Lodi
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lodi clear sky chart from 2005-11-06 to 2026-02-16.

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	6% 3 1 4 3 3 3 2 4 5% 66%	139579
	Night	8% 4 1 4 3 3 3 3 4 5% 63%	138708
Transparency	Day	22% 3 7% 19% 25% 23%	134530
	Night	25% 4 9% 20% 23% 20%	134741
Seeing	Day	7% 5% 16% 29% 29% 14%	16856
	Night	9% 3 15% 40% 29% 4	26317

By Month

Percentage Cloud Cover SW (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	17% 8% 3 8% 5% 5% 4 4 6% 7% 34%	4737
	11th to 20th	Day	10% 6% 3 7% 7% 5% 4 3 3 6% 46%	5340
	21st to end	Day	13% 8% 3 9% 5% 5% 4 3 5% 7% 37%	5843
February	1st to 10th	Day	17% 5% 3 6% 4 5% 3 3 4 5% 44%	1890
	11th to 20th	Day	13% 7% 2 5% 4 5% 5% 3 5% 8% 44%	1938
	21st to end	Day	14% 5% 2 6% 3 3 3 3 5% 7% 49%	1650
March	1st to 10th	Day	12% 7% 3 8% 5% 5% 6% 4 7% 7% 37%	4694
	11th to 20th	Day	13% 4 2 4 3 4 4 3 5% 7% 51%	5000
	21st to end	Day	11% 6% 2 6% 4 5% 5% 4 6% 9% 42%	5677
April	1st to 10th	Day	12% 5% 2 5% 3 3 4 3 5% 7% 51%	2400
	11th to 20th	Day	8% 4 1 4 3 3 3 3 5% 6% 59%	2369
	21st to end	Day	6% 3 1 3 2 2 3 3 5% 8% 64%	2400
May	1st to 10th	Day	4 2 1 2 1 1 1 1 3 4 79%	5482
	11th to 20th	Day	2 1 2 1 1 2 2 2 4 83%	6219
	21st to end	Day	2 1 1 1 1 1 1 3 4 84%	6902
June	1st to 10th	Day	3 3 1 2 2 2 2 3 3 6% 73%	2800
	11th to 20th	Day	1 1 1 2 2 2 3 4 84%	2800
	21st to end	Day	2 1 1 1 1 1 1 2 3 86%	2800
July	1st to 10th	Day	1 1 1 1 2 95%	6319
	11th to 20th	Day	1 1 1 1 1 1 1 2 3 89%	6200
	21st to end	Day	1 1 1 1 1 1 2 3 87%	6402
August	1st to 10th	Day	1 1 1 1 1 1 1 3 4 86%	5777
	11th to 20th	Day	1 1 1 1 2 3 91%	5415
	21st to end	Day	1 1 1 1 1 1 1 2 4 85%	5984
September	1st to 10th	Day	1 1 1 1 1 1 1 2 3 88%	2400
	11th to 20th	Day	2 2 1 2 2 2 2 2 3 5% 78%	2400
	21st to end	Day	3 2 1 2 1 1 2 1 3 4 80%	2155
October	1st to 10th	Day	2 1 1 2 2 2 2 2 4 5% 78%	3280
	11th to 20th	Day	3 2 1 3 2 2 2 2 3 5% 74%	3261
	21st to end	Day	4 3 1 3 3 3 3 3 5% 7% 64%	3558
November	1st to 10th	Day	7% 4 2 5% 3 3 4 4 5% 7% 57%	1928
	11th to 20th	Day	10% 6% 2 5% 5% 3 4 3 5% 7% 49%	1890
	21st to end	Day	11% 8% 2 4 4 3 3 3 5% 8% 48%	1769
December	1st to 10th	Day	7% 5% 2 7% 4 4 5% 5% 6% 10% 45%	2700
	11th to 20th	Day	22% 10% 5% 12% 6% 5% 5% 3 5% 6% 22%	3108
	21st to end	Day	20% 9% 4 10% 6% 6% 5% 4 6% 8% 22%	4092
January	1st to 10th	Night	14% 6% 2 6% 4 4 4 4 5% 8% 41%	8155
	11th to 20th	Night	11% 5% 2 5% 4 5% 5% 3 5% 6% 49%	7650
	21st to end	Night	13% 7% 3 8% 5% 4 4 3 4 7% 43%	8371
February	1st to 10th	Night	17% 6% 2 4 3 3 3 3 4 6% 50%	2730
	11th to 20th	Night	12% 5% 2 4 4 3 3 3 5% 9% 50%	2460
	21st to end	Night	12% 4 2 4 3 3 4 3 5% 5% 54%	1980
March	1st to 10th	Night	13% 7% 3 7% 5% 3 4 4 5% 7% 42%	5183
	11th to 20th	Night	14% 5% 2 5% 3 3 3 2 4 6% 54%	5000
	21st to end	Night	14% 6% 2 5% 4 3 4 3 5% 7% 47%	5297
April	1st to 10th	Night	10% 5% 1 3 3 3 4 4 5% 7% 55%	2000
	11th to 20th	Night	7% 4 1 4 2 3 3 3 5% 6% 61%	1979
	21st to end	Night	5% 3 1 3 2 2 3 3 5% 7% 67%	2000
May	1st to 10th	Night	2 2 1 2 1 1 2 2 3 4 80%	4499
	11th to 20th	Night	2 1 1 1 2 1 1 2 2 5% 82%	3672
	21st to end	Night	1 1 1 1 1 2 1 2 3 86%	3972
June	1st to 10th	Night	3 2 1 3 1 2 2 3 3 6% 74%	1600
	11th to 20th	Night	1 1 1 1 2 1 2 4 87%	1600
	21st to end	Night	1 1 1 1 1 1 1 2 3 86%	1600
July	1st to 10th	Night	1 1 1 1 1 1 95%	3640
	11th to 20th	Night	1 1 1 1 1 1 1 2 2 89%	3748
	21st to end	Night	1 1 1 1 1 1 1 2 4 87%	4472
August	1st to 10th	Night	1 1 1 1 1 1 2 3 3 86%	4035
	11th to 20th	Night	1 1 1 1 2 93%	4453
	21st to end	Night	2 1 1 1 1 1 1 2 3 86%	5015
September	1st to 10th	Night	1 1 1 1 1 2 3 89%	2000
	11th to 20th	Night	3 2 2 2 1 2 1 2 4 81%	2000
	21st to end	Night	2 1 1 1 1 1 2 1 3 4 83%	2239
October	1st to 10th	Night	3 2 1 2 1 2 2 2 2 4 80%	3920
	11th to 20th	Night	3 2 1 2 1 2 1 2 3 5% 78%	3897
	21st to end	Night	5% 2 1 3 2 3 3 3 4 5% 69%	4253
November	1st to 10th	Night	8% 3 1 3 3 2 3 3 4 8% 62%	2590
	11th to 20th	Night	10% 4 2 5% 3 3 3 3 5% 7% 56%	2730
	21st to end	Night	11% 4 2 4 3 3 4 2 4 6% 57%	2846
December	1st to 10th	Night	8% 3 2 4 3 3 4 4 6% 6% 56%	4700
	11th to 20th	Night	19% 8% 2 7% 6% 5% 5% 4 7% 9% 27%	5316
	21st to end	Night	20% 7% 3 9% 6% 6% 5% 4 6% 7% 27%	7106

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	49% 6% 14% 21% 7% 2	4738
	11th to 20th	Day	38% 5% 7% 18% 22% 10%	5340
	21st to end	Day	45% 5% 9% 16% 21% 4	5843
February	1st to 10th	Day	42% 5% 8% 23% 16% 6%	1890
	11th to 20th	Day	39% 5% 12% 22% 18% 5%	1948
	21st to end	Day	35% 4 10% 25% 21% 5%	1650
March	1st to 10th	Day	43% 7% 9% 20% 19% 2	4694
	11th to 20th	Day	32% 5% 13% 28% 13% 8%	5000
	21st to end	Day	37% 7% 15% 27% 11% 2	5677
April	1st to 10th	Day	33% 4 12% 25% 18% 7%	2400
	11th to 20th	Day	26% 5% 12% 26% 24% 7%	2372
	21st to end	Day	20% 4 14% 30% 27% 6%	2400
May	1st to 10th	Day	12% 2 6% 29% 31% 21%	5482
	11th to 20th	Day	9% 2 5% 29% 42% 14%	6222
	21st to end	Day	7% 2 7% 28% 43% 13%	6904
June	1st to 10th	Day	14% 4 10% 27% 30% 15%	2800
	11th to 20th	Day	6% 2 6% 21% 36% 29%	2800
	21st to end	Day	7% 1 3 11% 34% 44%	2800
July	1st to 10th	Day	2 1 6% 19% 72%	6251
	11th to 20th	Day	5% 1 2 5% 13% 75%	6125
	21st to end	Day	6% 1 3 13% 31% 46%	6217
August	1st to 10th	Day	8% 1 2 7% 26% 56%	4206
	11th to 20th	Day	4 1 2 7% 40% 46%	3919
	21st to end	Day	6% 1 3 9% 38% 43%	4311
September	1st to 10th	Day	5% 1 3 11% 29% 51%	2400
	11th to 20th	Day	11% 1 6% 22% 39% 22%	2400
	21st to end	Day	11% 2 4 19% 36% 28%	2155
October	1st to 10th	Day	10% 2 4 12% 28% 43%	3280
	11th to 20th	Day	14% 3 6% 24% 35% 18%	3261
	21st to end	Day	20% 4 7% 20% 36% 13%	3558
November	1st to 10th	Day	26% 5% 10% 26% 25% 8%	1928
	11th to 20th	Day	34% 6% 12% 25% 19% 3	1890
	21st to end	Day	36% 4 11% 24% 19% 6%	1769
December	1st to 10th	Day	33% 5% 14% 28% 16% 4	2700
	11th to 20th	Day	62% 4 9% 14% 9% 2	3108
	21st to end	Day	58% 8% 13% 13% 6% 1	4092
January	1st to 10th	Night	40% 7% 17% 25% 8% 3	8155
	11th to 20th	Night	32% 4 10% 19% 26% 9%	7650
	21st to end	Night	42% 4 9% 18% 20% 7%	8371
February	1st to 10th	Night	37% 3 8% 22% 21% 8%	2730
	11th to 20th	Night	32% 5% 11% 24% 22% 6%	2461
	21st to end	Night	31% 4 11% 26% 22% 6%	1980
March	1st to 10th	Night	40% 7% 11% 18% 20% 3	5183
	11th to 20th	Night	34% 5% 13% 24% 15% 9%	5000
	21st to end	Night	36% 6% 15% 25% 14% 3	5297
April	1st to 10th	Night	29% 5% 12% 24% 22% 8%	2000
	11th to 20th	Night	24% 5% 12% 28% 20% 11%	1979
	21st to end	Night	18% 4 13% 30% 28% 6%	2000
May	1st to 10th	Night	10% 3 9% 26% 31% 20%	4496
	11th to 20th	Night	9% 2 7% 29% 40% 14%	3672
	21st to end	Night	7% 2 6% 31% 43% 11%	3972
June	1st to 10th	Night	13% 4 10% 28% 32% 13%	1600
	11th to 20th	Night	5% 2 6% 19% 37% 30%	1600
	21st to end	Night	6% 2 2 13% 31% 45%	1600
July	1st to 10th	Night	2 1 1 5% 20% 71%	3600
	11th to 20th	Night	5% 1 2 4 13% 75%	3700
	21st to end	Night	6% 1 2 16% 28% 47%	4345
August	1st to 10th	Night	9% 2 2 8% 26% 54%	2929
	11th to 20th	Night	4 1 2 7% 37% 49%	3216
	21st to end	Night	6% 1 3 9% 34% 48%	3608
September	1st to 10th	Night	4 1 3 10% 30% 52%	2000
	11th to 20th	Night	10% 3 5% 21% 37% 25%	2000
	21st to end	Night	8% 2 4 19% 35% 32%	2239
October	1st to 10th	Night	11% 2 4 11% 20% 52%	3920
	11th to 20th	Night	12% 2 6% 28% 30% 22%	3897
	21st to end	Night	18% 3 6% 20% 33% 20%	4253
November	1st to 10th	Night	22% 4 11% 25% 24% 14%	2590
	11th to 20th	Night	28% 4 10% 26% 25% 7%	2730
	21st to end	Night	30% 4 9% 23% 26% 9%	2846
December	1st to 10th	Night	27% 5% 11% 27% 22% 8%	4700
	11th to 20th	Night	51% 6% 11% 17% 11% 3	5316
	21st to end	Night	54% 8% 13% 15% 7% 2	7106

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% 7% 15% 24% 17% 7%	222
	11th to 20th	Day	17% 6% 14% 22% 26% 16%	430
	21st to end	Day	14% 5% 15% 25% 25% 15%	473
February	1st to 10th	Day	19% 7% 17% 20% 22% 16%	430
	11th to 20th	Day	14% 8% 26% 23% 17% 12%	483
	21st to end	Day	12% 10% 20% 26% 25% 8%	414
March	1st to 10th	Day	17% 10% 19% 29% 19% 6%	500
	11th to 20th	Day	18% 9% 20% 22% 19% 12%	500
	21st to end	Day	14% 9% 24% 26% 19% 8%	550
April	1st to 10th	Day	15% 7% 22% 28% 17% 10%	500
	11th to 20th	Day	9% 8% 25% 28% 20% 11%	492
	21st to end	Day	7% 6% 22% 29% 23% 13%	500
May	1st to 10th	Day	5% 7% 27% 29% 22% 10%	503
	11th to 20th	Day	4 6% 26% 27% 27% 11%	528
	21st to end	Day	3 5% 17% 29% 33% 13%	573
June	1st to 10th	Day	3 5% 20% 32% 29% 11%	530
	11th to 20th	Day	1 5% 21% 38% 29% 7%	530
	21st to end	Day	1 3 16% 32% 35% 14%	530
July	1st to 10th	Day	1 1 12% 38% 39% 11%	526
	11th to 20th	Day	1 8% 33% 47% 11%	524
	21st to end	Day	1 1 8% 37% 40% 14%	575
August	1st to 10th	Day	2 1 11% 37% 35% 14%	527
	11th to 20th	Day	1 1 13% 33% 37% 14%	517
	21st to end	Day	1 1 7% 36% 40% 15%	583
September	1st to 10th	Day	1 2 9% 34% 38% 15%	530
	11th to 20th	Day	2 2 16% 32% 30% 18%	530
	21st to end	Day	2 3 12% 31% 32% 20%	530
October	1st to 10th	Day	3 3 16% 24% 29% 24%	530
	11th to 20th	Day	5% 5% 12% 21% 30% 27%	530
	21st to end	Day	8% 4 13% 22% 32% 21%	583
November	1st to 10th	Day	7% 5% 14% 22% 28% 25%	404
	11th to 20th	Day	11% 5% 16% 26% 28% 14%	330
	21st to end	Day	12% 1 12% 29% 33% 13%	267
December	1st to 10th	Day	16% 4 12% 25% 26% 17%	220
	11th to 20th	Day	17% 6% 16% 20% 27% 13%	220
	21st to end	Day	20% 8% 17% 29% 21% 5%	242
January	1st to 10th	Night	18% 5% 16% 33% 23% 5%	840
	11th to 20th	Night	13% 4 13% 37% 28% 5%	840
	21st to end	Night	16% 3 13% 37% 26% 5%	924
February	1st to 10th	Night	19% 4 14% 37% 23% 3	840
	11th to 20th	Night	14% 5% 18% 35% 25% 3	804
	21st to end	Night	12% 5% 20% 42% 18% 3	660
March	1st to 10th	Night	16% 6% 21% 33% 23% 2	800
	11th to 20th	Night	15% 7% 19% 36% 22% 2	800
	21st to end	Night	14% 5% 22% 38% 20% 1	880
April	1st to 10th	Night	11% 4 24% 38% 22% 1	800
	11th to 20th	Night	6% 6% 27% 37% 20% 3	791
	21st to end	Night	6% 3 24% 41% 25% 2	800
May	1st to 10th	Night	3 3 26% 43% 22% 3	778
	11th to 20th	Night	4 1 17% 47% 29% 1	424
	21st to end	Night	3 2 21% 45% 28%	433
June	1st to 10th	Night	4 2 19% 52% 24% 1	400
	11th to 20th	Night	1 1 20% 51% 26%	400
	21st to end	Night	1 1 13% 54% 31% 1	400
July	1st to 10th	Night	8% 55% 35% 1	390
	11th to 20th	Night	1 7% 52% 38% 1	431
	21st to end	Night	1 4 44% 47% 2	657
August	1st to 10th	Night	1 1 7% 44% 44% 3	597
	11th to 20th	Night	12% 49% 36% 3	764
	21st to end	Night	2 7% 49% 41% 2	880
September	1st to 10th	Night	1 1 10% 47% 41% 2	800
	11th to 20th	Night	3 2 13% 43% 35% 5%	800
	21st to end	Night	2 1 13% 41% 37% 6%	800
October	1st to 10th	Night	4 3 12% 43% 31% 8%	800
	11th to 20th	Night	5% 4 13% 36% 37% 6%	800
	21st to end	Night	5% 4 10% 38% 34% 9%	880
November	1st to 10th	Night	7% 2 14% 37% 33% 7%	820
	11th to 20th	Night	11% 2 12% 42% 29% 4	840
	21st to end	Night	11% 3 14% 38% 30% 5%	840
December	1st to 10th	Night	14% 3 13% 39% 25% 7%	840
	11th to 20th	Night	22% 3 13% 34% 24% 4	840
	21st to end	Night	21% 6% 17% 34% 20% 1	924

Page generated at 2026-02-12 22:42:13. Version ac07

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