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 2024-03-06.

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	10% 9% 4 7% 6% 4 5% 5% 6% 8% 35%	77957
	Night	7% 9% 4 8% 7% 4 5% 6% 6% 8% 36%	81511
Transparency	Day	44% 8% 15% 21% 9% 2	77663
	Night	43% 8% 15% 21% 10% 2	81385
Seeing	Day	14% 8% 28% 30% 15% 4	14330
	Night	11% 6% 32% 35% 13% 2	23628

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	2 8% 7% 12% 6% 4 5% 5% 6% 10% 35%	2219
	11th to 20th	Day	3 8% 4 10% 7% 4 6% 7% 8% 7% 35%	2240
	21st to end	Day	4 7% 4 7% 6% 4 5% 6% 6% 10% 40%	2794
February	1st to 10th	Day	4 10% 6% 10% 9% 4 6% 6% 7% 8% 30%	1520
	11th to 20th	Day	4 11% 4 10% 9% 5% 6% 7% 6% 7% 31%	1627
	21st to end	Day	4 10% 7% 10% 8% 4 7% 5% 6% 8% 30%	1537
March	1st to 10th	Day	3 12% 6% 10% 9% 4 6% 6% 6% 8% 31%	1851
	11th to 20th	Day	5% 10% 5% 8% 5% 3 7% 6% 7% 10% 34%	1938
	21st to end	Day	7% 15% 6% 10% 7% 4 6% 6% 6% 7% 25%	2229
April	1st to 10th	Day	8% 14% 7% 10% 8% 4 6% 6% 7% 8% 23%	2200
	11th to 20th	Day	12% 18% 6% 9% 5% 3 4 4 5% 8% 27%	2310
	21st to end	Day	12% 13% 4 8% 6% 4 5% 5% 5% 8% 29%	2340
May	1st to 10th	Day	15% 13% 5% 9% 7% 4 6% 5% 6% 7% 25%	2491
	11th to 20th	Day	13% 7% 3 7% 7% 4 6% 5% 6% 8% 33%	2654
	21st to end	Day	22% 9% 3 7% 7% 3 6% 5% 6% 7% 25%	2917
June	1st to 10th	Day	18% 8% 3 7% 7% 4 6% 7% 7% 8% 25%	2700
	11th to 20th	Day	23% 9% 4 8% 7% 4 6% 6% 6% 6% 21%	2700
	21st to end	Day	11% 6% 3 6% 6% 3 7% 6% 8% 9% 35%	2700
July	1st to 10th	Day	12% 6% 3 7% 7% 4 6% 5% 7% 9% 36%	2700
	11th to 20th	Day	14% 5% 2 5% 5% 3 6% 5% 7% 7% 42%	2700
	21st to end	Day	8% 4 2 5% 5% 3 5% 6% 7% 9% 48%	2871
August	1st to 10th	Day	12% 6% 2 5% 5% 3 5% 5% 6% 8% 43%	2507
	11th to 20th	Day	10% 5% 1 5% 4 3 5% 5% 7% 9% 46%	2350
	21st to end	Day	12% 5% 2 5% 5% 3 5% 5% 7% 8% 45%	2574
September	1st to 10th	Day	12% 7% 3 5% 5% 3 4 5% 5% 8% 45%	2232
	11th to 20th	Day	15% 9% 2 4 4 3 5% 5% 5% 6% 43%	1982
	21st to end	Day	10% 8% 3 6% 5% 3 5% 5% 5% 7% 42%	1980
October	1st to 10th	Day	13% 10% 4 6% 5% 2 4 5% 7% 6% 38%	1915
	11th to 20th	Day	10% 9% 4 8% 5% 4 5% 5% 6% 9% 36%	1641
	21st to end	Day	8% 10% 5% 7% 7% 4 6% 4 7% 8% 34%	1782
November	1st to 10th	Day	7% 13% 6% 8% 5% 4 6% 6% 5% 6% 33%	1559
	11th to 20th	Day	4 11% 4 8% 7% 3 5% 5% 6% 8% 39%	1413
	21st to end	Day	4 12% 5% 7% 7% 4 4 4 7% 9% 37%	1330
December	1st to 10th	Day	5% 11% 5% 10% 7% 4 6% 5% 7% 7% 33%	1330
	11th to 20th	Day	3 10% 5% 12% 8% 4 6% 7% 7% 9% 29%	1682
	21st to end	Day	3 9% 4 8% 7% 4 4 6% 5% 8% 43%	2442
January	1st to 10th	Night	2 12% 6% 11% 9% 5% 6% 6% 6% 9% 26%	4726
	11th to 20th	Night	3 7% 5% 12% 8% 4 6% 8% 7% 7% 33%	4686
	21st to end	Night	3 11% 4 10% 7% 4 6% 5% 7% 10% 34%	4862
February	1st to 10th	Night	5% 10% 5% 10% 9% 5% 6% 5% 6% 7% 31%	2660
	11th to 20th	Night	4 12% 5% 10% 8% 5% 6% 5% 7% 8% 30%	2440
	21st to end	Night	2 10% 5% 11% 8% 4 6% 6% 6% 8% 35%	1913
March	1st to 10th	Night	3 11% 5% 9% 8% 6% 6% 6% 9% 8% 29%	2225
	11th to 20th	Night	4 10% 5% 7% 6% 4 5% 7% 6% 9% 36%	2021
	21st to end	Night	5% 12% 5% 9% 7% 4 6% 7% 6% 9% 29%	2124
April	1st to 10th	Night	7% 14% 5% 9% 7% 4 5% 6% 6% 8% 30%	1760
	11th to 20th	Night	10% 15% 5% 9% 7% 4 4 5% 5% 7% 30%	1601
	21st to end	Night	10% 11% 4 8% 7% 4 6% 5% 7% 8% 30%	1620
May	1st to 10th	Night	14% 11% 5% 8% 5% 4 5% 5% 6% 6% 32%	1465
	11th to 20th	Night	10% 7% 3 7% 5% 3 5% 5% 6% 9% 40%	1239
	21st to end	Night	20% 8% 3 5% 5% 4 5% 5% 6% 8% 32%	1358
June	1st to 10th	Night	18% 9% 3 5% 5% 4 5% 5% 6% 8% 32%	1260
	11th to 20th	Night	21% 7% 4 7% 8% 4 6% 4 5% 7% 27%	1260
	21st to end	Night	9% 6% 3 5% 6% 4 7% 6% 7% 9% 39%	1260
July	1st to 10th	Night	9% 5% 2 4 6% 3 6% 6% 8% 10% 41%	1260
	11th to 20th	Night	11% 5% 2 5% 6% 3 5% 6% 6% 9% 42%	1260
	21st to end	Night	6% 4 2 4 3 2 4 3 6% 9% 57%	1443
August	1st to 10th	Night	10% 6% 3 5% 4 3 5% 4 7% 9% 45%	1432
	11th to 20th	Night	10% 5% 2 4 4 3 3 5% 6% 10% 48%	1549
	21st to end	Night	10% 5% 2 4 4 3 4 4 6% 9% 48%	1782
September	1st to 10th	Night	12% 7% 2 4 5% 2 4 4 7% 8% 46%	1725
	11th to 20th	Night	15% 8% 2 4 4 3 3 5% 5% 8% 44%	1977
	21st to end	Night	10% 8% 2 4 5% 3 4 5% 6% 7% 44%	1980
October	1st to 10th	Night	11% 9% 3 5% 6% 3 5% 5% 6% 7% 40%	2044
	11th to 20th	Night	8% 9% 3 7% 5% 4 5% 6% 5% 8% 40%	2317
	21st to end	Night	7% 10% 3 8% 7% 4 6% 5% 6% 8% 36%	2574
November	1st to 10th	Night	7% 14% 4 7% 6% 3 6% 5% 7% 7% 34%	2500
	11th to 20th	Night	4 10% 4 8% 7% 4 6% 6% 6% 9% 38%	2764
	21st to end	Night	4 8% 5% 9% 7% 5% 6% 6% 6% 8% 36%	2850
December	1st to 10th	Night	5% 11% 6% 10% 7% 4 6% 4 6% 8% 34%	2850
	11th to 20th	Night	2 9% 5% 10% 9% 6% 6% 7% 7% 9% 32%	3510
	21st to end	Night	3 9% 4 8% 7% 4 5% 6% 6% 7% 43%	5214

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	43% 6% 13% 25% 11% 3	2219
	11th to 20th	Day	43% 8% 10% 16% 18% 4	2261
	21st to end	Day	35% 10% 15% 31% 8% 1	2794
February	1st to 10th	Day	49% 7% 16% 17% 8% 3	1520
	11th to 20th	Day	48% 9% 14% 20% 8% 2	1636
	21st to end	Day	48% 8% 13% 20% 10% 1	1537
March	1st to 10th	Day	49% 8% 17% 17% 8% 1	1851
	11th to 20th	Day	43% 7% 15% 22% 10% 2	1939
	21st to end	Day	55% 10% 13% 16% 6% 1	2229
April	1st to 10th	Day	55% 8% 16% 14% 7%	2200
	11th to 20th	Day	56% 5% 11% 18% 9% 1	2310
	21st to end	Day	51% 8% 14% 19% 7% 1	2340
May	1st to 10th	Day	54% 8% 14% 17% 6%	2491
	11th to 20th	Day	44% 9% 15% 22% 10% 1	2658
	21st to end	Day	55% 8% 13% 18% 5% 1	2918
June	1st to 10th	Day	53% 8% 16% 15% 6% 1	2700
	11th to 20th	Day	58% 9% 12% 14% 5% 1	2700
	21st to end	Day	40% 11% 18% 22% 7% 1	2700
July	1st to 10th	Day	42% 9% 17% 21% 9% 2	2626
	11th to 20th	Day	38% 10% 19% 24% 8% 1	2619
	21st to end	Day	29% 10% 18% 30% 11% 1	2711
August	1st to 10th	Day	37% 10% 18% 26% 8% 1	2490
	11th to 20th	Day	32% 9% 22% 26% 9% 2	2350
	21st to end	Day	33% 9% 18% 28% 10% 2	2574
September	1st to 10th	Day	37% 6% 17% 25% 12% 3	2232
	11th to 20th	Day	41% 6% 14% 26% 12% 1	1982
	21st to end	Day	39% 8% 14% 24% 12% 2	1980
October	1st to 10th	Day	44% 7% 14% 25% 9% 1	1915
	11th to 20th	Day	42% 7% 16% 23% 9% 2	1641
	21st to end	Day	46% 7% 14% 21% 11% 1	1782
November	1st to 10th	Day	50% 8% 13% 19% 9% 2	1559
	11th to 20th	Day	43% 7% 16% 23% 10% 2	1413
	21st to end	Day	42% 7% 16% 22% 9% 3	1330
December	1st to 10th	Day	48% 7% 14% 15% 13% 3	1330
	11th to 20th	Day	47% 9% 18% 17% 8% 2	1684
	21st to end	Day	37% 6% 12% 21% 19% 5%	2442
January	1st to 10th	Night	50% 10% 12% 18% 8% 2	4726
	11th to 20th	Night	46% 7% 11% 16% 13% 6%	4727
	21st to end	Night	42% 8% 15% 22% 11% 1	4862
February	1st to 10th	Night	50% 8% 11% 18% 11% 2	2660
	11th to 20th	Night	47% 8% 14% 18% 11% 2	2441
	21st to end	Night	45% 5% 13% 21% 13% 2	1913
March	1st to 10th	Night	46% 10% 14% 22% 7% 1	2225
	11th to 20th	Night	42% 8% 15% 20% 13% 1	2021
	21st to end	Night	49% 9% 16% 18% 7% 1	2124
April	1st to 10th	Night	50% 8% 14% 17% 10% 1	1760
	11th to 20th	Night	53% 7% 13% 19% 8% 1	1601
	21st to end	Night	49% 9% 14% 19% 6% 2	1620
May	1st to 10th	Night	51% 6% 15% 19% 9% 1	1465
	11th to 20th	Night	39% 7% 17% 26% 10%	1239
	21st to end	Night	47% 8% 17% 21% 6% 1	1358
June	1st to 10th	Night	48% 9% 15% 18% 9%	1260
	11th to 20th	Night	53% 9% 14% 15% 7% 2	1260
	21st to end	Night	38% 11% 19% 24% 7% 1	1260
July	1st to 10th	Night	35% 11% 21% 22% 10% 1	1225
	11th to 20th	Night	36% 11% 20% 22% 9% 1	1218
	21st to end	Night	25% 8% 19% 33% 15% 1	1363
August	1st to 10th	Night	34% 10% 19% 29% 7% 1	1424
	11th to 20th	Night	30% 8% 24% 27% 10% 1	1549
	21st to end	Night	31% 8% 17% 29% 13% 2	1782
September	1st to 10th	Night	34% 8% 17% 25% 13% 3	1725
	11th to 20th	Night	37% 8% 15% 25% 12% 4	1977
	21st to end	Night	35% 7% 19% 22% 13% 3	1980
October	1st to 10th	Night	42% 7% 15% 23% 11% 2	2044
	11th to 20th	Night	39% 8% 17% 23% 10% 3	2317
	21st to end	Night	44% 9% 15% 22% 10% 1	2574
November	1st to 10th	Night	46% 8% 13% 20% 11% 2	2500
	11th to 20th	Night	42% 7% 17% 20% 12% 2	2764
	21st to end	Night	42% 7% 17% 20% 10% 4	2850
December	1st to 10th	Night	47% 6% 14% 20% 10% 3	2850
	11th to 20th	Night	45% 10% 16% 21% 7% 1	3507
	21st to end	Night	37% 8% 12% 23% 14% 6%	5214

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% 8% 31% 34% 14% 7%	180
	11th to 20th	Day	4 8% 36% 32% 19% 2	180
	21st to end	Day	6% 9% 31% 39% 12% 4	198
February	1st to 10th	Day	8% 13% 38% 26% 10% 6%	180
	11th to 20th	Day	9% 8% 35% 36% 11% 1	252
	21st to end	Day	7% 9% 32% 34% 15% 3	349
March	1st to 10th	Day	8% 12% 38% 27% 11% 3	441
	11th to 20th	Day	10% 13% 30% 31% 11% 5%	420
	21st to end	Day	14% 12% 33% 25% 11% 5%	462
April	1st to 10th	Day	13% 14% 34% 28% 10% 2	420
	11th to 20th	Day	19% 11% 24% 27% 15% 3	412
	21st to end	Day	18% 13% 28% 27% 12% 2	420
May	1st to 10th	Day	18% 14% 23% 24% 19% 2	458
	11th to 20th	Day	17% 7% 24% 30% 17% 4	625
	21st to end	Day	22% 7% 17% 30% 20% 4	679
June	1st to 10th	Day	18% 8% 27% 31% 12% 4	630
	11th to 20th	Day	26% 10% 23% 27% 11% 3	630
	21st to end	Day	13% 5% 24% 32% 21% 6%	630
July	1st to 10th	Day	13% 6% 22% 33% 22% 5%	621
	11th to 20th	Day	17% 2 26% 31% 21% 3	618
	21st to end	Day	7% 6% 28% 35% 18% 6%	617
August	1st to 10th	Day	12% 6% 28% 31% 18% 5%	447
	11th to 20th	Day	12% 5% 24% 37% 16% 6%	437
	21st to end	Day	12% 6% 25% 31% 19% 7%	495
September	1st to 10th	Day	16% 7% 32% 29% 14% 4	450
	11th to 20th	Day	17% 6% 27% 29% 16% 3	450
	21st to end	Day	16% 10% 30% 28% 13% 2	450
October	1st to 10th	Day	17% 8% 30% 27% 14% 5%	385
	11th to 20th	Day	14% 11% 34% 25% 13% 3	270
	21st to end	Day	13% 14% 35% 25% 11% 1	297
November	1st to 10th	Day	20% 8% 34% 29% 7% 3	270
	11th to 20th	Day	13% 13% 36% 29% 8% 1	219
	21st to end	Day	7% 9% 35% 30% 11% 7%	180
December	1st to 10th	Day	8% 6% 39% 30% 14% 3	180
	11th to 20th	Day	4 9% 46% 27% 10% 3	180
	21st to end	Day	7% 6% 33% 34% 18% 2	198
January	1st to 10th	Night	9% 10% 39% 30% 11% 1	950
	11th to 20th	Night	9% 7% 41% 34% 9% 1	937
	21st to end	Night	9% 12% 37% 32% 10% 1	836
February	1st to 10th	Night	9% 8% 34% 32% 14% 3	760
	11th to 20th	Night	8% 7% 37% 36% 11% 1	744
	21st to end	Night	5% 6% 36% 31% 19% 3	628
March	1st to 10th	Night	8% 5% 36% 37% 11% 3	742
	11th to 20th	Night	8% 7% 37% 35% 12% 2	720
	21st to end	Night	12% 5% 32% 35% 13% 2	792
April	1st to 10th	Night	13% 7% 31% 33% 15% 2	680
	11th to 20th	Night	18% 6% 33% 33% 11%	533
	21st to end	Night	15% 8% 30% 36% 11%	540
May	1st to 10th	Night	20% 8% 23% 36% 13% 1	421
	11th to 20th	Night	14% 3 26% 39% 17% 1	354
	21st to end	Night	21% 4 19% 37% 19% 1	389
June	1st to 10th	Night	21% 6% 21% 36% 14% 2	360
	11th to 20th	Night	21% 6% 24% 35% 13% 2	360
	21st to end	Night	12% 3 19% 41% 23% 2	360
July	1st to 10th	Night	12% 3 17% 43% 25% 1	350
	11th to 20th	Night	11% 4 23% 39% 20% 2	348
	21st to end	Night	7% 5% 16% 45% 26% 2	394
August	1st to 10th	Night	13% 3 13% 40% 28% 3	358
	11th to 20th	Night	11% 2 15% 46% 24% 2	481
	21st to end	Night	11% 3 20% 42% 23% 1	594
September	1st to 10th	Night	17% 4 21% 36% 19% 3	645
	11th to 20th	Night	17% 3 19% 41% 18% 2	720
	21st to end	Night	13% 5% 31% 36% 13% 2	720
October	1st to 10th	Night	17% 4 28% 34% 15% 2	720
	11th to 20th	Night	13% 4 35% 34% 12% 2	720
	21st to end	Night	11% 7% 36% 36% 8% 1	792
November	1st to 10th	Night	14% 8% 39% 28% 10% 1	835
	11th to 20th	Night	9% 9% 46% 29% 6% 1	950
	21st to end	Night	7% 8% 43% 32% 9% 1	950
December	1st to 10th	Night	10% 8% 39% 31% 11% 2	950
	11th to 20th	Night	4 8% 41% 37% 9% 1	950
	21st to end	Night	10% 7% 38% 33% 11% 2	1045

Page generated at 2024-03-03 04:28:58. Version ac07

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