Mikes Mobile Notary Service, Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mikes Mobile Notary Service, Observatory clear sky chart from 2005-11-06 to 2024-07-05.

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% 6% 2 6% 4 4 4 4 5% 7% 45%	89791
	Night	14% 6% 2 5% 3 3 3 3 5% 7% 50%	89506
Transparency	Day	38% 4 10% 21% 19% 8%	89566
	Night	35% 4 10% 21% 20% 10%	89336
Seeing	Day	14% 5% 19% 28% 25% 9%	14417
	Night	16% 5% 25% 36% 17% 2	24361

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% 8% 2 5% 3 3 3 3 5% 6% 48%	2847
	11th to 20th	Day	18% 4 1 4 2 2 2 2 4 6% 55%	2850
	21st to end	Day	20% 9% 3 6% 3 3 2 2 3 7% 42%	3235
February	1st to 10th	Day	20% 8% 3 6% 3 3 3 3 3 5% 44%	1900
	11th to 20th	Day	19% 8% 3 4 3 3 4 2 4 6% 44%	1849
	21st to end	Day	18% 7% 2 5% 3 3 3 3 3 5% 48%	1588
March	1st to 10th	Day	15% 8% 3 7% 5% 4 4 3 5% 6% 40%	3436
	11th to 20th	Day	20% 9% 3 8% 5% 5% 5% 3 5% 5% 32%	3480
	21st to end	Day	15% 8% 2 6% 4 4 3 3 5% 7% 44%	3814
April	1st to 10th	Day	15% 9% 3 6% 4 4 4 3 5% 7% 41%	2090
	11th to 20th	Day	15% 8% 3 8% 5% 4 3 3 5% 5% 42%	2080
	21st to end	Day	14% 6% 2 6% 5% 3 3 3 5% 7% 45%	2392
May	1st to 10th	Day	21% 9% 3 8% 4 4 4 4 6% 6% 31%	4082
	11th to 20th	Day	15% 6% 2 7% 4 5% 4 4 5% 7% 42%	4082
	21st to end	Day	10% 6% 2 7% 5% 5% 6% 5% 8% 9% 35%	4477
June	1st to 10th	Day	6% 4 2 6% 5% 4 6% 4 7% 9% 49%	2470
	11th to 20th	Day	7% 4 1 4 4 4 5% 5% 6% 9% 49%	2470
	21st to end	Day	5% 5% 2 7% 5% 7% 7% 5% 7% 9% 41%	2470
July	1st to 10th	Day	8% 5% 2 6% 6% 5% 6% 5% 7% 10% 39%	2393
	11th to 20th	Day	4 4 2 4 4 6% 5% 4 7% 11% 49%	2340
	21st to end	Day	4 4 1 4 5% 4 5% 5% 6% 12% 51%	2546
August	1st to 10th	Day	2 2 1 3 3 4 3 4 6% 9% 63%	2328
	11th to 20th	Day	6% 3 2 4 4 4 4 3 7% 10% 52%	2220
	21st to end	Day	5% 3 2 6% 5% 6% 6% 5% 8% 10% 45%	2239
September	1st to 10th	Day	7% 6% 2 7% 5% 5% 5% 4 6% 7% 45%	1980
	11th to 20th	Day	11% 6% 2 6% 5% 5% 5% 5% 7% 7% 42%	1980
	21st to end	Day	7% 4 2 4 4 5% 6% 5% 7% 7% 49%	1980
October	1st to 10th	Day	7% 4 2 4 4 3 4 3 5% 7% 58%	1980
	11th to 20th	Day	13% 5% 2 5% 3 3 4 2 4 5% 53%	1810
	21st to end	Day	12% 5% 1 4 3 3 3 2 3 5% 58%	1980
November	1st to 10th	Day	13% 7% 2 7% 3 4 2 3 5% 6% 48%	1858
	11th to 20th	Day	11% 6% 2 4 4 4 3 3 5% 5% 52%	1829
	21st to end	Day	17% 7% 2 5% 4 4 3 2 4 6% 45%	1710
December	1st to 10th	Day	15% 7% 2 5% 3 4 4 3 3 6% 47%	1710
	11th to 20th	Day	18% 7% 3 6% 4 3 4 3 4 4 44%	2161
	21st to end	Day	16% 7% 2 4 3 2 3 2 4 4 52%	3135
January	1st to 10th	Night	19% 7% 2 3 2 2 2 2 3 5% 53%	4108
	11th to 20th	Night	15% 4 1 3 2 1 2 2 2 4 63%	4120
	21st to end	Night	21% 6% 2 6% 4 3 3 3 4 5% 43%	4462
February	1st to 10th	Night	19% 7% 2 5% 3 3 3 2 3 5% 47%	2280
	11th to 20th	Night	20% 6% 2 5% 2 3 3 2 3 5% 48%	2218
	21st to end	Night	19% 8% 2 5% 3 2 3 3 4 5% 46%	1865
March	1st to 10th	Night	18% 8% 2 6% 4 5% 4 3 5% 6% 39%	3419
	11th to 20th	Night	21% 10% 3 8% 4 4 4 3 5% 5% 33%	3480
	21st to end	Night	14% 7% 3 8% 4 4 4 3 5% 5% 43%	3817
April	1st to 10th	Night	13% 6% 2 5% 4 4 4 4 5% 7% 46%	2090
	11th to 20th	Night	17% 7% 2 5% 4 3 4 3 5% 7% 44%	2046
	21st to end	Night	16% 6% 2 5% 4 3 3 2 5% 6% 48%	1782
May	1st to 10th	Night	23% 8% 3 6% 4 4 3 3 6% 6% 35%	2823
	11th to 20th	Night	11% 6% 2 6% 4 3 4 4 4 7% 48%	2823
	21st to end	Night	12% 6% 2 6% 3 4 5% 4 6% 9% 43%	3090
June	1st to 10th	Night	4 3 1 3 3 3 3 3 7% 10% 60%	1710
	11th to 20th	Night	5% 3 1 4 4 3 4 4 6% 9% 58%	1710
	21st to end	Night	5% 4 1 4 4 4 6% 4 7% 10% 52%	1710
July	1st to 10th	Night	6% 4 1 5% 5% 4 5% 4 7% 9% 51%	1661
	11th to 20th	Night	3 2 1 2 4 3 4 4 7% 10% 61%	1620
	21st to end	Night	4 2 1 3 3 4 4 4 6% 13% 58%	1772
August	1st to 10th	Night	1 1 2 2 2 3 4 6% 10% 69%	1611
	11th to 20th	Night	5% 3 2 5% 4 4 5% 3 7% 10% 52%	1676
	21st to end	Night	4 3 1 4 4 4 5% 5% 7% 12% 50%	2114
September	1st to 10th	Night	7% 4 2 5% 4 4 4 4 6% 8% 52%	1980
	11th to 20th	Night	10% 6% 2 6% 4 5% 4 4 5% 8% 47%	1980
	21st to end	Night	8% 4 1 4 3 5% 4 3 6% 9% 54%	1980
October	1st to 10th	Night	5% 3 1 3 3 4 4 3 4 6% 64%	1980
	11th to 20th	Night	12% 5% 2 4 3 3 3 3 4 6% 55%	2129
	21st to end	Night	15% 3 1 4 2 2 3 2 4 4 60%	2376
November	1st to 10th	Night	12% 6% 2 4 3 3 3 3 4 6% 54%	2220
	11th to 20th	Night	11% 6% 2 5% 4 3 3 3 4 6% 54%	2346
	21st to end	Night	19% 6% 2 5% 3 3 4 3 3 6% 47%	2470
December	1st to 10th	Night	15% 7% 2 5% 3 3 4 3 4 6% 49%	2470
	11th to 20th	Night	17% 8% 2 6% 3 3 3 3 4 5% 46%	3036
	21st to end	Night	18% 6% 2 4 3 2 2 2 2 5% 53%	4532

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	38% 3 5% 19% 23% 13%	2848
	11th to 20th	Day	33% 3 6% 19% 29% 11%	2850
	21st to end	Day	46% 2 4 11% 26% 11%	3235
February	1st to 10th	Day	44% 4 6% 13% 20% 13%	1900
	11th to 20th	Day	43% 3 6% 17% 19% 11%	1859
	21st to end	Day	42% 2 6% 19% 17% 14%	1588
March	1st to 10th	Day	45% 4 6% 16% 20% 9%	3436
	11th to 20th	Day	54% 4 8% 10% 15% 8%	3480
	21st to end	Day	41% 3 9% 17% 23% 7%	3814
April	1st to 10th	Day	44% 4 8% 17% 15% 12%	2090
	11th to 20th	Day	45% 3 7% 15% 19% 11%	2080
	21st to end	Day	40% 4 6% 21% 21% 8%	2392
May	1st to 10th	Day	52% 5% 11% 15% 13% 5%	4120
	11th to 20th	Day	41% 4 10% 19% 21% 5%	4086
	21st to end	Day	40% 7% 12% 29% 11% 1	4489
June	1st to 10th	Day	29% 5% 15% 28% 20% 4	2470
	11th to 20th	Day	30% 5% 12% 29% 19% 6%	2470
	21st to end	Day	36% 7% 12% 25% 16% 3	2470
July	1st to 10th	Day	37% 5% 19% 27% 10% 2	2329
	11th to 20th	Day	27% 6% 20% 26% 20% 2	2271
	21st to end	Day	23% 6% 23% 34% 12% 1	2405
August	1st to 10th	Day	18% 5% 17% 39% 19% 1	2314
	11th to 20th	Day	27% 6% 17% 32% 14% 4	2220
	21st to end	Day	31% 7% 18% 27% 14% 3	2239
September	1st to 10th	Day	37% 6% 10% 23% 17% 8%	1980
	11th to 20th	Day	39% 6% 12% 19% 18% 5%	1980
	21st to end	Day	30% 6% 9% 23% 18% 13%	1980
October	1st to 10th	Day	26% 4 10% 24% 23% 13%	1980
	11th to 20th	Day	33% 4 7% 17% 22% 17%	1810
	21st to end	Day	30% 3 4 16% 27% 20%	1980
November	1st to 10th	Day	38% 4 8% 19% 21% 10%	1858
	11th to 20th	Day	35% 3 9% 19% 21% 14%	1829
	21st to end	Day	42% 2 6% 16% 19% 13%	1710
December	1st to 10th	Day	40% 2 10% 18% 21% 8%	1710
	11th to 20th	Day	43% 3 7% 12% 23% 12%	2159
	21st to end	Day	37% 3 5% 15% 28% 13%	3135
January	1st to 10th	Night	37% 2 5% 17% 23% 17%	4108
	11th to 20th	Night	29% 2 4 16% 32% 17%	4120
	21st to end	Night	45% 2 4 13% 24% 11%	4462
February	1st to 10th	Night	41% 3 6% 14% 19% 17%	2280
	11th to 20th	Night	41% 3 6% 16% 20% 14%	2218
	21st to end	Night	42% 3 5% 16% 17% 16%	1865
March	1st to 10th	Night	46% 5% 7% 16% 17% 9%	3419
	11th to 20th	Night	53% 4 10% 12% 14% 8%	3480
	21st to end	Night	43% 4 9% 14% 21% 9%	3817
April	1st to 10th	Night	39% 4 8% 18% 17% 14%	2090
	11th to 20th	Night	40% 3 10% 16% 16% 15%	2046
	21st to end	Night	39% 3 8% 22% 19% 9%	1782
May	1st to 10th	Night	49% 4 8% 20% 13% 5%	2850
	11th to 20th	Night	35% 5% 11% 24% 18% 7%	2824
	21st to end	Night	37% 5% 15% 30% 11% 2	3099
June	1st to 10th	Night	20% 4 19% 30% 23% 3	1710
	11th to 20th	Night	21% 6% 15% 32% 20% 5%	1710
	21st to end	Night	26% 7% 16% 31% 17% 3	1710
July	1st to 10th	Night	28% 7% 24% 30% 10% 1	1616
	11th to 20th	Night	17% 6% 24% 33% 19% 1	1566
	21st to end	Night	16% 6% 27% 39% 10%	1673
August	1st to 10th	Night	10% 5% 25% 38% 20% 2	1601
	11th to 20th	Night	27% 7% 21% 29% 13% 3	1676
	21st to end	Night	24% 9% 22% 29% 11% 4	2114
September	1st to 10th	Night	29% 6% 17% 25% 16% 7%	1980
	11th to 20th	Night	35% 7% 15% 23% 15% 6%	1980
	21st to end	Night	29% 4 16% 22% 18% 13%	1980
October	1st to 10th	Night	22% 3 11% 27% 23% 14%	1980
	11th to 20th	Night	31% 4 7% 17% 21% 19%	2129
	21st to end	Night	29% 3 6% 18% 22% 22%	2376
November	1st to 10th	Night	32% 3 9% 20% 22% 13%	2220
	11th to 20th	Night	33% 4 8% 20% 22% 14%	2346
	21st to end	Night	41% 2 7% 17% 18% 15%	2470
December	1st to 10th	Night	38% 3 7% 22% 19% 11%	2470
	11th to 20th	Night	41% 3 5% 13% 23% 16%	3037
	21st to end	Night	36% 2 4 15% 29% 13%	4532

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% 35% 25% 8% 1	270
	11th to 20th	Day	27% 9% 26% 29% 7% 2	270
	21st to end	Day	22% 10% 36% 22% 9% 1	297
February	1st to 10th	Day	30% 10% 28% 23% 8% 1	270
	11th to 20th	Day	28% 15% 33% 20% 4 1	270
	21st to end	Day	28% 11% 42% 17% 2	225
March	1st to 10th	Day	21% 12% 36% 23% 7% 1	270
	11th to 20th	Day	20% 11% 39% 23% 6% 1	270
	21st to end	Day	19% 11% 40% 23% 6% 1	297
April	1st to 10th	Day	23% 14% 37% 20% 5% 1	270
	11th to 20th	Day	21% 11% 32% 24% 10% 1	278
	21st to end	Day	21% 8% 36% 24% 9% 2	572
May	1st to 10th	Day	20% 4 36% 29% 11%	653
	11th to 20th	Day	21% 3 26% 32% 15% 3	675
	21st to end	Day	14% 4 23% 37% 18% 4	734
June	1st to 10th	Day	7% 11% 42% 31% 8%	680
	11th to 20th	Day	7% 1 10% 48% 27% 7%	680
	21st to end	Day	5% 2 10% 34% 36% 13%	680
July	1st to 10th	Day	8% 1 5% 35% 37% 15%	642
	11th to 20th	Day	4 1 3 28% 50% 14%	618
	21st to end	Day	4 3 26% 50% 16%	684
August	1st to 10th	Day	3 1 2 24% 53% 17%	626
	11th to 20th	Day	7% 1 1 26% 47% 18%	534
	21st to end	Day	7% 1 2 20% 35% 36%	358
September	1st to 10th	Day	7% 1 18% 42% 32%	270
	11th to 20th	Day	7% 1 3 21% 43% 25%	270
	21st to end	Day	10% 1 4 22% 39% 24%	270
October	1st to 10th	Day	6% 1 11% 25% 43% 15%	270
	11th to 20th	Day	13% 3 20% 29% 26% 9%	270
	21st to end	Day	21% 9% 21% 24% 19% 6%	297
November	1st to 10th	Day	20% 4 16% 34% 19% 8%	270
	11th to 20th	Day	19% 5% 27% 28% 18% 3	270
	21st to end	Day	19% 14% 33% 21% 11% 1	270
December	1st to 10th	Day	16% 5% 32% 27% 13% 6%	270
	11th to 20th	Day	26% 11% 27% 24% 12%	270
	21st to end	Day	22% 8% 35% 25% 8% 2	297
January	1st to 10th	Night	19% 8% 31% 33% 9%	950
	11th to 20th	Night	22% 9% 28% 33% 8%	950
	21st to end	Night	21% 9% 30% 33% 7%	1001
February	1st to 10th	Night	24% 11% 31% 26% 7%	760
	11th to 20th	Night	25% 10% 36% 27% 3	744
	21st to end	Night	26% 13% 39% 19% 3	609
March	1st to 10th	Night	22% 11% 37% 27% 3	570
	11th to 20th	Night	21% 8% 35% 31% 5%	570
	21st to end	Night	15% 10% 45% 27% 4	627
April	1st to 10th	Night	16% 8% 42% 31% 3	570
	11th to 20th	Night	20% 7% 40% 29% 4	563
	21st to end	Night	17% 7% 42% 26% 8% 1	570
May	1st to 10th	Night	17% 7% 42% 28% 5% 1	570
	11th to 20th	Night	14% 3 33% 36% 13% 1	561
	21st to end	Night	14% 2 29% 40% 14% 1	617
June	1st to 10th	Night	6% 1 19% 46% 26% 1	570
	11th to 20th	Night	5% 2 26% 49% 17% 1	570
	21st to end	Night	5% 1 14% 47% 29% 5%	570
July	1st to 10th	Night	7% 2 6% 50% 32% 4	539
	11th to 20th	Night	4 7% 52% 34% 3	522
	21st to end	Night	4 6% 49% 38% 4	591
August	1st to 10th	Night	1 6% 52% 37% 4	537
	11th to 20th	Night	6% 5% 47% 36% 6%	534
	21st to end	Night	5% 1 3 36% 47% 8%	594
September	1st to 10th	Night	8% 1 5% 40% 39% 6%	540
	11th to 20th	Night	12% 1 4 35% 43% 5%	540
	21st to end	Night	10% 1 11% 38% 36% 4	540
October	1st to 10th	Night	6% 12% 48% 29% 5%	540
	11th to 20th	Night	13% 3 21% 39% 21% 2	689
	21st to end	Night	16% 5% 26% 31% 20% 2	792
November	1st to 10th	Night	14% 3 21% 40% 21% 1	740
	11th to 20th	Night	15% 5% 26% 39% 14% 1	826
	21st to end	Night	23% 6% 29% 28% 13% 1	950
December	1st to 10th	Night	22% 5% 28% 32% 12% 1	950
	11th to 20th	Night	25% 8% 26% 33% 7%	950
	21st to end	Night	21% 7% 29% 35% 7%	1045

Page generated at 2024-07-02 05:41:29. Version ac07

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