Deer Path Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Deer Path Park clear sky chart from 2005-11-06 to 2024-11-04.

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% 39%	101321
	Night	17% 7% 2 6% 4 4 4 3 5% 7% 41%	97680
Transparency	Day	42% 6% 12% 22% 16% 2	104853
	Night	42% 5% 11% 23% 16% 2	102237
Seeing	Day	23% 14% 29% 21% 10% 3	14969
	Night	21% 12% 31% 26% 9% 1	24176

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	15% 7% 4 6% 4 4 3 3 4 4 46%	2517
	11th to 20th	Day	14% 10% 4 9% 6% 4 5% 4 5% 6% 34%	2520
	21st to end	Day	21% 10% 4 8% 4 4 4 3 4 5% 34%	3106
February	1st to 10th	Day	17% 8% 2 7% 3 4 4 3 6% 6% 39%	1710
	11th to 20th	Day	16% 7% 3 7% 5% 4 4 3 5% 5% 41%	1815
	21st to end	Day	20% 9% 3 6% 4 4 5% 3 5% 4 38%	1570
March	1st to 10th	Day	27% 8% 2 5% 4 3 3 3 4 4 36%	3116
	11th to 20th	Day	10% 5% 2 6% 6% 5% 5% 4 6% 8% 44%	3434
	21st to end	Day	21% 7% 2 6% 3 3 3 3 4 6% 43%	4070
April	1st to 10th	Day	17% 8% 3 6% 5% 4 4 3 5% 6% 39%	2280
	11th to 20th	Day	16% 8% 2 5% 4 3 5% 3 6% 8% 40%	2254
	21st to end	Day	17% 6% 3 6% 5% 4 4 4 5% 7% 40%	2280
May	1st to 10th	Day	27% 9% 2 6% 4 3 4 4 5% 7% 28%	4113
	11th to 20th	Day	24% 9% 2 7% 5% 5% 4 4 5% 6% 29%	4398
	21st to end	Day	13% 6% 2 5% 4 4 4 4 6% 9% 44%	4837
June	1st to 10th	Day	15% 6% 2 6% 4 5% 6% 5% 7% 8% 38%	2660
	11th to 20th	Day	14% 5% 3 7% 6% 5% 5% 5% 6% 8% 37%	2660
	21st to end	Day	13% 5% 2 7% 5% 4 5% 4 6% 8% 41%	2660
July	1st to 10th	Day	8% 6% 3 7% 6% 6% 6% 5% 7% 9% 37%	4440
	11th to 20th	Day	10% 6% 2 5% 5% 4 6% 5% 6% 11% 40%	4440
	21st to end	Day	14% 8% 3 8% 5% 5% 6% 5% 6% 8% 33%	4814
August	1st to 10th	Day	21% 5% 2 6% 4 5% 5% 4 6% 8% 32%	4099
	11th to 20th	Day	13% 5% 2 5% 4 4 5% 4 5% 9% 43%	3730
	21st to end	Day	13% 5% 2 5% 4 3 5% 4 5% 8% 48%	4180
September	1st to 10th	Day	15% 5% 2 6% 4 4 4 4 5% 7% 44%	2280
	11th to 20th	Day	13% 5% 2 4 3 3 4 3 5% 8% 50%	2233
	21st to end	Day	20% 5% 2 6% 5% 4 4 3 5% 6% 40%	2090
October	1st to 10th	Day	19% 6% 2 6% 3 4 4 3 5% 6% 42%	1929
	11th to 20th	Day	15% 5% 2 5% 4 4 4 3 5% 7% 47%	1900
	21st to end	Day	19% 6% 2 4 3 3 3 3 5% 7% 43%	1988
November	1st to 10th	Day	14% 6% 2 4 4 3 3 2 4 5% 52%	1698
	11th to 20th	Day	17% 6% 1 5% 3 4 3 3 6% 5% 46%	1710
	21st to end	Day	16% 5% 2 5% 4 4 4 4 5% 7% 44%	1592
December	1st to 10th	Day	19% 8% 3 6% 4 4 4 3 5% 8% 36%	1520
	11th to 20th	Day	21% 6% 2 5% 3 4 4 3 4 6% 41%	1906
	21st to end	Day	18% 7% 3 9% 6% 5% 6% 3 6% 7% 31%	2772
January	1st to 10th	Night	16% 7% 2 5% 4 3 3 3 5% 6% 45%	4429
	11th to 20th	Night	16% 9% 3 6% 4 4 4 3 4 6% 40%	4440
	21st to end	Night	25% 10% 2 5% 3 3 3 3 4 5% 36%	4532
February	1st to 10th	Night	16% 8% 3 6% 4 4 4 3 5% 6% 41%	2470
	11th to 20th	Night	17% 8% 3 7% 5% 4 3 3 5% 5% 41%	2249
	21st to end	Night	19% 9% 2 5% 4 4 3 3 5% 6% 42%	1884
March	1st to 10th	Night	23% 9% 2 5% 4 3 4 3 5% 5% 37%	3724
	11th to 20th	Night	11% 6% 2 5% 4 5% 4 4 5% 6% 48%	3521
	21st to end	Night	18% 9% 3 6% 4 3 3 2 4 4 44%	3548
April	1st to 10th	Night	17% 7% 3 6% 4 5% 4 4 6% 7% 37%	1900
	11th to 20th	Night	16% 7% 2 6% 5% 5% 3 3 6% 7% 40%	1875
	21st to end	Night	20% 6% 2 5% 3 3 4 3 5% 7% 44%	1900
May	1st to 10th	Night	26% 9% 3 6% 4 4 4 3 5% 8% 29%	2855
	11th to 20th	Night	25% 10% 3 7% 4 5% 3 3 5% 5% 31%	2495
	21st to end	Night	14% 7% 3 5% 4 4 4 3 7% 9% 40%	2738
June	1st to 10th	Night	16% 6% 2 5% 4 4 4 4 5% 8% 42%	1520
	11th to 20th	Night	13% 5% 2 6% 5% 4 5% 5% 6% 9% 41%	1520
	21st to end	Night	11% 4 2 5% 4 4 6% 4 7% 9% 43%	1520
July	1st to 10th	Night	8% 6% 3 7% 5% 5% 6% 4 7% 9% 38%	2520
	11th to 20th	Night	12% 6% 2 6% 5% 4 5% 5% 8% 10% 37%	2520
	21st to end	Night	16% 7% 2 6% 4 5% 5% 5% 7% 8% 36%	2739
August	1st to 10th	Night	22% 6% 2 6% 4 5% 4 4 7% 8% 31%	2810
	11th to 20th	Night	15% 6% 2 6% 4 5% 5% 4 6% 7% 39%	3084
	21st to end	Night	11% 5% 2 5% 3 4 4 2 6% 8% 50%	3476
September	1st to 10th	Night	15% 6% 3 6% 4 5% 4 4 5% 5% 45%	1900
	11th to 20th	Night	13% 6% 1 4 3 4 4 3 4 7% 51%	1947
	21st to end	Night	19% 6% 2 5% 4 3 4 3 5% 6% 42%	2090
October	1st to 10th	Night	19% 6% 2 6% 3 3 3 3 4 7% 42%	2247
	11th to 20th	Night	15% 5% 2 4 3 3 4 3 4 6% 50%	2280
	21st to end	Night	19% 6% 3 4 3 3 3 3 4 6% 46%	2608
November	1st to 10th	Night	12% 6% 2 5% 3 3 3 3 4 5% 53%	2453
	11th to 20th	Night	18% 7% 2 4 3 2 4 3 4 4 48%	2470
	21st to end	Night	14% 7% 2 5% 3 4 4 3 6% 8% 44%	2584
December	1st to 10th	Night	20% 7% 3 5% 4 4 4 3 5% 6% 39%	2660
	11th to 20th	Night	18% 6% 2 5% 4 4 4 4 6% 7% 41%	3288
	21st to end	Night	19% 9% 3 7% 5% 4 3 3 5% 6% 37%	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	42% 4 11% 28% 14% 3	2518
	11th to 20th	Day	49% 4 12% 19% 13% 2	2520
	21st to end	Day	52% 6% 10% 20% 10% 2	3106
February	1st to 10th	Day	45% 5% 14% 23% 12% 2	1710
	11th to 20th	Day	46% 5% 8% 23% 16% 3	1824
	21st to end	Day	49% 4 11% 21% 12% 3	1570
March	1st to 10th	Day	51% 3 9% 26% 9% 2	3119
	11th to 20th	Day	35% 6% 14% 28% 15% 3	3434
	21st to end	Day	44% 3 8% 16% 23% 5%	4070
April	1st to 10th	Day	46% 5% 10% 19% 16% 5%	2280
	11th to 20th	Day	41% 5% 13% 20% 18% 4	2254
	21st to end	Day	44% 5% 9% 20% 18% 5%	2280
May	1st to 10th	Day	54% 6% 11% 15% 12% 1	4127
	11th to 20th	Day	55% 6% 12% 17% 9% 1	4402
	21st to end	Day	36% 7% 11% 25% 18% 2	4837
June	1st to 10th	Day	41% 8% 14% 21% 15% 1	2660
	11th to 20th	Day	44% 7% 14% 21% 11% 3	2660
	21st to end	Day	40% 8% 12% 22% 16% 1	2660
July	1st to 10th	Day	42% 10% 13% 20% 14% 2	4370
	11th to 20th	Day	37% 8% 16% 23% 14% 2	4365
	21st to end	Day	47% 7% 11% 17% 16% 2	4661
August	1st to 10th	Day	49% 7% 12% 21% 11%	4085
	11th to 20th	Day	37% 7% 13% 28% 14% 1	3766
	21st to end	Day	34% 6% 10% 28% 21% 2	4180
September	1st to 10th	Day	39% 7% 11% 20% 20% 3	2280
	11th to 20th	Day	33% 5% 11% 23% 24% 4	2233
	21st to end	Day	46% 5% 8% 17% 20% 3	2090
October	1st to 10th	Day	39% 4 9% 18% 24% 5%	3202
	11th to 20th	Day	26% 4 10% 25% 29% 5%	3140
	21st to end	Day	27% 3 13% 25% 27% 4	3252
November	1st to 10th	Day	35% 4 12% 24% 22% 3	1698
	11th to 20th	Day	39% 4 11% 22% 21% 3	1710
	21st to end	Day	39% 4 13% 29% 12% 3	1592
December	1st to 10th	Day	46% 4 16% 20% 13% 1	1520
	11th to 20th	Day	45% 5% 13% 25% 11% 2	1906
	21st to end	Day	51% 6% 13% 21% 9% 1	2772
January	1st to 10th	Night	40% 4 10% 31% 12% 3	4429
	11th to 20th	Night	46% 4 12% 24% 11% 2	4440
	21st to end	Night	50% 4 8% 23% 12% 2	4532
February	1st to 10th	Night	44% 5% 13% 25% 12% 2	2470
	11th to 20th	Night	45% 4 10% 19% 18% 4	2251
	21st to end	Night	43% 4 8% 23% 18% 4	1884
March	1st to 10th	Night	50% 5% 8% 23% 12% 3	3734
	11th to 20th	Night	36% 6% 13% 25% 18% 2	3522
	21st to end	Night	44% 4 8% 16% 22% 7%	3548
April	1st to 10th	Night	45% 5% 11% 19% 16% 4	1900
	11th to 20th	Night	44% 5% 10% 19% 20% 2	1875
	21st to end	Night	40% 6% 9% 21% 19% 5%	1900
May	1st to 10th	Night	53% 7% 9% 19% 10% 1	2861
	11th to 20th	Night	53% 7% 14% 14% 10% 2	2496
	21st to end	Night	38% 8% 15% 22% 14% 3	2739
June	1st to 10th	Night	40% 6% 10% 22% 19% 2	1520
	11th to 20th	Night	38% 8% 13% 26% 13% 1	1520
	21st to end	Night	35% 10% 15% 25% 15% 1	1520
July	1st to 10th	Night	40% 9% 17% 18% 14% 2	2480
	11th to 20th	Night	40% 9% 14% 23% 13% 1	2472
	21st to end	Night	45% 7% 13% 16% 16% 2	2651
August	1st to 10th	Night	49% 8% 17% 15% 9% 1	2800
	11th to 20th	Night	42% 8% 12% 25% 13% 1	3114
	21st to end	Night	33% 6% 10% 30% 20% 1	3476
September	1st to 10th	Night	40% 7% 10% 20% 21% 2	1900
	11th to 20th	Night	33% 5% 11% 22% 26% 4	1947
	21st to end	Night	42% 5% 8% 22% 21% 2	2090
October	1st to 10th	Night	41% 4 11% 22% 21% 2	3754
	11th to 20th	Night	25% 5% 9% 29% 29% 4	3779
	21st to end	Night	29% 3 11% 32% 22% 3	4294
November	1st to 10th	Night	33% 5% 12% 24% 22% 4	2453
	11th to 20th	Night	41% 4 8% 23% 19% 5%	2470
	21st to end	Night	38% 5% 13% 28% 15% 2	2584
December	1st to 10th	Night	46% 5% 12% 23% 13% 1	2660
	11th to 20th	Night	42% 5% 14% 19% 16% 4	3288
	21st to end	Night	49% 4 11% 24% 11%	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	29% 22% 32% 14% 2 1	180
	11th to 20th	Day	34% 31% 24% 10% 1	180
	21st to end	Day	25% 26% 31% 13% 4	294
February	1st to 10th	Day	32% 24% 33% 8% 3	270
	11th to 20th	Day	32% 22% 35% 10% 1	423
	21st to end	Day	34% 22% 26% 15% 3	382
March	1st to 10th	Day	31% 20% 29% 16% 3	460
	11th to 20th	Day	27% 26% 30% 13% 2 1	460
	21st to end	Day	29% 23% 30% 11% 5% 1	506
April	1st to 10th	Day	30% 19% 31% 13% 6% 1	460
	11th to 20th	Day	25% 22% 30% 13% 9% 1	452
	21st to end	Day	28% 19% 31% 17% 3 2	460
May	1st to 10th	Day	33% 17% 28% 15% 6% 2	463
	11th to 20th	Day	23% 14% 34% 20% 7% 1	487
	21st to end	Day	20% 9% 27% 26% 16% 2	529
June	1st to 10th	Day	17% 13% 31% 24% 12% 2	490
	11th to 20th	Day	18% 12% 29% 28% 11% 3	490
	21st to end	Day	18% 9% 34% 26% 11% 2	490
July	1st to 10th	Day	12% 7% 25% 31% 19% 6%	485
	11th to 20th	Day	9% 5% 25% 35% 20% 5%	484
	21st to end	Day	16% 5% 32% 30% 13% 4	532
August	1st to 10th	Day	13% 5% 27% 32% 17% 6%	486
	11th to 20th	Day	14% 5% 23% 32% 19% 6%	479
	21st to end	Day	14% 7% 28% 29% 15% 8%	539
September	1st to 10th	Day	18% 9% 25% 26% 15% 7%	490
	11th to 20th	Day	15% 6% 26% 26% 16% 10%	490
	21st to end	Day	23% 12% 27% 22% 12% 5%	490
October	1st to 10th	Day	24% 9% 27% 20% 13% 7%	490
	11th to 20th	Day	18% 16% 29% 24% 10% 2	490
	21st to end	Day	24% 15% 31% 18% 11% 1	484
November	1st to 10th	Day	21% 11% 30% 22% 12% 3	374
	11th to 20th	Day	27% 16% 32% 20% 4 1	370
	21st to end	Day	20% 17% 40% 17% 6%	252
December	1st to 10th	Day	28% 28% 27% 10% 7%	180
	11th to 20th	Day	38% 22% 24% 11% 5%	180
	21st to end	Day	31% 18% 28% 16% 6% 1	198
January	1st to 10th	Night	22% 20% 38% 18% 3	760
	11th to 20th	Night	26% 17% 33% 20% 3	760
	21st to end	Night	21% 19% 39% 20% 1	836
February	1st to 10th	Night	24% 18% 35% 21% 2	760
	11th to 20th	Night	25% 21% 38% 14% 1	743
	21st to end	Night	29% 16% 36% 17% 2	628
March	1st to 10th	Night	24% 21% 32% 20% 4	760
	11th to 20th	Night	25% 19% 34% 19% 3	760
	21st to end	Night	22% 16% 39% 17% 4	836
April	1st to 10th	Night	22% 20% 36% 18% 4	760
	11th to 20th	Night	23% 14% 36% 22% 6%	751
	21st to end	Night	22% 14% 34% 24% 5%	760
May	1st to 10th	Night	26% 14% 31% 23% 6%	591
	11th to 20th	Night	25% 8% 36% 24% 8%	374
	21st to end	Night	17% 7% 24% 38% 12% 1	411
June	1st to 10th	Night	18% 5% 29% 35% 12% 1	380
	11th to 20th	Night	14% 4 30% 41% 11%	380
	21st to end	Night	10% 4 27% 47% 12% 1	380
July	1st to 10th	Night	11% 4 25% 39% 19% 2	370
	11th to 20th	Night	11% 4 27% 39% 19% 1	368
	21st to end	Night	12% 3 24% 45% 15% 1	416
August	1st to 10th	Night	15% 1 17% 44% 20% 2	552
	11th to 20th	Night	15% 3 20% 36% 25% 2	737
	21st to end	Night	16% 3 20% 38% 21% 1	836
September	1st to 10th	Night	17% 4 26% 34% 17% 2	760
	11th to 20th	Night	16% 3 21% 34% 21% 4	760
	21st to end	Night	22% 6% 24% 31% 16% 1	760
October	1st to 10th	Night	22% 9% 26% 26% 16% 2	760
	11th to 20th	Night	18% 11% 29% 30% 11%	760
	21st to end	Night	23% 12% 31% 23% 10%	836
November	1st to 10th	Night	15% 11% 34% 27% 11% 1	755
	11th to 20th	Night	23% 16% 29% 25% 7%	760
	21st to end	Night	18% 16% 35% 23% 6% 1	760
December	1st to 10th	Night	25% 18% 31% 20% 5% 1	760
	11th to 20th	Night	22% 15% 36% 23% 4	760
	21st to end	Night	25% 15% 33% 24% 2	836

Page generated at 2024-11-01 22:47:49. Version ac07

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