Moose Pond
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moose Pond clear sky chart from 2005-11-06 to 2024-06-17.

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	17% 8% 2 6% 5% 4 4 4 5% 7% 37%	89158
	Night	18% 8% 3 6% 4 4 4 4 5% 6% 37%	89719
Transparency	Day	45% 7% 12% 21% 13% 2	88877
	Night	45% 7% 12% 21% 13% 2	89554
Seeing	Day	22% 14% 29% 22% 10% 3	14368
	Night	21% 9% 30% 30% 9% 1	23274

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	14% 9% 3 6% 4 4 5% 4 6% 7% 39%	2517
	11th to 20th	Day	15% 8% 3 7% 6% 5% 5% 4 5% 7% 36%	2520
	21st to end	Day	15% 12% 2 6% 4 4 4 4 5% 6% 37%	2772
February	1st to 10th	Day	14% 10% 4 6% 4 5% 5% 4 5% 6% 37%	1668
	11th to 20th	Day	11% 9% 3 8% 6% 4 4 4 7% 6% 38%	1848
	21st to end	Day	15% 10% 3 7% 4 5% 6% 4 5% 5% 36%	1570
March	1st to 10th	Day	23% 13% 3 7% 5% 4 4 3 4 4 29%	3116
	11th to 20th	Day	15% 8% 3 7% 5% 4 4 3 5% 7% 39%	3370
	21st to end	Day	22% 8% 3 6% 4 4 3 3 4 7% 35%	3991
April	1st to 10th	Day	19% 11% 3 6% 4 4 4 2 5% 6% 36%	2280
	11th to 20th	Day	18% 6% 3 6% 5% 5% 5% 4 6% 7% 38%	2319
	21st to end	Day	22% 8% 3 7% 4 4 4 3 4 5% 34%	2470
May	1st to 10th	Day	23% 9% 3 8% 4 5% 5% 4 5% 6% 27%	4106
	11th to 20th	Day	18% 8% 3 8% 6% 6% 5% 4 5% 7% 31%	4229
	21st to end	Day	15% 6% 2 6% 4 5% 5% 4 7% 9% 38%	4837
June	1st to 10th	Day	22% 7% 3 6% 5% 5% 4 5% 5% 7% 32%	2660
	11th to 20th	Day	17% 6% 3 5% 4 4 4 4 6% 7% 39%	2607
	21st to end	Day	20% 7% 2 7% 5% 5% 5% 5% 5% 7% 31%	2520
July	1st to 10th	Day	15% 6% 2 5% 5% 5% 5% 4 6% 8% 38%	2520
	11th to 20th	Day	12% 7% 2 7% 6% 5% 5% 5% 7% 8% 36%	2520
	21st to end	Day	14% 6% 2 5% 5% 4 6% 5% 7% 9% 37%	2744
August	1st to 10th	Day	12% 5% 2 6% 6% 5% 5% 5% 7% 8% 38%	2385
	11th to 20th	Day	14% 5% 2 7% 5% 6% 5% 5% 6% 8% 38%	2304
	21st to end	Day	11% 4 2 5% 5% 4 5% 3 6% 8% 47%	2429
September	1st to 10th	Day	12% 4 2 5% 4 3 4 4 6% 8% 47%	2146
	11th to 20th	Day	14% 4 2 5% 3 3 3 3 4 6% 53%	1980
	21st to end	Day	16% 5% 1 4 4 4 3 4 5% 7% 46%	1980
October	1st to 10th	Day	21% 7% 2 5% 4 4 3 3 5% 6% 39%	1980
	11th to 20th	Day	17% 7% 2 6% 3 3 4 3 4 8% 42%	1721
	21st to end	Day	25% 8% 3 6% 4 4 3 4 4 5% 35%	1782
November	1st to 10th	Day	16% 6% 2 6% 3 3 3 4 5% 7% 45%	1671
	11th to 20th	Day	20% 4 1 5% 3 3 5% 4 6% 6% 41%	1710
	21st to end	Day	21% 8% 2 5% 3 4 3 4 5% 6% 40%	1688
December	1st to 10th	Day	21% 10% 3 7% 5% 4 4 4 5% 7% 32%	1520
	11th to 20th	Day	21% 9% 2 6% 3 3 3 3 4 5% 39%	1906
	21st to end	Day	24% 12% 3 5% 4 5% 5% 4 6% 5% 30%	2772
January	1st to 10th	Night	16% 9% 3 6% 3 4 4 4 7% 7% 37%	4429
	11th to 20th	Night	12% 8% 3 10% 6% 6% 7% 5% 7% 7% 29%	4440
	21st to end	Night	18% 11% 3 9% 6% 5% 4 3 5% 6% 30%	4884
February	1st to 10th	Night	13% 10% 3 7% 5% 4 5% 5% 6% 6% 36%	2507
	11th to 20th	Night	10% 10% 3 6% 5% 5% 5% 4 6% 5% 41%	2218
	21st to end	Night	13% 10% 3 6% 5% 4 4 3 5% 6% 39%	1884
March	1st to 10th	Night	27% 10% 3 5% 4 4 3 3 4 5% 32%	3724
	11th to 20th	Night	13% 9% 4 9% 6% 6% 5% 4 5% 7% 32%	3589
	21st to end	Night	24% 9% 3 6% 4 4 4 3 5% 7% 32%	3639
April	1st to 10th	Night	19% 10% 3 7% 4 4 4 3 4 6% 37%	1900
	11th to 20th	Night	18% 8% 3 7% 5% 4 4 4 5% 7% 37%	1808
	21st to end	Night	23% 8% 2 5% 4 3 4 4 5% 5% 37%	1710
May	1st to 10th	Night	22% 10% 3 7% 5% 4 5% 4 6% 6% 27%	2834
	11th to 20th	Night	18% 9% 3 9% 5% 6% 5% 5% 6% 8% 27%	2691
	21st to end	Night	15% 6% 2 7% 4 4 4 3 6% 8% 41%	2738
June	1st to 10th	Night	22% 8% 2 5% 5% 4 5% 3 6% 6% 35%	1520
	11th to 20th	Night	18% 6% 2 5% 4 5% 4 3 6% 8% 39%	1496
	21st to end	Night	19% 6% 2 6% 5% 4 4 3 7% 7% 38%	1440
July	1st to 10th	Night	15% 4 2 4 6% 4 4 4 8% 8% 41%	1440
	11th to 20th	Night	14% 4 2 7% 5% 3 4 3 6% 9% 42%	1440
	21st to end	Night	13% 4 2 4 5% 4 5% 4 8% 9% 43%	1574
August	1st to 10th	Night	14% 5% 3 5% 4 4 4 3 5% 9% 43%	1535
	11th to 20th	Night	14% 5% 2 7% 4 4 4 4 7% 9% 39%	1596
	21st to end	Night	14% 6% 2 5% 4 4 3 3 6% 8% 46%	1925
September	1st to 10th	Night	13% 5% 1 4 3 4 4 3 6% 7% 51%	1813
	11th to 20th	Night	15% 5% 2 4 3 3 3 3 4 5% 52%	1980
	21st to end	Night	14% 6% 2 5% 3 3 5% 3 5% 7% 47%	1980
October	1st to 10th	Night	20% 5% 2 7% 4 4 4 4 6% 6% 38%	1980
	11th to 20th	Night	17% 6% 2 5% 5% 4 4 4 6% 7% 39%	2233
	21st to end	Night	25% 8% 2 6% 3 4 4 4 5% 5% 35%	2574
November	1st to 10th	Night	15% 7% 2 6% 3 4 4 4 5% 5% 43%	2407
	11th to 20th	Night	17% 8% 2 6% 3 5% 5% 3 5% 6% 41%	2470
	21st to end	Night	16% 9% 3 6% 3 4 4 3 4 6% 41%	2489
December	1st to 10th	Night	19% 10% 3 7% 4 4 4 4 6% 5% 33%	2660
	11th to 20th	Night	21% 8% 2 5% 4 4 3 4 5% 6% 37%	3288
	21st to end	Night	22% 10% 3 7% 4 4 4 3 4 5% 33%	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	41% 7% 12% 27% 12% 1	2518
	11th to 20th	Day	44% 8% 13% 23% 10% 2	2520
	21st to end	Day	47% 6% 12% 23% 11% 1	2772
February	1st to 10th	Day	46% 6% 12% 20% 12% 3	1668
	11th to 20th	Day	45% 5% 12% 20% 14% 4	1857
	21st to end	Day	49% 6% 10% 18% 13% 4	1570
March	1st to 10th	Day	59% 5% 8% 11% 13% 3	3119
	11th to 20th	Day	42% 8% 12% 18% 14% 5%	3370
	21st to end	Day	49% 5% 7% 15% 19% 6%	3991
April	1st to 10th	Day	49% 5% 9% 19% 15% 4	2280
	11th to 20th	Day	43% 8% 11% 21% 14% 3	2319
	21st to end	Day	52% 5% 9% 16% 14% 4	2470
May	1st to 10th	Day	55% 9% 10% 16% 9% 1	4120
	11th to 20th	Day	50% 9% 13% 16% 9% 2	4233
	21st to end	Day	38% 9% 15% 21% 15% 1	4837
June	1st to 10th	Day	50% 7% 12% 21% 9% 1	2660
	11th to 20th	Day	42% 8% 12% 20% 16% 3	2607
	21st to end	Day	51% 9% 12% 17% 10% 1	2520
July	1st to 10th	Day	41% 8% 12% 24% 14% 1	2450
	11th to 20th	Day	42% 9% 15% 24% 9% 1	2445
	21st to end	Day	39% 9% 16% 24% 12% 1	2591
August	1st to 10th	Day	40% 10% 15% 25% 10%	2371
	11th to 20th	Day	41% 9% 15% 24% 11% 1	2304
	21st to end	Day	34% 8% 14% 24% 19% 2	2429
September	1st to 10th	Day	33% 8% 14% 27% 17% 1	2146
	11th to 20th	Day	32% 5% 9% 30% 21% 3	1980
	21st to end	Day	36% 6% 13% 26% 18% 1	1980
October	1st to 10th	Day	45% 7% 10% 21% 15% 2	1980
	11th to 20th	Day	41% 6% 11% 29% 11% 1	1721
	21st to end	Day	51% 6% 10% 19% 12% 2	1782
November	1st to 10th	Day	37% 5% 16% 24% 15% 2	1671
	11th to 20th	Day	40% 6% 12% 20% 18% 3	1710
	21st to end	Day	44% 6% 16% 21% 12% 1	1688
December	1st to 10th	Day	51% 6% 13% 19% 10% 1	1520
	11th to 20th	Day	46% 5% 10% 19% 17% 2	1906
	21st to end	Day	54% 7% 10% 18% 9% 2	2772
January	1st to 10th	Night	41% 7% 14% 25% 10% 3	4429
	11th to 20th	Night	45% 9% 15% 18% 10% 2	4440
	21st to end	Night	52% 8% 9% 19% 11% 2	4884
February	1st to 10th	Night	47% 6% 13% 18% 13% 3	2507
	11th to 20th	Night	44% 6% 10% 21% 16% 3	2220
	21st to end	Night	44% 6% 12% 20% 14% 5%	1884
March	1st to 10th	Night	55% 4 10% 17% 11% 3	3734
	11th to 20th	Night	45% 11% 11% 18% 12% 3	3590
	21st to end	Night	51% 5% 7% 15% 17% 5%	3639
April	1st to 10th	Night	49% 5% 9% 19% 15% 3	1900
	11th to 20th	Night	46% 6% 9% 21% 17% 1	1808
	21st to end	Night	48% 7% 11% 17% 14% 4	1710
May	1st to 10th	Night	54% 10% 10% 17% 8% 1	2840
	11th to 20th	Night	50% 11% 13% 16% 7% 2	2692
	21st to end	Night	40% 7% 19% 19% 13% 2	2739
June	1st to 10th	Night	49% 7% 13% 19% 12% 1	1520
	11th to 20th	Night	44% 7% 14% 20% 14% 2	1496
	21st to end	Night	45% 8% 15% 21% 10% 1	1440
July	1st to 10th	Night	38% 10% 16% 22% 13% 1	1400
	11th to 20th	Night	38% 8% 18% 24% 12%	1392
	21st to end	Night	35% 8% 19% 26% 11% 1	1486
August	1st to 10th	Night	38% 8% 16% 26% 11% 1	1525
	11th to 20th	Night	39% 9% 15% 23% 13%	1596
	21st to end	Night	36% 8% 13% 25% 17% 1	1925
September	1st to 10th	Night	33% 7% 14% 30% 16% 1	1813
	11th to 20th	Night	34% 5% 11% 29% 19% 2	1980
	21st to end	Night	36% 6% 12% 29% 15% 2	1980
October	1st to 10th	Night	45% 6% 12% 21% 14% 2	1980
	11th to 20th	Night	42% 7% 14% 26% 10% 1	2233
	21st to end	Night	50% 6% 10% 20% 12% 2	2574
November	1st to 10th	Night	40% 6% 11% 26% 15% 2	2407
	11th to 20th	Night	42% 6% 11% 22% 15% 3	2470
	21st to end	Night	43% 5% 15% 23% 13% 1	2489
December	1st to 10th	Night	51% 6% 11% 22% 10% 1	2660
	11th to 20th	Night	46% 6% 11% 18% 17% 1	3288
	21st to end	Night	53% 6% 10% 20% 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	25% 20% 23% 23% 9%	180
	11th to 20th	Day	23% 22% 26% 23% 4 2	180
	21st to end	Day	20% 16% 33% 24% 8%	198
February	1st to 10th	Day	28% 17% 33% 19% 4	308
	11th to 20th	Day	21% 21% 36% 18% 4	456
	21st to end	Day	24% 16% 31% 24% 5%	382
March	1st to 10th	Day	26% 15% 33% 21% 5%	460
	11th to 20th	Day	25% 19% 32% 17% 6% 1	460
	21st to end	Day	27% 18% 31% 14% 8% 3	506
April	1st to 10th	Day	28% 20% 26% 17% 7% 2	460
	11th to 20th	Day	26% 20% 29% 15% 7% 3	452
	21st to end	Day	29% 19% 29% 15% 6% 2	460
May	1st to 10th	Day	31% 16% 26% 20% 5% 2	463
	11th to 20th	Day	20% 17% 34% 16% 9% 2	487
	21st to end	Day	19% 15% 31% 23% 10% 2	529
June	1st to 10th	Day	20% 13% 34% 22% 9% 1	490
	11th to 20th	Day	17% 16% 28% 26% 11% 2	475
	21st to end	Day	21% 9% 34% 22% 12% 2	450
July	1st to 10th	Day	18% 8% 29% 27% 13% 4	445
	11th to 20th	Day	15% 6% 32% 30% 13% 4	444
	21st to end	Day	15% 5% 31% 30% 15% 4	488
August	1st to 10th	Day	13% 8% 26% 29% 20% 5%	446
	11th to 20th	Day	15% 7% 25% 31% 14% 8%	439
	21st to end	Day	12% 10% 25% 31% 16% 7%	495
September	1st to 10th	Day	14% 8% 27% 25% 19% 7%	450
	11th to 20th	Day	16% 14% 25% 21% 14% 10%	450
	21st to end	Day	16% 11% 28% 25% 13% 7%	450
October	1st to 10th	Day	24% 12% 21% 23% 14% 5%	450
	11th to 20th	Day	20% 13% 27% 22% 16% 2	378
	21st to end	Day	32% 12% 25% 22% 8% 1	396
November	1st to 10th	Day	21% 16% 27% 24% 10% 2	365
	11th to 20th	Day	27% 15% 27% 22% 8% 1	370
	21st to end	Day	28% 16% 25% 24% 7% 1	348
December	1st to 10th	Day	24% 21% 26% 19% 10%	180
	11th to 20th	Day	27% 17% 35% 17% 4	180
	21st to end	Day	29% 20% 27% 18% 5% 1	198
January	1st to 10th	Night	21% 10% 37% 27% 4	760
	11th to 20th	Night	25% 13% 31% 28% 4	760
	21st to end	Night	18% 13% 37% 28% 4	836
February	1st to 10th	Night	21% 10% 37% 28% 3	760
	11th to 20th	Night	17% 12% 43% 25% 3	743
	21st to end	Night	20% 12% 34% 29% 5%	628
March	1st to 10th	Night	23% 13% 36% 26% 3	760
	11th to 20th	Night	21% 14% 33% 26% 7%	760
	21st to end	Night	24% 13% 32% 25% 6% 1	836
April	1st to 10th	Night	26% 11% 31% 28% 4	760
	11th to 20th	Night	21% 13% 34% 27% 6%	684
	21st to end	Night	25% 14% 30% 26% 5%	570
May	1st to 10th	Night	24% 11% 27% 31% 6% 1	570
	11th to 20th	Night	21% 10% 29% 33% 8% 1	492
	21st to end	Night	20% 6% 24% 38% 11% 1	411
June	1st to 10th	Night	23% 6% 26% 35% 10% 1	380
	11th to 20th	Night	19% 5% 24% 37% 14% 1	374
	21st to end	Night	21% 2 21% 43% 14%	360
July	1st to 10th	Night	14% 3 21% 44% 19%	350
	11th to 20th	Night	16% 2 18% 43% 21% 1	348
	21st to end	Night	16% 2 15% 48% 18% 1	394
August	1st to 10th	Night	15% 2 18% 46% 19% 1	461
	11th to 20th	Night	15% 3 25% 37% 18% 2	532
	21st to end	Night	16% 4 19% 39% 19% 3	737
September	1st to 10th	Night	15% 3 26% 36% 19% 2	720
	11th to 20th	Night	18% 6% 24% 28% 19% 4	720
	21st to end	Night	16% 7% 27% 30% 18% 2	720
October	1st to 10th	Night	22% 8% 21% 33% 15% 2	720
	11th to 20th	Night	21% 9% 29% 28% 12% 1	720
	21st to end	Night	29% 9% 28% 28% 6%	792
November	1st to 10th	Night	20% 10% 30% 30% 8% 1	740
	11th to 20th	Night	22% 12% 31% 27% 8% 1	760
	21st to end	Night	21% 15% 30% 28% 6% 1	760
December	1st to 10th	Night	26% 7% 38% 24% 5% 1	760
	11th to 20th	Night	24% 12% 33% 28% 4	760
	21st to end	Night	26% 11% 33% 26% 3	836

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