Cricket Hill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cricket Hill clear sky chart from 2005-11-06 to 2024-01-12.

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	13% 8% 3 6% 6% 3 5% 5% 5% 8% 37%	74802
	Night	15% 9% 4 6% 5% 3 5% 4 5% 7% 37%	74934
Transparency	Day	44% 8% 13% 21% 12% 2	74503
	Night	46% 7% 13% 20% 12% 2	74754
Seeing	Day	15% 6% 24% 32% 19% 4	14626
	Night	18% 8% 27% 30% 15% 2	24603

By Month

Percentage Cloud Cover SE (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% 11% 5% 8% 7% 4 6% 6% 5% 8% 26%	1517
	11th to 20th	Day	13% 15% 7% 9% 8% 4 7% 7% 5% 7% 18%	1448
	21st to end	Day	14% 16% 7% 10% 7% 3 6% 6% 5% 7% 20%	1602
February	1st to 10th	Day	15% 13% 5% 7% 7% 4 6% 5% 6% 7% 24%	1682
	11th to 20th	Day	15% 10% 4 6% 7% 4 5% 5% 5% 6% 33%	1748
	21st to end	Day	14% 11% 6% 10% 6% 4 6% 5% 5% 5% 30%	1480
March	1st to 10th	Day	14% 11% 4 9% 6% 4 5% 5% 4 6% 31%	1800
	11th to 20th	Day	13% 7% 4 6% 6% 4 5% 5% 6% 8% 38%	1843
	21st to end	Day	19% 10% 4 8% 6% 4 5% 5% 5% 6% 28%	2376
April	1st to 10th	Day	17% 9% 4 7% 6% 4 4 4 5% 8% 33%	2160
	11th to 20th	Day	15% 7% 3 6% 6% 4 6% 5% 5% 7% 36%	2134
	21st to end	Day	18% 7% 4 6% 6% 4 5% 5% 5% 8% 33%	2281
May	1st to 10th	Day	17% 6% 3 6% 5% 3 6% 5% 5% 8% 34%	2340
	11th to 20th	Day	17% 6% 4 6% 5% 3 4 4 5% 8% 38%	2391
	21st to end	Day	11% 5% 3 7% 6% 3 6% 5% 6% 8% 40%	2725
June	1st to 10th	Day	10% 5% 2 5% 5% 3 5% 5% 6% 8% 46%	2520
	11th to 20th	Day	10% 4 2 5% 4 3 5% 5% 6% 9% 46%	2520
	21st to end	Day	10% 5% 2 5% 5% 4 6% 7% 6% 9% 41%	2520
July	1st to 10th	Day	7% 3 2 4 5% 3 5% 6% 6% 10% 50%	2520
	11th to 20th	Day	9% 4 2 4 4 3 4 5% 5% 8% 52%	2520
	21st to end	Day	6% 4 2 5% 5% 4 5% 5% 7% 10% 48%	2743
August	1st to 10th	Day	8% 4 2 4 6% 3 5% 5% 7% 8% 48%	2435
	11th to 20th	Day	9% 3 2 5% 5% 3 5% 4 6% 10% 48%	2171
	21st to end	Day	7% 3 1 4 4 3 4 5% 7% 9% 51%	2376
September	1st to 10th	Day	13% 5% 2 5% 4 3 5% 3 6% 8% 46%	2160
	11th to 20th	Day	12% 4 2 3 4 3 4 3 5% 8% 50%	2027
	21st to end	Day	11% 6% 2 5% 6% 4 5% 6% 6% 8% 41%	1980
October	1st to 10th	Day	14% 7% 3 5% 5% 3 4 4 5% 5% 44%	1962
	11th to 20th	Day	20% 7% 3 7% 5% 3 4 6% 4 6% 35%	1764
	21st to end	Day	20% 10% 3 5% 5% 4 5% 4 5% 6% 33%	1782
November	1st to 10th	Day	13% 8% 3 6% 5% 3 4 3 5% 7% 43%	1672
	11th to 20th	Day	15% 10% 4 8% 7% 4 5% 5% 5% 6% 31%	1710
	21st to end	Day	19% 10% 4 7% 6% 4 6% 3 3 5% 34%	1672
December	1st to 10th	Day	16% 13% 7% 8% 8% 3 5% 5% 4 6% 23%	1520
	11th to 20th	Day	13% 12% 6% 10% 6% 4 5% 5% 6% 7% 26%	1918
	21st to end	Day	20% 20% 7% 11% 7% 4 5% 4 4 5% 15%	2783
January	1st to 10th	Night	15% 12% 6% 8% 7% 3 4 4 5% 6% 29%	2648
	11th to 20th	Night	18% 14% 6% 9% 6% 4 4 5% 5% 6% 23%	2541
	21st to end	Night	15% 14% 7% 9% 7% 4 5% 5% 6% 7% 23%	2754
February	1st to 10th	Night	17% 12% 6% 7% 6% 3 4 4 5% 6% 28%	2277
	11th to 20th	Night	15% 10% 4 7% 5% 3 6% 5% 4 6% 34%	2098
	21st to end	Night	20% 11% 4 7% 5% 3 4 3 4 4 34%	1776
March	1st to 10th	Night	17% 10% 5% 8% 6% 4 4 4 4 6% 32%	2160
	11th to 20th	Night	12% 7% 3 6% 5% 3 5% 5% 5% 7% 42%	2118
	21st to end	Night	20% 10% 4 6% 5% 3 5% 4 5% 7% 31%	1994
April	1st to 10th	Night	17% 7% 3 5% 6% 3 5% 5% 4 7% 38%	1800
	11th to 20th	Night	19% 8% 3 5% 5% 4 5% 4 5% 5% 38%	1775
	21st to end	Night	19% 7% 3 6% 6% 3 4 4 5% 6% 37%	1678
May	1st to 10th	Night	16% 7% 3 7% 7% 3 5% 5% 6% 8% 33%	1620
	11th to 20th	Night	18% 7% 3 4 3 3 4 5% 5% 8% 40%	1501
	21st to end	Night	13% 5% 2 5% 7% 2 5% 4 5% 9% 42%	1551
June	1st to 10th	Night	9% 6% 3 4 5% 3 5% 4 5% 9% 47%	1440
	11th to 20th	Night	11% 7% 2 4 5% 3 4 6% 5% 8% 46%	1440
	21st to end	Night	10% 5% 3 5% 6% 3 5% 5% 7% 9% 42%	1440
July	1st to 10th	Night	6% 3 2 4 5% 4 5% 6% 5% 10% 51%	1440
	11th to 20th	Night	9% 3 2 4 5% 3 4 5% 5% 7% 53%	1440
	21st to end	Night	6% 3 1 5% 5% 3 5% 6% 7% 9% 50%	1575
August	1st to 10th	Night	6% 3 1 4 5% 3 6% 5% 7% 9% 50%	1501
	11th to 20th	Night	7% 4 2 4 5% 3 4 5% 6% 7% 53%	1727
	21st to end	Night	8% 4 2 4 4 3 4 4 6% 7% 54%	1980
September	1st to 10th	Night	12% 5% 2 4 5% 2 4 4 5% 7% 49%	1800
	11th to 20th	Night	12% 4 2 4 4 2 3 4 5% 7% 53%	1914
	21st to end	Night	13% 5% 2 6% 5% 3 4 4 5% 8% 45%	1980
October	1st to 10th	Night	14% 5% 2 6% 5% 3 4 4 5% 6% 47%	1996
	11th to 20th	Night	19% 8% 2 6% 4 3 4 4 3 7% 40%	2194
	21st to end	Night	23% 8% 3 5% 5% 2 4 3 4 8% 34%	2574
November	1st to 10th	Night	13% 7% 3 6% 4 3 4 5% 4 6% 44%	2406
	11th to 20th	Night	15% 10% 3 7% 5% 4 4 5% 5% 7% 33%	2470
	21st to end	Night	18% 9% 4 7% 5% 4 5% 4 5% 5% 34%	2503
December	1st to 10th	Night	18% 13% 4 8% 7% 4 6% 5% 5% 6% 24%	2660
	11th to 20th	Night	15% 14% 5% 8% 6% 3 5% 5% 5% 6% 28%	3279
	21st to end	Night	25% 17% 6% 8% 7% 4 4 4 4 5% 17%	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	55% 9% 14% 14% 8%	1518
	11th to 20th	Day	63% 9% 16% 10% 2	1448
	21st to end	Day	61% 8% 12% 13% 6%	1602
February	1st to 10th	Day	58% 8% 12% 13% 7% 1	1682
	11th to 20th	Day	51% 8% 10% 20% 9% 1	1758
	21st to end	Day	55% 9% 11% 15% 9% 1	1480
March	1st to 10th	Day	54% 7% 13% 19% 7% 1	1800
	11th to 20th	Day	43% 9% 14% 22% 10% 2	1843
	21st to end	Day	56% 8% 12% 17% 5% 1	2376
April	1st to 10th	Day	49% 7% 13% 19% 11%	2160
	11th to 20th	Day	46% 8% 10% 20% 12% 4	2134
	21st to end	Day	48% 8% 14% 16% 12% 2	2281
May	1st to 10th	Day	47% 9% 14% 22% 8%	2340
	11th to 20th	Day	45% 8% 12% 22% 11% 1	2395
	21st to end	Day	41% 9% 13% 20% 15% 2	2725
June	1st to 10th	Day	34% 8% 13% 24% 18% 2	2520
	11th to 20th	Day	34% 8% 12% 23% 20% 3	2520
	21st to end	Day	37% 11% 16% 20% 15% 2	2520
July	1st to 10th	Day	30% 8% 14% 28% 16% 4	2451
	11th to 20th	Day	30% 8% 16% 28% 16% 2	2445
	21st to end	Day	29% 11% 17% 24% 15% 4	2591
August	1st to 10th	Day	32% 9% 17% 29% 12% 2	2420
	11th to 20th	Day	31% 11% 14% 26% 16% 2	2171
	21st to end	Day	27% 8% 17% 26% 18% 3	2376
September	1st to 10th	Day	35% 8% 14% 22% 17% 3	2160
	11th to 20th	Day	31% 7% 13% 30% 17% 2	2027
	21st to end	Day	38% 8% 12% 23% 17% 1	1980
October	1st to 10th	Day	41% 7% 11% 24% 14% 2	1962
	11th to 20th	Day	49% 7% 10% 21% 12% 1	1764
	21st to end	Day	52% 7% 12% 20% 9% 2	1782
November	1st to 10th	Day	40% 6% 15% 21% 16% 2	1672
	11th to 20th	Day	51% 7% 14% 18% 8% 1	1710
	21st to end	Day	54% 7% 11% 21% 8%	1672
December	1st to 10th	Day	58% 11% 13% 13% 6%	1520
	11th to 20th	Day	55% 8% 14% 19% 4	1915
	21st to end	Day	72% 8% 9% 8% 2	2783
January	1st to 10th	Night	54% 7% 13% 18% 7% 1	2648
	11th to 20th	Night	61% 8% 16% 12% 4	2541
	21st to end	Night	60% 7% 14% 13% 6%	2754
February	1st to 10th	Night	58% 5% 12% 16% 9% 1	2277
	11th to 20th	Night	50% 6% 13% 20% 10% 1	2099
	21st to end	Night	54% 5% 12% 17% 10% 3	1776
March	1st to 10th	Night	54% 6% 11% 20% 8% 1	2160
	11th to 20th	Night	41% 7% 14% 21% 15% 2	2118
	21st to end	Night	53% 7% 11% 19% 8% 1	1994
April	1st to 10th	Night	45% 7% 12% 22% 13% 1	1800
	11th to 20th	Night	47% 6% 8% 19% 17% 4	1775
	21st to end	Night	47% 7% 10% 21% 13% 3	1678
May	1st to 10th	Night	49% 7% 10% 21% 12%	1620
	11th to 20th	Night	43% 7% 12% 22% 15% 2	1502
	21st to end	Night	39% 7% 13% 21% 16% 2	1552
June	1st to 10th	Night	33% 7% 13% 25% 20% 3	1440
	11th to 20th	Night	34% 6% 13% 24% 21% 2	1440
	21st to end	Night	36% 9% 16% 21% 16% 2	1440
July	1st to 10th	Night	29% 9% 15% 26% 16% 5%	1400
	11th to 20th	Night	28% 8% 14% 26% 20% 3	1392
	21st to end	Night	26% 9% 17% 25% 18% 4	1487
August	1st to 10th	Night	28% 8% 17% 28% 16% 2	1492
	11th to 20th	Night	28% 8% 17% 27% 19% 2	1727
	21st to end	Night	28% 7% 12% 28% 20% 5%	1980
September	1st to 10th	Night	33% 7% 13% 24% 20% 3	1800
	11th to 20th	Night	31% 6% 9% 28% 24% 2	1914
	21st to end	Night	37% 6% 11% 27% 16% 2	1980
October	1st to 10th	Night	37% 6% 10% 27% 18% 2	1996
	11th to 20th	Night	44% 6% 10% 22% 16% 2	2194
	21st to end	Night	50% 6% 12% 21% 10% 1	2574
November	1st to 10th	Night	40% 6% 11% 24% 16% 3	2406
	11th to 20th	Night	49% 7% 13% 20% 9% 1	2470
	21st to end	Night	51% 7% 13% 21% 8%	2503
December	1st to 10th	Night	56% 11% 12% 13% 6% 1	2660
	11th to 20th	Night	55% 7% 15% 17% 5%	3281
	21st to end	Night	69% 7% 10% 10% 3	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	21% 10% 33% 29% 7% 1	270
	11th to 20th	Day	23% 9% 34% 28% 6%	243
	21st to end	Day	20% 11% 34% 30% 6%	264
February	1st to 10th	Day	21% 10% 40% 25% 4 1	240
	11th to 20th	Day	20% 15% 36% 25% 4	240
	21st to end	Day	17% 9% 46% 25% 4	198
March	1st to 10th	Day	15% 12% 37% 32% 5%	240
	11th to 20th	Day	19% 9% 35% 30% 8%	281
	21st to end	Day	24% 9% 32% 24% 10% 1	462
April	1st to 10th	Day	20% 9% 31% 31% 9%	420
	11th to 20th	Day	16% 10% 32% 27% 12% 3	412
	21st to end	Day	20% 7% 30% 28% 13% 2	420
May	1st to 10th	Day	21% 4 29% 32% 12% 2	423
	11th to 20th	Day	20% 2 24% 36% 17% 1	537
	21st to end	Day	14% 4 18% 34% 25% 6%	679
June	1st to 10th	Day	10% 2 18% 39% 26% 5%	630
	11th to 20th	Day	12% 1 20% 38% 25% 4	630
	21st to end	Day	10% 4 18% 41% 23% 4	630
July	1st to 10th	Day	7% 3 12% 34% 30% 14%	621
	11th to 20th	Day	11% 2 13% 40% 27% 7%	618
	21st to end	Day	6% 1 14% 43% 31% 4	684
August	1st to 10th	Day	7% 2 10% 36% 35% 9%	554
	11th to 20th	Day	8% 4 13% 37% 29% 9%	439
	21st to end	Day	7% 3 11% 36% 34% 9%	495
September	1st to 10th	Day	14% 4 17% 31% 29% 5%	450
	11th to 20th	Day	10% 3 12% 34% 31% 10%	450
	21st to end	Day	13% 7% 23% 26% 25% 7%	450
October	1st to 10th	Day	18% 3 24% 31% 19% 6%	432
	11th to 20th	Day	19% 16% 27% 27% 11%	270
	21st to end	Day	27% 12% 27% 29% 5%	297
November	1st to 10th	Day	13% 10% 27% 33% 16% 1	270
	11th to 20th	Day	20% 15% 33% 22% 9% 1	270
	21st to end	Day	27% 8% 31% 30% 4	270
December	1st to 10th	Day	15% 16% 37% 27% 5%	270
	11th to 20th	Day	15% 14% 41% 23% 7%	270
	21st to end	Day	20% 16% 40% 21% 2	297
January	1st to 10th	Night	19% 14% 39% 23% 5%	950
	11th to 20th	Night	22% 14% 34% 25% 5% 1	908
	21st to end	Night	21% 11% 35% 27% 5%	990
February	1st to 10th	Night	23% 9% 38% 24% 5%	837
	11th to 20th	Night	19% 11% 37% 28% 5%	703
	21st to end	Night	25% 10% 38% 23% 4	592
March	1st to 10th	Night	21% 7% 36% 26% 10%	720
	11th to 20th	Night	16% 7% 31% 36% 9% 1	720
	21st to end	Night	23% 6% 29% 29% 12% 1	608
April	1st to 10th	Night	19% 8% 31% 32% 8% 1	540
	11th to 20th	Night	22% 7% 26% 29% 15% 1	533
	21st to end	Night	21% 6% 25% 32% 14% 1	540
May	1st to 10th	Night	19% 4 23% 40% 13% 1	540
	11th to 20th	Night	20% 2 19% 35% 23% 2	531
	21st to end	Night	14% 2 14% 37% 29% 4	584
June	1st to 10th	Night	11% 1 13% 42% 30% 2	540
	11th to 20th	Night	13% 3 16% 40% 25% 3	540
	21st to end	Night	10% 2 17% 38% 30% 3	540
July	1st to 10th	Night	8% 2 7% 37% 36% 10%	525
	11th to 20th	Night	9% 3 10% 38% 33% 7%	522
	21st to end	Night	6% 1 12% 44% 34% 3	591
August	1st to 10th	Night	7% 1 9% 43% 33% 8%	537
	11th to 20th	Night	8% 3 10% 37% 33% 10%	534
	21st to end	Night	9% 2 14% 33% 36% 6%	594
September	1st to 10th	Night	12% 2 17% 33% 29% 6%	540
	11th to 20th	Night	13% 4 13% 34% 29% 8%	654
	21st to end	Night	13% 6% 21% 29% 23% 7%	720
October	1st to 10th	Night	16% 5% 18% 35% 21% 4	720
	11th to 20th	Night	22% 11% 30% 27% 10% 1	720
	21st to end	Night	27% 11% 28% 25% 8%	792
November	1st to 10th	Night	17% 9% 36% 23% 13% 1	740
	11th to 20th	Night	19% 17% 32% 26% 5% 1	760
	21st to end	Night	21% 13% 35% 25% 6%	793
December	1st to 10th	Night	23% 15% 37% 21% 5%	950
	11th to 20th	Night	21% 13% 37% 25% 4	950
	21st to end	Night	29% 14% 35% 19% 2	1045

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