Young's Pond
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Young's Pond clear sky chart from 2005-11-06 to 2024-12-02.

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	17% 7% 2 6% 4 4 4 4 5% 7% 40%	101449
	Night	19% 8% 2 6% 4 4 4 3 5% 6% 40%	98184
Transparency	Day	40% 7% 13% 23% 15% 2	105009
	Night	43% 6% 12% 22% 15% 2	102712
Seeing	Day	17% 10% 28% 28% 13% 3	15132
	Night	20% 10% 30% 28% 10% 1	24188

By Month

Percentage Cloud Cover NE (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	16% 7% 2 6% 4 4 3 3 4 4 46%	2517
	11th to 20th	Day	17% 9% 3 7% 5% 4 4 4 5% 5% 38%	2520
	21st to end	Day	22% 11% 3 7% 4 4 4 4 4 5% 33%	2845
February	1st to 10th	Day	17% 8% 2 6% 4 4 5% 4 5% 6% 38%	1788
	11th to 20th	Day	16% 6% 2 6% 4 4 4 3 6% 7% 43%	1848
	21st to end	Day	21% 8% 2 6% 4 3 3 3 5% 6% 37%	1570
March	1st to 10th	Day	27% 9% 2 6% 4 4 3 2 4 5% 35%	3116
	11th to 20th	Day	10% 5% 2 5% 5% 4 5% 4 6% 8% 46%	3246
	21st to end	Day	21% 7% 2 6% 4 4 4 4 5% 6% 39%	4166
April	1st to 10th	Day	19% 8% 2 5% 4 4 4 4 5% 7% 39%	2280
	11th to 20th	Day	20% 6% 2 5% 4 4 3 3 5% 6% 42%	2254
	21st to end	Day	20% 5% 2 5% 4 4 4 3 5% 5% 41%	2384
May	1st to 10th	Day	28% 10% 2 5% 3 3 3 3 5% 7% 31%	4106
	11th to 20th	Day	23% 7% 2 6% 4 4 4 3 5% 7% 34%	4235
	21st to end	Day	15% 6% 2 5% 3 3 4 3 6% 8% 46%	4837
June	1st to 10th	Day	18% 6% 2 5% 4 5% 4 4 6% 9% 36%	2660
	11th to 20th	Day	16% 6% 2 4 3 5% 4 4 6% 10% 39%	2660
	21st to end	Day	13% 7% 2 5% 5% 5% 5% 4 6% 8% 42%	2660
July	1st to 10th	Day	13% 6% 2 7% 5% 5% 5% 4 7% 9% 36%	4440
	11th to 20th	Day	14% 6% 2 5% 4 4 5% 4 6% 9% 40%	4440
	21st to end	Day	17% 8% 3 6% 5% 4 5% 5% 5% 7% 35%	4814
August	1st to 10th	Day	19% 7% 3 6% 4 5% 5% 4 6% 8% 34%	4238
	11th to 20th	Day	12% 6% 2 6% 5% 3 3 4 6% 8% 45%	3743
	21st to end	Day	8% 5% 2 6% 4 5% 5% 4 7% 10% 45%	4180
September	1st to 10th	Day	13% 6% 2 6% 4 4 4 4 5% 6% 47%	2280
	11th to 20th	Day	13% 5% 2 5% 4 4 3 3 5% 6% 52%	2142
	21st to end	Day	20% 6% 2 5% 4 3 4 3 4 6% 41%	2090
October	1st to 10th	Day	21% 7% 2 5% 4 3 4 3 4 6% 42%	2071
	11th to 20th	Day	14% 6% 2 4 3 3 4 3 5% 8% 48%	1881
	21st to end	Day	19% 6% 2 5% 4 4 4 4 6% 6% 41%	1881
November	1st to 10th	Day	14% 6% 2 5% 4 4 3 2 4 5% 50%	1761
	11th to 20th	Day	19% 6% 1 4 2 3 3 3 4 6% 49%	1800
	21st to end	Day	17% 7% 2 4 3 3 4 3 4 7% 45%	1790
December	1st to 10th	Day	20% 6% 1 6% 4 5% 4 3 6% 6% 39%	1528
	11th to 20th	Day	23% 6% 2 4 3 3 2 2 3 6% 45%	1906
	21st to end	Day	20% 11% 3 7% 4 4 4 4 4 5% 34%	2772
January	1st to 10th	Night	17% 6% 2 4 3 3 3 3 5% 6% 47%	4429
	11th to 20th	Night	18% 9% 2 7% 3 3 3 2 4 5% 43%	4440
	21st to end	Night	25% 11% 3 7% 4 3 4 3 4 5% 33%	4806
February	1st to 10th	Night	16% 9% 3 6% 4 4 3 4 4 6% 41%	2390
	11th to 20th	Night	17% 8% 3 5% 4 3 3 4 5% 7% 41%	2218
	21st to end	Night	21% 8% 2 5% 4 3 3 3 4 5% 41%	1884
March	1st to 10th	Night	26% 11% 2 5% 3 3 3 3 4 5% 35%	3724
	11th to 20th	Night	12% 7% 3 6% 4 5% 5% 3 5% 7% 43%	3708
	21st to end	Night	22% 8% 2 5% 3 3 3 3 5% 5% 40%	3466
April	1st to 10th	Night	19% 8% 2 7% 4 4 4 3 5% 7% 37%	1900
	11th to 20th	Night	20% 5% 2 7% 4 4 3 3 4 6% 41%	1875
	21st to end	Night	21% 7% 2 5% 5% 4 4 3 4 5% 41%	1795
May	1st to 10th	Night	25% 11% 4 7% 4 4 4 3 5% 7% 28%	2834
	11th to 20th	Night	24% 8% 3 7% 5% 4 5% 4 5% 7% 29%	2687
	21st to end	Night	19% 8% 2 4 4 4 3 3 5% 7% 41%	2738
June	1st to 10th	Night	19% 6% 2 6% 5% 4 5% 3 4 6% 39%	1520
	11th to 20th	Night	17% 7% 2 5% 4 4 4 3 6% 9% 40%	1520
	21st to end	Night	13% 7% 2 5% 4 5% 4 3 6% 9% 41%	1520
July	1st to 10th	Night	15% 8% 3 7% 5% 4 5% 4 6% 8% 35%	2520
	11th to 20th	Night	18% 6% 2 6% 4 4 4 4 7% 9% 35%	2520
	21st to end	Night	20% 8% 3 6% 4 4 4 4 5% 7% 33%	2739
August	1st to 10th	Night	23% 7% 3 7% 5% 4 5% 4 7% 7% 28%	2661
	11th to 20th	Night	13% 7% 3 7% 5% 4 5% 4 6% 7% 40%	3067
	21st to end	Night	9% 4 2 4 3 3 4 3 5% 8% 54%	3476
September	1st to 10th	Night	14% 6% 3 6% 4 5% 4 3 5% 7% 44%	1900
	11th to 20th	Night	14% 5% 2 4 3 3 3 3 4 6% 53%	2038
	21st to end	Night	19% 6% 3 6% 3 5% 4 3 4 6% 42%	2090
October	1st to 10th	Night	20% 8% 2 6% 4 4 3 3 4 6% 41%	2105
	11th to 20th	Night	15% 5% 2 5% 4 3 4 3 4 5% 49%	2297
	21st to end	Night	21% 7% 2 5% 3 4 3 3 5% 6% 41%	2717
November	1st to 10th	Night	12% 6% 2 5% 4 4 4 3 5% 5% 50%	2537
	11th to 20th	Night	19% 6% 2 5% 3 3 3 2 4 5% 48%	2600
	21st to end	Night	16% 6% 2 4 4 4 4 3 5% 7% 46%	2605
December	1st to 10th	Night	21% 7% 2 5% 4 4 4 3 5% 5% 39%	2686
	11th to 20th	Night	21% 7% 2 4 3 4 4 3 4 6% 41%	3288
	21st to end	Night	22% 10% 3 6% 4 3 4 3 4 5% 36%	4884

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	39% 4 10% 32% 12% 2	2518
	11th to 20th	Day	45% 7% 12% 25% 10% 1	2520
	21st to end	Day	50% 7% 11% 21% 10% 2	2845
February	1st to 10th	Day	44% 6% 15% 21% 13% 2	1788
	11th to 20th	Day	38% 6% 12% 25% 16% 2	1857
	21st to end	Day	46% 7% 11% 20% 14% 3	1570
March	1st to 10th	Day	49% 6% 13% 19% 11% 2	3119
	11th to 20th	Day	29% 7% 17% 32% 14% 1	3246
	21st to end	Day	43% 5% 8% 18% 20% 5%	4166
April	1st to 10th	Day	42% 8% 11% 20% 16% 4	2280
	11th to 20th	Day	41% 6% 11% 21% 18% 3	2254
	21st to end	Day	41% 7% 10% 21% 16% 3	2384
May	1st to 10th	Day	51% 7% 15% 14% 11% 1	4120
	11th to 20th	Day	47% 7% 17% 18% 9% 2	4239
	21st to end	Day	33% 9% 14% 25% 18% 2	4837
June	1st to 10th	Day	41% 8% 13% 24% 13% 1	2660
	11th to 20th	Day	38% 8% 16% 24% 13% 1	2660
	21st to end	Day	36% 9% 15% 25% 14% 1	2660
July	1st to 10th	Day	42% 10% 13% 19% 15% 1	4370
	11th to 20th	Day	38% 8% 18% 22% 14% 1	4365
	21st to end	Day	46% 8% 13% 17% 15% 2	4661
August	1st to 10th	Day	46% 7% 17% 22% 8%	4224
	11th to 20th	Day	35% 7% 16% 31% 11% 1	3779
	21st to end	Day	30% 9% 14% 29% 17% 2	4180
September	1st to 10th	Day	35% 9% 13% 22% 19% 2	2280
	11th to 20th	Day	31% 6% 12% 24% 24% 2	2142
	21st to end	Day	43% 6% 10% 19% 19% 3	2090
October	1st to 10th	Day	34% 6% 11% 21% 23% 6%	3448
	11th to 20th	Day	26% 4 10% 25% 31% 4	3109
	21st to end	Day	31% 5% 15% 26% 21% 3	3081
November	1st to 10th	Day	37% 4 15% 21% 21% 2	1761
	11th to 20th	Day	37% 5% 12% 22% 22% 3	1800
	21st to end	Day	39% 4 15% 28% 12% 3	1790
December	1st to 10th	Day	45% 6% 15% 19% 14% 1	1528
	11th to 20th	Day	42% 3 16% 19% 18% 2	1906
	21st to end	Day	51% 7% 11% 22% 9% 1	2772
January	1st to 10th	Night	39% 4 12% 30% 11% 4	4429
	11th to 20th	Night	45% 4 12% 23% 13% 3	4440
	21st to end	Night	53% 6% 9% 20% 11% 2	4806
February	1st to 10th	Night	45% 6% 12% 23% 12% 2	2390
	11th to 20th	Night	43% 5% 10% 21% 17% 4	2220
	21st to end	Night	45% 4 9% 23% 15% 4	1884
March	1st to 10th	Night	52% 4 10% 20% 11% 2	3734
	11th to 20th	Night	37% 7% 16% 23% 14% 3	3709
	21st to end	Night	46% 4 9% 12% 24% 6%	3466
April	1st to 10th	Night	46% 5% 11% 20% 15% 3	1900
	11th to 20th	Night	44% 5% 10% 20% 19% 1	1875
	21st to end	Night	45% 5% 10% 20% 16% 4	1795
May	1st to 10th	Night	55% 7% 13% 14% 10% 1	2840
	11th to 20th	Night	53% 9% 14% 14% 9% 1	2688
	21st to end	Night	41% 8% 15% 23% 12% 1	2739
June	1st to 10th	Night	45% 6% 11% 20% 17% 2	1520
	11th to 20th	Night	39% 7% 15% 27% 11% 1	1520
	21st to end	Night	39% 7% 15% 24% 14%	1520
July	1st to 10th	Night	46% 9% 13% 18% 12% 1	2480
	11th to 20th	Night	43% 8% 16% 22% 10% 1	2472
	21st to end	Night	48% 7% 14% 14% 15% 2	2651
August	1st to 10th	Night	51% 9% 15% 16% 8% 1	2651
	11th to 20th	Night	42% 8% 15% 27% 8% 1	3096
	21st to end	Night	27% 7% 15% 32% 19% 1	3476
September	1st to 10th	Night	39% 8% 10% 25% 17% 2	1900
	11th to 20th	Night	33% 5% 11% 24% 25% 3	2038
	21st to end	Night	44% 6% 9% 19% 20% 2	2090
October	1st to 10th	Night	39% 6% 12% 23% 18% 2	3508
	11th to 20th	Night	25% 4 11% 26% 31% 4	3808
	21st to end	Night	32% 4 14% 26% 21% 2	4467
November	1st to 10th	Night	36% 6% 12% 22% 20% 4	2537
	11th to 20th	Night	40% 4 10% 23% 19% 4	2600
	21st to end	Night	38% 5% 13% 29% 13% 2	2605
December	1st to 10th	Night	46% 5% 13% 21% 14% 1	2686
	11th to 20th	Night	44% 5% 14% 19% 16% 2	3288
	21st to end	Night	48% 6% 12% 23% 10% 1	4884

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	18% 19% 33% 24% 4 1	180
	11th to 20th	Day	16% 26% 38% 16% 3 1	180
	21st to end	Day	19% 18% 35% 19% 8% 1	220
February	1st to 10th	Day	21% 17% 40% 18% 3	348
	11th to 20th	Day	18% 21% 40% 19% 2	456
	21st to end	Day	23% 20% 32% 20% 5%	382
March	1st to 10th	Day	18% 19% 33% 26% 5%	460
	11th to 20th	Day	16% 14% 44% 20% 5% 1	460
	21st to end	Day	21% 17% 38% 18% 6% 1	506
April	1st to 10th	Day	23% 13% 36% 20% 8% 1	460
	11th to 20th	Day	21% 12% 33% 25% 8% 1	452
	21st to end	Day	23% 11% 32% 27% 5% 2	460
May	1st to 10th	Day	25% 12% 30% 24% 7% 2	463
	11th to 20th	Day	19% 7% 31% 31% 11% 1	487
	21st to end	Day	18% 6% 20% 32% 19% 4	529
June	1st to 10th	Day	17% 6% 23% 33% 18% 3	490
	11th to 20th	Day	15% 5% 23% 38% 16% 3	490
	21st to end	Day	13% 5% 25% 34% 19% 4	490
July	1st to 10th	Day	14% 3 19% 34% 25% 5%	485
	11th to 20th	Day	12% 4 13% 39% 25% 6%	484
	21st to end	Day	14% 3 20% 41% 20% 2	532
August	1st to 10th	Day	11% 3 18% 38% 23% 6%	486
	11th to 20th	Day	12% 4 16% 39% 24% 6%	479
	21st to end	Day	9% 4 21% 36% 22% 7%	539
September	1st to 10th	Day	16% 5% 24% 27% 21% 8%	490
	11th to 20th	Day	13% 4 23% 30% 21% 9%	490
	21st to end	Day	21% 7% 28% 28% 14% 3	490
October	1st to 10th	Day	24% 8% 22% 24% 16% 6%	490
	11th to 20th	Day	13% 11% 31% 29% 14% 3	480
	21st to end	Day	23% 10% 29% 26% 9% 2	429
November	1st to 10th	Day	13% 12% 30% 30% 11% 3	395
	11th to 20th	Day	19% 17% 34% 23% 7%	400
	21st to end	Day	18% 19% 29% 26% 8%	390
December	1st to 10th	Day	18% 18% 32% 23% 8% 1	182
	11th to 20th	Day	25% 21% 29% 20% 4	180
	21st to end	Day	23% 15% 36% 17% 8% 2	198
January	1st to 10th	Night	19% 18% 38% 20% 4	760
	11th to 20th	Night	26% 17% 34% 20% 3	760
	21st to end	Night	20% 17% 39% 22% 2	836
February	1st to 10th	Night	20% 14% 39% 25% 2	760
	11th to 20th	Night	22% 15% 43% 18% 2	743
	21st to end	Night	25% 14% 37% 20% 4	628
March	1st to 10th	Night	22% 13% 36% 24% 5%	760
	11th to 20th	Night	20% 11% 38% 24% 6% 1	760
	21st to end	Night	22% 12% 36% 25% 5%	836
April	1st to 10th	Night	22% 10% 33% 29% 5%	760
	11th to 20th	Night	21% 7% 35% 29% 7%	751
	21st to end	Night	22% 6% 34% 29% 7% 1	655
May	1st to 10th	Night	24% 9% 28% 28% 10% 1	570
	11th to 20th	Night	22% 7% 32% 30% 8%	488
	21st to end	Night	19% 5% 18% 39% 18% 1	411
June	1st to 10th	Night	18% 6% 24% 34% 16% 2	380
	11th to 20th	Night	19% 3 18% 43% 17% 1	380
	21st to end	Night	13% 4 22% 44% 17% 1	380
July	1st to 10th	Night	14% 3 18% 41% 23% 2	370
	11th to 20th	Night	13% 3 15% 45% 21% 3	368
	21st to end	Night	15% 3 18% 46% 17% 2	416
August	1st to 10th	Night	11% 2 18% 47% 21% 1	468
	11th to 20th	Night	13% 2 17% 39% 25% 4	732
	21st to end	Night	14% 3 18% 37% 24% 4	836
September	1st to 10th	Night	16% 3 25% 32% 19% 4	760
	11th to 20th	Night	16% 4 22% 32% 21% 6%	760
	21st to end	Night	20% 5% 25% 32% 16% 2	760
October	1st to 10th	Night	23% 8% 26% 26% 14% 3	760
	11th to 20th	Night	17% 11% 31% 30% 10% 1	760
	21st to end	Night	25% 11% 32% 23% 8%	836
November	1st to 10th	Night	15% 11% 34% 27% 12% 2	780
	11th to 20th	Night	21% 16% 33% 24% 6% 1	800
	21st to end	Night	17% 19% 33% 24% 6% 1	800
December	1st to 10th	Night	24% 15% 33% 22% 5% 1	768
	11th to 20th	Night	24% 16% 34% 22% 4	760
	21st to end	Night	24% 15% 38% 21% 2	836

Page generated at 2024-11-29 10:43:10. Version ac07

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