Dogpound
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dogpound clear sky chart from 2005-11-06 to 2026-08-30.

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	8% 9% 3 8% 5% 5% 5% 4 7% 8% 37%	148793
	Night	6% 9% 4 9% 5% 5% 5% 4 6% 8% 37%	142140
Transparency	Day	42% 7% 15% 24% 11% 2	148496
	Night	42% 7% 15% 22% 11% 2	142020
Seeing	Day	14% 10% 29% 29% 14% 4	17742
	Night	11% 7% 33% 34% 13% 1	26657

By Month

Percentage Cloud Cover NW (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	1 7% 5% 12% 6% 8% 6% 4 7% 9% 33%	4125
	11th to 20th	Day	2 9% 4 10% 5% 5% 5% 5% 7% 7% 42%	4216
	21st to end	Day	3 6% 3 10% 5% 5% 5% 5% 7% 10% 42%	5186
February	1st to 10th	Day	3 10% 5% 12% 8% 6% 5% 5% 7% 8% 29%	1680
	11th to 20th	Day	3 12% 4 11% 8% 6% 5% 6% 7% 8% 32%	1803
	21st to end	Day	4 11% 5% 11% 6% 6% 5% 5% 7% 8% 32%	1695
March	1st to 10th	Day	2 9% 4 11% 5% 5% 5% 4 7% 11% 36%	4618
	11th to 20th	Day	4 10% 5% 9% 4 4 6% 4 7% 9% 38%	5014
	21st to end	Day	7% 22% 7% 12% 5% 5% 6% 4 6% 6% 21%	5738
April	1st to 10th	Day	8% 16% 5% 11% 6% 5% 6% 5% 6% 8% 24%	2567
	11th to 20th	Day	10% 18% 5% 10% 5% 4 4 4 6% 8% 27%	2700
	21st to end	Day	12% 13% 4 10% 5% 5% 5% 3 5% 8% 29%	2730
May	1st to 10th	Day	10% 12% 3 8% 5% 4 5% 4 6% 7% 36%	8118
	11th to 20th	Day	12% 11% 4 11% 6% 6% 7% 5% 7% 8% 23%	8755
	21st to end	Day	13% 9% 3 9% 6% 6% 6% 4 6% 7% 31%	9649
June	1st to 10th	Day	17% 8% 3 8% 6% 7% 6% 5% 7% 7% 27%	3150
	11th to 20th	Day	21% 10% 3 9% 6% 6% 6% 5% 6% 7% 22%	3150
	21st to end	Day	11% 6% 3 7% 6% 5% 7% 4 8% 9% 34%	3150
July	1st to 10th	Day	7% 5% 2 7% 5% 5% 6% 5% 8% 10% 42%	8820
	11th to 20th	Day	10% 4 2 5% 4 4 6% 5% 7% 9% 45%	8820
	21st to end	Day	8% 5% 2 6% 4 4 4 4 6% 9% 50%	9337
August	1st to 10th	Day	10% 6% 2 6% 5% 5% 5% 5% 7% 8% 41%	4681
	11th to 20th	Day	8% 5% 2 7% 4 5% 6% 5% 8% 10% 39%	4381
	21st to end	Day	10% 5% 2 5% 3 3 4 4 6% 8% 51%	4782
September	1st to 10th	Day	12% 7% 2 6% 4 4 4 3 5% 8% 46%	2480
	11th to 20th	Day	14% 8% 2 5% 4 4 5% 3 5% 6% 44%	2202
	21st to end	Day	9% 8% 3 6% 5% 4 5% 4 6% 7% 43%	2200
October	1st to 10th	Day	8% 7% 3 6% 4 4 5% 4 8% 10% 43%	3475
	11th to 20th	Day	6% 6% 3 7% 4 5% 6% 5% 8% 10% 39%	2967
	21st to end	Day	7% 9% 3 6% 5% 5% 5% 3 6% 7% 44%	3200
November	1st to 10th	Day	7% 14% 5% 8% 5% 5% 5% 5% 5% 7% 33%	1726
	11th to 20th	Day	4 12% 4 9% 6% 5% 4 5% 6% 7% 39%	1561
	21st to end	Day	4 14% 4 9% 6% 5% 4 3 7% 9% 34%	1470
December	1st to 10th	Day	3 11% 4 11% 6% 6% 7% 5% 7% 8% 30%	2360
	11th to 20th	Day	3 9% 4 13% 6% 6% 5% 5% 7% 9% 34%	2712
	21st to end	Day	2 11% 5% 9% 5% 5% 4 5% 6% 7% 42%	3575
January	1st to 10th	Night	2 11% 5% 13% 8% 6% 6% 5% 7% 8% 27%	8768
	11th to 20th	Night	2 9% 4 11% 6% 5% 5% 5% 6% 8% 39%	8738
	21st to end	Night	2 8% 4 12% 6% 5% 5% 4 6% 9% 38%	8994
February	1st to 10th	Night	5% 10% 4 11% 8% 7% 6% 4 6% 8% 31%	2940
	11th to 20th	Night	3 12% 5% 11% 6% 7% 6% 5% 8% 9% 29%	2703
	21st to end	Night	2 11% 4 12% 7% 5% 5% 5% 6% 8% 35%	2107
March	1st to 10th	Night	2 9% 4 12% 6% 6% 6% 4 8% 9% 34%	5496
	11th to 20th	Night	4 8% 4 10% 6% 5% 6% 5% 8% 9% 36%	5205
	21st to end	Night	7% 18% 6% 12% 6% 6% 6% 4 6% 7% 23%	5476
April	1st to 10th	Night	7% 15% 4 9% 6% 4 5% 5% 6% 7% 31%	2053
	11th to 20th	Night	9% 15% 5% 11% 6% 5% 5% 3 5% 7% 30%	1871
	21st to end	Night	9% 11% 4 9% 6% 6% 6% 5% 7% 7% 30%	1890
May	1st to 10th	Night	12% 12% 4 7% 4 4 4 3 5% 7% 38%	4793
	11th to 20th	Night	12% 10% 3 9% 5% 5% 5% 4 8% 10% 29%	4105
	21st to end	Night	10% 8% 3 8% 5% 6% 6% 5% 7% 8% 34%	4522
June	1st to 10th	Night	17% 9% 3 6% 5% 5% 4 4 6% 8% 32%	1470
	11th to 20th	Night	18% 9% 3 8% 7% 5% 6% 4 5% 7% 29%	1470
	21st to end	Night	10% 6% 2 6% 5% 5% 6% 5% 8% 9% 38%	1470
July	1st to 10th	Night	7% 5% 2 7% 5% 4 5% 4 7% 8% 47%	4140
	11th to 20th	Night	8% 4 1 5% 3 4 4 4 6% 9% 52%	4140
	21st to end	Night	9% 5% 2 5% 3 4 3 3 5% 9% 53%	4728
August	1st to 10th	Night	11% 7% 3 6% 3 4 5% 4 6% 9% 43%	2689
	11th to 20th	Night	8% 6% 2 6% 4 5% 5% 5% 7% 11% 42%	2893
	21st to end	Night	9% 5% 2 5% 3 4 4 3 5% 8% 51%	3326
September	1st to 10th	Night	11% 6% 2 5% 4 2 4 3 6% 8% 48%	1917
	11th to 20th	Night	14% 8% 2 5% 3 4 3 4 5% 7% 45%	2197
	21st to end	Night	10% 8% 2 5% 4 4 4 5% 6% 8% 45%	2200
October	1st to 10th	Night	8% 7% 3 5% 4 4 5% 4 6% 7% 48%	3720
	11th to 20th	Night	6% 8% 2 7% 4 5% 4 4 5% 8% 47%	4179
	21st to end	Night	5% 8% 3 8% 5% 5% 5% 5% 6% 8% 44%	4600
November	1st to 10th	Night	6% 14% 3 9% 5% 5% 5% 4 7% 7% 34%	2771
	11th to 20th	Night	3 11% 4 9% 6% 5% 5% 5% 6% 9% 37%	3056
	21st to end	Night	4 10% 4 9% 6% 6% 6% 4 6% 8% 36%	3150
December	1st to 10th	Night	4 12% 5% 11% 6% 6% 5% 5% 7% 8% 32%	5040
	11th to 20th	Night	3 11% 4 12% 8% 7% 6% 5% 7% 8% 29%	5700
	21st to end	Night	3 11% 4 10% 5% 5% 5% 4 6% 7% 40%	7623

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	47% 5% 12% 21% 12% 3	4125
	11th to 20th	Day	40% 5% 14% 19% 18% 3	4237
	21st to end	Day	35% 7% 15% 31% 12%	5187
February	1st to 10th	Day	49% 6% 15% 16% 10% 3	1680
	11th to 20th	Day	47% 8% 13% 21% 9% 2	1812
	21st to end	Day	46% 7% 13% 21% 10% 2	1695
March	1st to 10th	Day	40% 6% 16% 22% 16% 1	4618
	11th to 20th	Day	41% 5% 16% 23% 14% 1	5015
	21st to end	Day	61% 8% 11% 14% 6% 1	5738
April	1st to 10th	Day	55% 7% 15% 15% 7%	2567
	11th to 20th	Day	54% 5% 12% 19% 9% 1	2700
	21st to end	Day	51% 7% 13% 20% 8% 1	2730
May	1st to 10th	Day	45% 5% 10% 26% 12% 2	8118
	11th to 20th	Day	53% 8% 12% 19% 6% 1	8759
	21st to end	Day	47% 8% 15% 21% 9%	9650
June	1st to 10th	Day	51% 8% 16% 16% 8% 2	3150
	11th to 20th	Day	57% 9% 12% 15% 6% 1	3150
	21st to end	Day	40% 10% 18% 22% 8% 1	3150
July	1st to 10th	Day	33% 8% 16% 26% 15% 2	8746
	11th to 20th	Day	33% 7% 17% 27% 11% 4	8739
	21st to end	Day	29% 6% 16% 28% 17% 4	9133
August	1st to 10th	Day	38% 9% 16% 31% 7% 1	4664
	11th to 20th	Day	35% 9% 23% 27% 6% 1	4422
	21st to end	Day	30% 6% 20% 32% 11% 2	4781
September	1st to 10th	Day	35% 6% 16% 26% 13% 4	2480
	11th to 20th	Day	39% 6% 15% 26% 13% 1	2202
	21st to end	Day	37% 8% 14% 26% 12% 2	2200
October	1st to 10th	Day	35% 6% 19% 33% 6% 1	3475
	11th to 20th	Day	37% 6% 20% 22% 12% 3	2967
	21st to end	Day	39% 4 11% 32% 12% 1	3200
November	1st to 10th	Day	49% 7% 13% 19% 10% 2	1726
	11th to 20th	Day	43% 7% 16% 23% 10% 2	1561
	21st to end	Day	45% 7% 15% 22% 9% 3	1470
December	1st to 10th	Day	51% 6% 14% 19% 8% 2	2360
	11th to 20th	Day	44% 7% 22% 19% 7% 1	2714
	21st to end	Day	39% 5% 11% 22% 19% 4	3575
January	1st to 10th	Night	51% 8% 11% 18% 10% 2	8769
	11th to 20th	Night	43% 5% 16% 19% 12% 5%	8779
	21st to end	Night	41% 6% 17% 23% 12% 1	8994
February	1st to 10th	Night	50% 8% 11% 17% 13% 2	2940
	11th to 20th	Night	47% 8% 13% 18% 12% 2	2704
	21st to end	Night	45% 5% 13% 22% 13% 2	2107
March	1st to 10th	Night	41% 7% 17% 21% 11% 2	5496
	11th to 20th	Night	41% 8% 15% 21% 14% 1	5205
	21st to end	Night	56% 8% 12% 13% 9% 1	5476
April	1st to 10th	Night	49% 8% 14% 19% 10% 1	2053
	11th to 20th	Night	52% 6% 13% 20% 8% 1	1871
	21st to end	Night	49% 8% 13% 21% 7% 2	1890
May	1st to 10th	Night	47% 5% 10% 23% 14% 2	4790
	11th to 20th	Night	45% 8% 15% 23% 9%	4105
	21st to end	Night	43% 9% 17% 25% 6% 1	4526
June	1st to 10th	Night	47% 9% 15% 19% 10% 1	1470
	11th to 20th	Night	53% 9% 13% 16% 8% 2	1470
	21st to end	Night	38% 10% 20% 24% 7% 1	1470
July	1st to 10th	Night	32% 7% 18% 29% 13% 1	4105
	11th to 20th	Night	28% 6% 22% 27% 12% 4	4098
	21st to end	Night	29% 6% 20% 27% 16% 2	4627
August	1st to 10th	Night	36% 7% 15% 32% 9% 1	2681
	11th to 20th	Night	34% 7% 26% 26% 7%	2918
	21st to end	Night	30% 6% 21% 32% 10% 1	3326
September	1st to 10th	Night	32% 7% 17% 26% 13% 4	1917
	11th to 20th	Night	37% 7% 15% 26% 12% 4	2197
	21st to end	Night	34% 6% 19% 24% 13% 3	2200
October	1st to 10th	Night	34% 5% 19% 26% 15% 1	3720
	11th to 20th	Night	36% 5% 18% 26% 13% 2	4179
	21st to end	Night	37% 6% 12% 32% 13% 1	4600
November	1st to 10th	Night	46% 7% 13% 21% 11% 2	2771
	11th to 20th	Night	43% 7% 17% 20% 12% 2	3056
	21st to end	Night	43% 7% 16% 21% 10% 3	3150
December	1st to 10th	Night	49% 6% 18% 19% 7% 2	5040
	11th to 20th	Night	50% 8% 16% 17% 8% 1	5697
	21st to end	Night	41% 6% 10% 23% 16% 4	7623

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	6% 10% 32% 31% 14% 6%	220
	11th to 20th	Day	6% 10% 38% 27% 17% 1	220
	21st to end	Day	6% 12% 33% 36% 10% 3	242
February	1st to 10th	Day	8% 13% 39% 26% 9% 5%	220
	11th to 20th	Day	8% 10% 36% 35% 9% 1	308
	21st to end	Day	10% 10% 33% 30% 13% 2	411
March	1st to 10th	Day	9% 11% 39% 27% 11% 3	540
	11th to 20th	Day	11% 13% 33% 30% 9% 4	540
	21st to end	Day	14% 16% 31% 25% 9% 4	594
April	1st to 10th	Day	14% 14% 33% 26% 10% 3	540
	11th to 20th	Day	18% 14% 27% 26% 12% 3	532
	21st to end	Day	17% 14% 29% 26% 11% 3	540
May	1st to 10th	Day	18% 15% 24% 23% 17% 2	584
	11th to 20th	Day	17% 9% 25% 29% 16% 4	775
	21st to end	Day	20% 9% 18% 31% 18% 5%	844
June	1st to 10th	Day	18% 10% 28% 29% 11% 4	780
	11th to 20th	Day	24% 11% 24% 27% 11% 3	780
	21st to end	Day	14% 6% 24% 31% 19% 5%	780
July	1st to 10th	Day	13% 6% 24% 33% 20% 4	771
	11th to 20th	Day	16% 4 27% 30% 19% 3	768
	21st to end	Day	7% 6% 29% 34% 17% 6%	770
August	1st to 10th	Day	11% 7% 29% 30% 19% 4	567
	11th to 20th	Day	11% 7% 24% 37% 15% 5%	557
	21st to end	Day	12% 6% 26% 30% 19% 7%	620
September	1st to 10th	Day	14% 6% 30% 30% 15% 5%	530
	11th to 20th	Day	17% 6% 26% 30% 18% 3	530
	21st to end	Day	15% 13% 33% 25% 12% 2	530
October	1st to 10th	Day	16% 9% 31% 27% 14% 4	457
	11th to 20th	Day	12% 14% 36% 23% 11% 3	330
	21st to end	Day	13% 16% 35% 23% 10% 2	363
November	1st to 10th	Day	20% 10% 35% 27% 6% 2	330
	11th to 20th	Day	14% 13% 37% 27% 8% 1	267
	21st to end	Day	7% 11% 36% 29% 10% 7%	220
December	1st to 10th	Day	9% 8% 42% 28% 12% 2	220
	11th to 20th	Day	7% 12% 44% 25% 9% 4	220
	21st to end	Day	7% 7% 35% 33% 17% 2	242
January	1st to 10th	Night	9% 11% 40% 29% 10% 1	1050
	11th to 20th	Night	10% 9% 41% 31% 8% 1	1035
	21st to end	Night	9% 12% 39% 30% 9% 1	924
February	1st to 10th	Night	9% 8% 35% 32% 13% 3	840
	11th to 20th	Night	8% 7% 39% 34% 11% 1	824
	21st to end	Night	6% 7% 37% 29% 17% 3	692
March	1st to 10th	Night	8% 6% 37% 36% 11% 3	840
	11th to 20th	Night	9% 8% 38% 34% 11% 1	840
	21st to end	Night	12% 7% 33% 34% 12% 2	924
April	1st to 10th	Night	14% 7% 31% 31% 14% 1	793
	11th to 20th	Night	17% 8% 33% 32% 10%	623
	21st to end	Night	15% 9% 29% 36% 11%	630
May	1st to 10th	Night	21% 7% 24% 36% 11% 1	490
	11th to 20th	Night	15% 5% 26% 37% 16%	414
	21st to end	Night	20% 5% 20% 36% 18% 1	455
June	1st to 10th	Night	20% 7% 23% 34% 14% 1	420
	11th to 20th	Night	19% 7% 26% 35% 12% 1	420
	21st to end	Night	13% 4 20% 40% 22% 2	420
July	1st to 10th	Night	11% 3 17% 43% 24% 1	410
	11th to 20th	Night	11% 4 25% 38% 20% 1	408
	21st to end	Night	8% 5% 17% 45% 24% 2	460
August	1st to 10th	Night	13% 4 14% 40% 27% 2	418
	11th to 20th	Night	11% 2 15% 46% 23% 2	562
	21st to end	Night	10% 4 21% 43% 21% 1	687
September	1st to 10th	Night	15% 4 21% 38% 20% 3	717
	11th to 20th	Night	17% 3 19% 41% 19% 2	800
	21st to end	Night	12% 6% 33% 35% 12% 2	800
October	1st to 10th	Night	15% 4 30% 34% 14% 1	800
	11th to 20th	Night	13% 6% 35% 33% 12% 2	800
	21st to end	Night	12% 9% 37% 34% 8% 1	880
November	1st to 10th	Night	14% 10% 40% 26% 9% 1	926
	11th to 20th	Night	9% 10% 46% 28% 6% 1	1050
	21st to end	Night	7% 8% 42% 32% 9% 1	1050
December	1st to 10th	Night	10% 10% 40% 29% 10% 2	1050
	11th to 20th	Night	6% 10% 41% 35% 8% 1	1050
	21st to end	Night	9% 8% 40% 31% 10% 2	1155

Page generated at 2026-08-27 02:07:13. Version ac07

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