Reynold's Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Reynold's Creek clear sky chart from 2005-11-06 to 2026-04-02.

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 4 2 5% 4 4 4 4 6% 8% 57%	139858
	Night	4 5% 2 5% 4 4 5% 4 6% 8% 53%	139293
Transparency	Day	25% 6% 12% 22% 21% 14%	134654
	Night	28% 7% 14% 22% 19% 11%	135493
Seeing	Day	6% 11% 28% 31% 19% 6%	16227
	Night	7% 7% 24% 37% 22% 4	25658

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	3 9% 4 10% 7% 6% 7% 6% 9% 10% 31%	4722
	11th to 20th	Day	3 6% 3 6% 4 4 4 5% 8% 11% 45%	4740
	21st to end	Day	3 6% 3 8% 6% 6% 7% 5% 7% 7% 43%	5187
February	1st to 10th	Day	3 6% 3 8% 7% 7% 6% 6% 6% 9% 40%	1878
	11th to 20th	Day	4 9% 4 7% 6% 6% 4 5% 7% 9% 40%	2050
	21st to end	Day	3 7% 3 8% 6% 5% 6% 5% 8% 8% 40%	1730
March	1st to 10th	Day	3 8% 4 9% 6% 5% 5% 4 6% 8% 41%	4618
	11th to 20th	Day	2 6% 2 7% 4 5% 5% 4 6% 7% 52%	4874
	21st to end	Day	4 8% 3 8% 6% 6% 7% 5% 9% 10% 34%	5936
April	1st to 10th	Day	6% 7% 2 7% 7% 5% 5% 5% 6% 8% 40%	2413
	11th to 20th	Day	3 7% 3 6% 5% 4 5% 4 6% 8% 48%	2384
	21st to end	Day	5% 6% 2 6% 4 5% 5% 4 7% 8% 48%	2600
May	1st to 10th	Day	3 4 2 4 3 4 4 3 5% 7% 61%	5880
	11th to 20th	Day	4 4 1 4 3 3 4 3 5% 8% 60%	6057
	21st to end	Day	3 3 1 4 3 4 4 4 6% 8% 61%	6902
June	1st to 10th	Day	6% 6% 1 5% 5% 5% 5% 4 7% 9% 47%	2800
	11th to 20th	Day	4 3 1 4 4 3 3 4 6% 8% 59%	2800
	21st to end	Day	2 1 1 2 2 2 3 4 4 7% 72%	2800
July	1st to 10th	Day	1 1 1 1 1 2 3 3 4 5% 79%	6319
	11th to 20th	Day	1 1 1 1 2 2 1 2 3 4 83%	6320
	21st to end	Day	1 1 1 2 2 3 4 3 7% 8% 68%	6880
August	1st to 10th	Day	1 2 1 3 2 3 4 3 6% 8% 67%	6004
	11th to 20th	Day	1 1 2 1 2 2 2 3 5% 81%	5716
	21st to end	Day	3 2 1 3 2 3 3 3 5% 5% 69%	5984
September	1st to 10th	Day	1 2 1 2 2 3 2 2 5% 6% 74%	2400
	11th to 20th	Day	3 2 1 4 3 3 3 3 5% 7% 66%	2235
	21st to end	Day	3 3 1 4 3 3 4 2 4 6% 68%	2200
October	1st to 10th	Day	3 3 1 3 2 3 3 3 4 4 71%	3600
	11th to 20th	Day	4 4 1 4 4 4 4 4 5% 7% 59%	3142
	21st to end	Day	3 4 2 5% 4 5% 5% 5% 6% 8% 55%	3200
November	1st to 10th	Day	5% 7% 2 7% 5% 5% 5% 4 6% 8% 45%	1854
	11th to 20th	Day	5% 6% 2 7% 5% 6% 6% 5% 7% 10% 41%	1890
	21st to end	Day	3 5% 3 6% 5% 5% 6% 5% 7% 10% 44%	1843
December	1st to 10th	Day	3 4 2 4 4 4 5% 5% 6% 11% 52%	2700
	11th to 20th	Day	6% 8% 3 9% 7% 7% 7% 6% 7% 9% 31%	3108
	21st to end	Day	4 7% 3 9% 6% 7% 8% 6% 8% 10% 32%	4092
January	1st to 10th	Night	4 10% 5% 11% 7% 7% 7% 6% 8% 8% 28%	8172
	11th to 20th	Night	3 6% 2 6% 4 4 5% 4 7% 7% 51%	8220
	21st to end	Night	4 6% 2 6% 4 5% 5% 5% 7% 8% 47%	8994
February	1st to 10th	Night	4 6% 3 8% 7% 6% 5% 5% 7% 9% 38%	2736
	11th to 20th	Night	4 8% 2 6% 6% 6% 6% 5% 7% 10% 40%	2458
	21st to end	Night	4 7% 2 6% 6% 5% 6% 6% 8% 8% 41%	2076
March	1st to 10th	Night	4 8% 3 7% 4 4 5% 4 7% 9% 46%	5496
	11th to 20th	Night	4 8% 3 6% 5% 4 4 4 5% 7% 51%	5346
	21st to end	Night	3 7% 3 7% 5% 6% 7% 5% 7% 9% 40%	5266
April	1st to 10th	Night	5% 7% 2 6% 6% 5% 6% 4 6% 8% 45%	2010
	11th to 20th	Night	4 4 2 6% 4 5% 6% 4 7% 7% 52%	1964
	21st to end	Night	5% 5% 2 6% 4 3 4 4 6% 7% 54%	1800
May	1st to 10th	Night	5% 4 1 4 3 3 3 3 5% 7% 61%	4100
	11th to 20th	Night	3 4 1 3 3 3 5% 4 6% 8% 60%	3829
	21st to end	Night	3 3 1 3 3 4 3 3 5% 6% 66%	3972
June	1st to 10th	Night	6% 4 2 6% 4 5% 4 5% 6% 9% 49%	1600
	11th to 20th	Night	3 4 1 4 4 3 5% 3 4 7% 62%	1600
	21st to end	Night	1 1 1 3 2 3 3 3 6% 7% 69%	1600
July	1st to 10th	Night	1 1 2 2 2 3 2 4 4 79%	3640
	11th to 20th	Night	1 2 2 2 2 3 5% 83%	3640
	21st to end	Night	1 1 1 3 3 4 5% 5% 6% 9% 63%	3970
August	1st to 10th	Night	2 2 1 3 3 4 4 4 6% 8% 66%	3796
	11th to 20th	Night	1 1 1 1 2 2 3 3 3 5% 80%	4133
	21st to end	Night	4 2 1 3 2 3 3 3 4 5% 70%	5015
September	1st to 10th	Night	3 1 1 2 2 2 3 2 4 6% 73%	2000
	11th to 20th	Night	2 2 1 3 3 2 3 4 6% 7% 66%	2165
	21st to end	Night	4 2 2 4 3 2 3 3 4 5% 69%	2200
October	1st to 10th	Night	3 2 1 3 2 2 3 3 5% 5% 71%	3600
	11th to 20th	Night	2 3 1 4 3 3 4 3 6% 8% 64%	4005
	21st to end	Night	5% 4 2 5% 4 5% 5% 4 6% 9% 52%	4600
November	1st to 10th	Night	6% 6% 2 6% 5% 4 6% 4 7% 8% 46%	2665
	11th to 20th	Night	7% 6% 2 6% 5% 4 6% 5% 7% 9% 42%	2730
	21st to end	Night	4 7% 2 6% 5% 6% 5% 5% 7% 7% 46%	2773
December	1st to 10th	Night	3 5% 2 6% 4 4 4 4 5% 8% 55%	4700
	11th to 20th	Night	6% 8% 4 9% 6% 7% 7% 6% 8% 11% 29%	5316
	21st to end	Night	6% 10% 3 9% 5% 6% 6% 5% 7% 8% 34%	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	40% 16% 22% 18% 3	4723
	11th to 20th	Day	30% 13% 23% 27% 6%	4740
	21st to end	Day	36% 10% 18% 25% 10% 1	5187
February	1st to 10th	Day	38% 10% 23% 22% 6% 1	1878
	11th to 20th	Day	38% 10% 19% 24% 8% 1	2060
	21st to end	Day	37% 8% 19% 24% 10% 2	1730
March	1st to 10th	Day	39% 7% 10% 28% 14% 2	4618
	11th to 20th	Day	28% 6% 13% 35% 17% 1	4874
	21st to end	Day	38% 11% 19% 21% 10% 3	5936
April	1st to 10th	Day	39% 6% 16% 23% 13% 3	2413
	11th to 20th	Day	32% 7% 12% 24% 19% 5%	2387
	21st to end	Day	30% 5% 14% 30% 17% 3	2600
May	1st to 10th	Day	23% 4 8% 27% 33% 5%	5880
	11th to 20th	Day	22% 3 9% 24% 30% 12%	6060
	21st to end	Day	20% 5% 10% 29% 28% 8%	6904
June	1st to 10th	Day	32% 6% 13% 27% 20% 3	2800
	11th to 20th	Day	22% 4 10% 25% 28% 11%	2800
	21st to end	Day	12% 3 7% 22% 35% 22%	2800
July	1st to 10th	Day	8% 2 4 9% 23% 53%	6251
	11th to 20th	Day	8% 1 2 6% 20% 63%	6245
	21st to end	Day	12% 2 5% 15% 34% 31%	6681
August	1st to 10th	Day	17% 2 5% 11% 26% 38%	4373
	11th to 20th	Day	8% 2 4 13% 38% 37%	4139
	21st to end	Day	12% 2 5% 15% 36% 31%	4311
September	1st to 10th	Day	12% 3 5% 17% 31% 32%	2400
	11th to 20th	Day	18% 3 9% 25% 28% 17%	2235
	21st to end	Day	19% 3 7% 25% 32% 14%	2200
October	1st to 10th	Day	18% 3 8% 17% 39% 15%	3600
	11th to 20th	Day	25% 3 13% 31% 24% 4	3142
	21st to end	Day	25% 4 15% 32% 22% 2	3200
November	1st to 10th	Day	36% 6% 17% 27% 14% 1	1854
	11th to 20th	Day	34% 9% 24% 25% 7% 1	1890
	21st to end	Day	32% 9% 23% 28% 8%	1843
December	1st to 10th	Day	26% 13% 26% 31% 5%	2700
	11th to 20th	Day	44% 12% 26% 16% 2	3108
	21st to end	Day	40% 12% 24% 19% 4	4092
January	1st to 10th	Night	46% 14% 21% 15% 3	8172
	11th to 20th	Night	30% 8% 20% 29% 11%	8220
	21st to end	Night	32% 11% 18% 26% 12% 2	8994
February	1st to 10th	Night	40% 10% 20% 26% 5% 1	2736
	11th to 20th	Night	36% 10% 19% 23% 11% 1	2459
	21st to end	Night	35% 9% 18% 24% 12% 2	2076
March	1st to 10th	Night	33% 7% 11% 29% 18% 1	5496
	11th to 20th	Night	31% 5% 9% 29% 24% 1	5346
	21st to end	Night	33% 9% 19% 26% 11% 1	5266
April	1st to 10th	Night	36% 5% 14% 27% 16% 3	2010
	11th to 20th	Night	28% 5% 12% 30% 20% 4	1964
	21st to end	Night	26% 5% 14% 32% 21% 3	1800
May	1st to 10th	Night	22% 4 8% 24% 36% 8%	4097
	11th to 20th	Night	20% 5% 8% 24% 34% 8%	3829
	21st to end	Night	19% 4 10% 26% 32% 9%	3972
June	1st to 10th	Night	30% 5% 16% 26% 20% 3	1600
	11th to 20th	Night	22% 4 9% 22% 32% 11%	1600
	21st to end	Night	13% 2 9% 20% 32% 23%	1600
July	1st to 10th	Night	10% 1 3 10% 20% 56%	3600
	11th to 20th	Night	7% 1 3 5% 21% 63%	3592
	21st to end	Night	18% 2 5% 14% 31% 31%	3857
August	1st to 10th	Night	19% 2 4 12% 27% 38%	2755
	11th to 20th	Night	9% 1 4 11% 27% 48%	2984
	21st to end	Night	13% 2 3 12% 35% 35%	3608
September	1st to 10th	Night	13% 2 5% 14% 30% 36%	2000
	11th to 20th	Night	16% 3 9% 22% 25% 25%	2165
	21st to end	Night	18% 3 6% 20% 33% 21%	2200
October	1st to 10th	Night	16% 3 7% 18% 32% 25%	3600
	11th to 20th	Night	18% 2 10% 31% 32% 6%	4005
	21st to end	Night	27% 5% 13% 29% 23% 3	4600
November	1st to 10th	Night	34% 6% 15% 24% 18% 2	2665
	11th to 20th	Night	36% 7% 19% 28% 10%	2730
	21st to end	Night	33% 7% 21% 27% 11%	2773
December	1st to 10th	Night	27% 8% 25% 33% 6% 1	4700
	11th to 20th	Night	44% 14% 21% 19% 3	5316
	21st to end	Night	44% 11% 22% 16% 8%	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	10% 19% 28% 25% 14% 4	220
	11th to 20th	Day	6% 11% 30% 26% 22% 4	220
	21st to end	Day	7% 7% 28% 34% 20% 4	242
February	1st to 10th	Day	6% 17% 33% 21% 19% 3	375
	11th to 20th	Day	9% 19% 32% 26% 12% 3	535
	21st to end	Day	9% 20% 29% 28% 12% 2	446
March	1st to 10th	Day	8% 17% 38% 27% 9% 1	540
	11th to 20th	Day	6% 17% 29% 31% 14% 3	540
	21st to end	Day	9% 17% 34% 27% 12% 2	594
April	1st to 10th	Day	9% 22% 26% 22% 16% 5%	505
	11th to 20th	Day	7% 17% 35% 24% 12% 4	492
	21st to end	Day	8% 15% 36% 25% 14% 3	500
May	1st to 10th	Day	4 17% 31% 29% 14% 5%	503
	11th to 20th	Day	12% 11% 28% 27% 17% 5%	528
	21st to end	Day	8% 7% 22% 33% 21% 9%	573
June	1st to 10th	Day	6% 8% 28% 29% 21% 8%	530
	11th to 20th	Day	5% 11% 32% 34% 14% 4	530
	21st to end	Day	2 6% 31% 33% 20% 7%	530
July	1st to 10th	Day	1 2 30% 41% 19% 7%	526
	11th to 20th	Day	2 3 30% 42% 19% 4	524
	21st to end	Day	2 3 23% 39% 28% 5%	575
August	1st to 10th	Day	3 3 28% 35% 25% 6%	527
	11th to 20th	Day	1 2 25% 36% 26% 10%	517
	21st to end	Day	3 5% 21% 34% 24% 12%	583
September	1st to 10th	Day	4 4 17% 32% 30% 13%	530
	11th to 20th	Day	3 5% 22% 31% 28% 11%	530
	21st to end	Day	4 6% 22% 34% 24% 10%	530
October	1st to 10th	Day	6% 10% 22% 26% 25% 12%	530
	11th to 20th	Day	7% 7% 26% 26% 24% 9%	442
	21st to end	Day	7% 10% 28% 28% 21% 6%	363
November	1st to 10th	Day	7% 14% 26% 32% 17% 4	330
	11th to 20th	Day	7% 11% 28% 32% 16% 5%	330
	21st to end	Day	5% 11% 25% 34% 21% 4	305
December	1st to 10th	Day	8% 10% 28% 28% 15% 11%	220
	11th to 20th	Day	10% 14% 31% 28% 15% 3	220
	21st to end	Day	9% 18% 29% 30% 12% 2	242
January	1st to 10th	Night	8% 9% 31% 29% 19% 3	840
	11th to 20th	Night	8% 8% 27% 31% 22% 4	840
	21st to end	Night	9% 5% 23% 35% 25% 4	924
February	1st to 10th	Night	8% 10% 31% 33% 17% 1	840
	11th to 20th	Night	7% 7% 31% 36% 17% 2	824
	21st to end	Night	7% 11% 33% 33% 15% 1	692
March	1st to 10th	Night	7% 12% 30% 35% 13% 2	840
	11th to 20th	Night	8% 10% 26% 37% 16% 3	840
	21st to end	Night	8% 13% 30% 33% 14% 1	924
April	1st to 10th	Night	9% 9% 25% 35% 19% 2	804
	11th to 20th	Night	6% 10% 30% 36% 16% 3	776
	21st to end	Night	7% 9% 29% 37% 15% 3	600
May	1st to 10th	Night	6% 9% 31% 35% 17% 2	600
	11th to 20th	Night	6% 9% 25% 33% 21% 6%	490
	21st to end	Night	7% 5% 24% 33% 26% 5%	433
June	1st to 10th	Night	7% 7% 22% 37% 23% 5%	400
	11th to 20th	Night	5% 8% 28% 37% 20% 2	400
	21st to end	Night	1 3 27% 40% 27% 3	400
July	1st to 10th	Night	1 2 18% 49% 28% 2	390
	11th to 20th	Night	1 2 18% 55% 24% 1	388
	21st to end	Night	2 1 14% 51% 29% 3	438
August	1st to 10th	Night	4 2 15% 45% 32% 2	487
	11th to 20th	Night	1 1 13% 50% 32% 3	624
	21st to end	Night	3 3 15% 44% 30% 6%	880
September	1st to 10th	Night	4 1 13% 41% 36% 5%	800
	11th to 20th	Night	3 3 14% 39% 33% 8%	800
	21st to end	Night	5% 5% 17% 36% 28% 10%	800
October	1st to 10th	Night	8% 4 20% 36% 27% 6%	800
	11th to 20th	Night	5% 6% 20% 37% 26% 6%	800
	21st to end	Night	7% 6% 23% 38% 22% 6%	880
November	1st to 10th	Night	8% 7% 23% 35% 25% 3	820
	11th to 20th	Night	11% 8% 28% 32% 19% 3	840
	21st to end	Night	7% 7% 26% 34% 23% 3	840
December	1st to 10th	Night	7% 8% 28% 36% 18% 3	840
	11th to 20th	Night	11% 9% 24% 37% 17% 2	840
	21st to end	Night	12% 11% 32% 31% 11% 2	924

Page generated at 2026-03-30 00:18:41. Version ac07

Copyright © 2026 Attilla Danko.