% 2	430
	11th to 20th	Day	26% 14% 27% 22% 10% 1	468
	21st to end	Day	22% 13% 31% 25% 9%	446
March	1st to 10th	Day	30% 20% 25% 19% 5% 1	540
	11th to 20th	Day	29% 12% 27% 18% 12% 1	540
	21st to end	Day	24% 17% 30% 22% 7% 1	594
April	1st to 10th	Day	23% 13% 29% 24% 9% 2	540
	11th to 20th	Day	20% 17% 28% 24% 10% 1	517
	21st to end	Day	9% 15% 29% 28% 14% 4	500
May	1st to 10th	Day	10% 16% 33% 26% 13% 3	503
	11th to 20th	Day	11% 13% 25% 29% 16% 6%	528
	21st to end	Day	8% 9% 28% 30% 20% 6%	573
June	1st to 10th	Day	6% 12% 24% 33% 19% 6%	530
	11th to 20th	Day	5% 12% 32% 33% 15% 4	530
	21st to end	Day	2 5% 29% 39% 16% 8%	530
July	1st to 10th	Day	2 4 26% 45% 17% 7%	526
	11th to 20th	Day	1 2 23% 44% 25% 6%	524
	21st to end	Day	1 2 22% 46% 21% 9%	575
August	1st to 10th	Day	2 3 23% 41% 24% 7%	527
	11th to 20th	Day	1 3 24% 39% 24% 8%	517
	21st to end	Day	3 3 19% 45% 25% 5%	583
September	1st to 10th	Day	2 5% 25% 45% 19% 4	530
	11th to 20th	Day	5% 9% 23% 38% 23% 3	530
	21st to end	Day	4 10% 27% 38% 19% 3	530
October	1st to 10th	Day	8% 8% 27% 36% 19% 2	530
	11th to 20th	Day	9% 9% 22% 34% 22% 5%	530
	21st to end	Day	14% 8% 23% 31% 19% 4	583
November	1st to 10th	Day	19% 9% 20% 27% 19% 5%	376
	11th to 20th	Day	19% 6% 26% 23% 17% 8%	321
	21st to end	Day	15% 11% 20% 32% 15% 7%	220
December	1st to 10th	Day	25% 4 23% 25% 16% 6%	220
	11th to 20th	Day	29% 6% 22% 24% 13% 6%	220
	21st to end	Day	29% 12% 21% 23% 12% 3	242
January	1st to 10th	Night	26% 6% 23% 31% 13% 2	840
	11th to 20th	Night	22% 5% 23% 37% 11% 1	840
	21st to end	Night	21% 6% 24% 31% 16% 2	924
February	1st to 10th	Night	23% 6% 24% 31% 15% 1	840
	11th to 20th	Night	23% 9% 20% 30% 16% 2	824
	21st to end	Night	23% 7% 25% 34% 10% 2	692
March	1st to 10th	Night	28% 9% 20% 26% 14% 3	840
	11th to 20th	Night	25% 7% 20% 28% 18% 3	840
	21st to end	Night	25% 7% 25% 28% 14% 1	924
April	1st to 10th	Night	18% 8% 24% 32% 16% 2	840
	11th to 20th	Night	15% 8% 21% 34% 18% 4	815
	21st to end	Night	11% 7% 21% 36% 22% 4	800
May	1st to 10th	Night	9% 8% 28% 29% 23% 3	661
	11th to 20th	Night	9% 4 23% 36% 25% 4	394
	21st to end	Night	7% 6% 20% 30% 31% 4	433
June	1st to 10th	Night	7% 4 16% 37% 33% 4	400
	11th to 20th	Night	2 5% 22% 36% 32% 4	400
	21st to end	Night	4 3 14% 39% 35% 5%	400
July	1st to 10th	Night	1 1 13% 36% 46% 4	390
	11th to 20th	Night	1 2 11% 43% 40% 5%	388
	21st to end	Night	1 9% 31% 51% 8%	627
August	1st to 10th	Night	3 1 9% 35% 46% 7%	597
	11th to 20th	Night	1 1 11% 38% 41% 7%	695
	21st to end	Night	1 1 9% 38% 44% 6%	880
September	1st to 10th	Night	2 2 14% 39% 38% 5%	800
	11th to 20th	Night	4 3 13% 35% 36% 9%	800
	21st to end	Night	4 3 19% 37% 29% 8%	800
October	1st to 10th	Night	7% 6% 18% 40% 24% 5%	800
	11th to 20th	Night	8% 5% 17% 38% 28% 5%	800
	21st to end	Night	12% 4 21% 31% 27% 6%	880
November	1st to 10th	Night	17% 6% 18% 30% 25% 4	820
	11th to 20th	Night	17% 5% 24% 33% 17% 3	840
	21st to end	Night	17% 5% 23% 36% 17% 3	840
December	1st to 10th	Night	22% 5% 19% 36% 15% 2	840
	11th to 20th	Night	30% 5% 18% 31% 14% 1	840
	21st to end	Night	30% 4 25% 29% 11% 1	924

Page generated at 2026-04-13 23:44:27. Version ac07

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